Attention eBay sellers and buyers: No matter WHAT the model tag says, no HT600, HT600E, HT800, MT1000 or P200 will ever do the entire 30-50 MHz, 136-174 MHz, or 406-470 MHz frequency range listed on its model tag / label.   See additional information in the section titled "Frequency Bands, Ranges and Splits" below.

The Motorola Genesis line of hand-held radios includes the HT600, HT600E, HT800, the MT1000, the MTX, the MTX "Classic", the MTX800 (800mhz), the MTX810, the MTX900 (900mhz) and the P200 radios plus the matching accessories (note that Moto Marketing pulled a very bad move - they named both a Genesis-series and a Waris-series with the name MTX900. The two radios are very, very different). The HT600E radio is a European version of a MT1000 - all they did was change the label and customize the RSS programming software to European requirements (but the MT1000 RSS works just fine). The HT800, if my source is correct, is an 8 or 16-channel MT1000 with a 5 Tone decoder added (radio paging tones). As far as we know the MTX, the "Classic", the MTX800, the MTX810, and MTX900 radios are all 800MHz and 900MHz - at this time we have no data on them.
One Caution: The HT600 and MT1000 radios are 12v, some of the MTX and "Classic" radios are 10vDC (and are labeled as such on the model tag).

When Moto decided to sell radios through retail outlets under the Radius name they took the HT600 and MT1000, changed the color of the plastic to black, and slapped a P200 label on it - under the covers the high band and UHF P200s are pure HT600. The low band P200 is an MT1000 inside.

All HT600 / MT1000 / HT600E / P200 models are wideband.

Missing info: (contributions of information are welcome!)
1) MTX800, MTX810, MTX900, "Classic" radio information
2) Will the MTX900 go to 902/927MHz amateur radio channels? If so, how?

Models and Specifications:

HT600:
As far as I know the HT600 was the first radio in the Genesis series and did not come in a low band model. The later MT1000 had more memory in the microprocessor based control board, offered up to 99 channels, MDC, and low band models were available.
HT600 VHF Specifications page     HT600 UHF Specifications page

Sample model number: H43SVU-7160BN
H	4	3	SVU
Radio Type	Transmit Power [1]	Frequency Range	Product Line
H Hand- held Z Special Product	3 136-174 MHz: 2 Watts 403-470 MHz: 2 Watts	3 136-174 MHz in 3 ranges [2]	SVU HT600
	4 136-174 MHz: 5 Watts 403-520 MHz: 4 Watts	4 403-520 MHz in 4 ranges [2]

Sample model number: H43SVU-7160BN
7	1	6	0	C	N
Squelch	Channel Spacing	Channels	Variation	Issue [4]	Packaging [5]
7 PL or DPL	0 Wideband [3]	2 2 channels	0	A [6]	(blank) (bare radio)
	1 Narrowband [3]	6 6 channels [7]		B	C Alkaline
				C	N Nickel- Cadmium [1]

Notes: All of the HT600s I've seen were either 7120 or 7160 models.
1) The 2 watt radios were shipped with the NTN4548B "Medium capacity" battery, and the 4 watt/5 watt radios were shipped with the NTN5414B "high capacity" battery.
2) The ranges, according to the RSS, are: 136-151, 146-162, 157-174, 403-433, 438-470, 470-500, 488-520.
3) This is the 1980s / 1990s definition of wideband and narrowband... a wideband radio is VERY rare and is 30 kHz channel spacing on high band, 50 khz spacing on UHF, narrow equals 20 khz spacing on low band, 15 kHz channel spacing on high band, 25 khz spacing on UHF. At the time these were in production there was some wideband still in use in the radio and TV field reporter-to-studio channels where fidelity would count. Personally, I've never seen a wideband HT600.
4) Another name for "hardware version".
5) This describes how the radio was originally packaged or shipped, and with what accessory kit. A warranty replacement was a bare radio in a plastic bag in a cardboard box - no antenna, no battery, no users manual, etc. A "C" or an "N" was a complete radio, the only difference was the typr of battery that was shipped.
6) I've never seen an "A" series HT600. Almost all high band radios were "B" series, almost all UHF were "C" series.
7) The only difference between a 7120 and a 7160 was a physical rotational stop on the frequency switch and the contents of the codeplug.

MT1000 / HT600E:
As said above the HT600E radio is basically a relabeled MT1000 with some variations in the RSS. The MT1000 RSS works just fine on it. Around mid-2006 a large number of HT600E UHF radios were surplused by the UK national police forces. These were 2 watt UHF 99 channel Z34GCJ-7190 radios that except for the HT600E escutcheon are identical to the MT1000. All of the HT600 and MT1000 accessories, including batteries work just fine. Some of them had an encryption board designed by Marconi Secure Communications division installed inside the radio (MSC was pronounced "mask" and the option board became known as "the MASC board"). The Z as a first letter (rather than an H) signifies a "Special Production" model, and I do not know what the exact differences were other than the MASC board and the large capacity battery shipped with a low power radio. I would very much like to see some literature describing these UK "Z" radios.

Supposedly the MASC system was developed by the Marconi Secure Radio group, and after MSR was shut down the products, including MASC, were transferred to the Marconi Secure Systems division. The focus of the Secure Systems operation was computer network security, not radio. This situation became worse when the Marconi parent company was sold and split. Secure Systems ended up with the new Marconi Company, which was basically a telecoms and internet company. That was the end of MASC.

There is very little information on the HT600E on the USA side of the Atlantic, and I was surprised when this file showed up in my email... HT600E Service Manual 68P81050C45-O. This is a 21 page PDF that is 2.15 MB in size.

There were a number of 136-151 MHz 16-channel ACH33GCU7100AN radios surplused recently from the Canadian public safety services. The leading "AC" indicates Canadian manufacture. Despite the label being a "33" they are supposedly "43" series inside and are ideal for the 2M amateur band.

Based on the old Buyer's Guides I beleve that the MT1000 was like the HT600 in that the 2 watt radios were shipped with the NTN4548B "Medium capacity" battery, and the 4 watt / 5 watt radios were shipped with the NTN5414B "high capacity" battery.

Sample model number: H44GCJ-7190CN
H	4	3	GC	J
Radio Type	Transmit Power	Frequency Range	Product Line	Display
H Hand- held Z Special Product	3 Not used on low band 136-174 MHz: 2 Watts 403-470 MHz: 2 Watts	1 30-50 MHz	GC HT800 / MT1000 / HT600E	J Digital Display (32 or 99 Chanels)
	4 30-50 MHz: 5 or 6 Watts [1] 136-174 MHz: 5 Watts 403-520 MHz: 4 Watts	3 136- 174 MHz	RF Radius P200	U No Display (Has the Rotary Channel Selector)
		4 403- 520 MHz		R ??? Unknown ??? Seen on a 16 channel GCR high band radio [2]

Sample model number: H44GCJ-7190CN
7	1	9	0	C	N
Squelch	Channel Spacing	Channels	Variation	Issue [4]	Packaging [5]
7 PL or DPL	0 Wideband [3]	0 16 channels	0	A [6]	(blank) (bare radio)
	1 Narrowband [3]	2 2 channels		B	C Alkaline
		3 32 channels [7]		C	N Nickel- Cadmium [8]
		6 6 channels
		8 8 channels
		9 99 channels

Notes:
1) Some books say 6 watts, some say 5.
2) The single H43GCR7100CN that I have seen had factory DTMF, and that may be significant, or maybe not. And no, it wasn't a ding or scratch on the serial plate, it was a real GCR. Or it may have been a factory typographical error (and it wouldn't be the first one I've seen).
3) See the wideband/narrowband notes on the HT600 above.
4) Another name for "hardware version"
5) Same as the HT600
6) The A-series radios were not compatible with the enhanced MVA.
7) Notes from an email: The 32 channel MT is a very rare configuration. I've only seen a few 7130s, and they were all low band ones, and the only one I was able to get on the programming bench was in reality a 99-channel radio with a 32 channel model tag (it had a 99-channel control board in it). If you find a 7130 in surplus it may actually be a 7190 inside, or it may be a true 32 channel radio. You won't know until you try and program the higher numbered channels. And if you do find a true 32 channel one, I'd like to know the part number of the control board.
8) The 2 watt radios were shipped with the NTN4548B "Medium capacity" battery, and the 4 watt/5 watt radios were shipped with the NTN5414B "high capacity" battery.

Missing info: (contributions of information are more than welcome)
1) Photos of each of the RF boards and each of the controller boards.
2) Model chart or info, specs and photos of the P200, HT800, the MTX, MTX800, Classic and MTX900... Anybody want to donate or loan a manual or at least scan some pages?
3) Any details on how the presence of the MDC or DTMF options affected the model number
4) Contact info for anyone who can replace the top contact set on the MT1000s/HT600Es (i.e. the accessory connector)

Radius P200:
The UHF and high band P200 radio is basically an HT600 in a black plastic case with a Radius escutcheon. Likewise the low band P200 is a relabeled MT1000. The RSS was tweaked for both. Some people have had good luck using the HT600 RSS on the UHF and high band ones, and the MT1000 RSS on the low band ones (and if you have the HT600 or MT1000 RSS it doesn't hurt to try reading the radio. If it doesn't work, well, it doesn't work and you will have to acquire the Radius RSS).

Accessories Common to All Genesis Radios:

The top of the radio has the "Universal" connector (at least that's what Moto marketing called it), also called the accessory or option connector. While the drawing below is of a 6 chanel HT600 the pinout is the same across the entire Genesis product line:

1	External microphone hot.	8	Speaker Return - See note 2 below.
2	External speaker hot - See note 2 below.	9	Busy (for programming and for MVA mode).
3	This is called "Option B+" in the book. It's the switched battery voltage through 560 ohms.	10	Remote Antenna (i.e. the center of the coax and pin 12 has the shield).
4	Push To Talk - ground to transmit.	11	CVC Sense - See note 1 below.
5	Ground	12	RF Ground (used by the MVA and the antenna adapter).
6	Serial data (bidirectional - for programming and for MVA mode).	13	"Sense" or "Remote RF Select" See notes 3 and 4 below.
7	External Speaker Select - Grounded by the earphone adapter or the MVA to switch from the internal speaker to pins 2 and 8. See note 3 below.

Note 1: CVC="Convert-A-Com", the old name for the Mobile Vehicular Adapter (see below). When the CVC pin is grounded by the MVA the microprocessor in the radio goes into "MVA mode" and communicates with the microprocessor in the enhanced MVA (the NTN5613 series) over the bidirectional programming data pin at 9600 baud. This allows the MVA channel display, open squelch LED, etc. to stay in lock step with the radio. This fuctionality was added to the firmware in the "B" series and later radios.

Note 2: The Genesis series uses a weird audio output chip with three ouput pins. Despite both the block diagram and the schematic in the book indicating differently, two of the pins are the same phase and the third pin is inverted and all three are floating above ground. The internal speaker (which is 39 ohms) sits between the inverted output and one of the noninverted ones, and the external speaker-mic uses the inverted and the other noninverted. Again, do NOT let any audio output lead contact ground or you will be buying and installing a new U406 Audio PA module, and while I haven't checked, it's probably not available. One of my radios has a dead speaker output pin and someone along the line disconnected the speaker-mic connection and jumpered the speaker-mic output to the internal speaker. Note that this floating speaker design requires a 1:1 audio transformer between the radio and any test equipment that connects to the speaker leads (like when doing a receiver quieting measurment)....

Note 3: The switching is done electronically (no reed relays here!) and depends on a good hard ground. If you make up your own adapter make sure that the switching has no significant series resistance in either pin 7 or pin 11.

Note 4: Motorola calls pin 13 "Sense" in the earlier MT1000 manuals, but a better name would be "External Antenna Select". This pin is grounded by either the MVA or by the external antenna adapter to switch the radio antenna connection from the screw-in antenna mount in the top of the radio to pins 10 and 12 on the connector. The last version of the manual uses the term "Remote RF select".

The five photos below show, in the first row, WA1MIK's HT600 (6-channel) radio with a dust cover, an 8-channel MT1000 and a 6-channel "Classic" (with a broken channel knob, more on that later). The second row has a friend's 16-channel radio (also with a broken channel knob), and my personal 99-channel UHF HT600E radio with a dust cover. Depending on the radio series, the mini-toggle switch in the top left corner has either two or three positions. Look at the top left photo below: the left position has the line through the speaker signifying PL Receive mode, the the right position has the un-slashed speaker symbol which signifies carrier squelch mode. The conventional radios with the three-position toggle switches have the left position as PL mode, the center position as carrier mode, and the right position as scan mode (indicated with a stylized "Z" symbol). The 800 MHz trunking radio has different assignments for the switch.

   
 
The 99 channel radios have two small LEDs, where the other radios have a single two-color LED.

The 99-channel display radios have a cute trick in the firmware - if "manual display flip" is enabled in the RSS you can "flip" the display orientation so that it reads correctly when you are looking at it in your hand or on your belt. All you have to do is press and hold the two channel direction buttons simultaneously for a couple of seconds. Do the same again and it will flip back. I've never seen a 99-channel Genesis that didn't have that feature enabled.

The RF boards are the same between the "rotary" models and the "display" models, and the control boards are such that an 8-channel can be converted into a 16 channel, but the internals of the radios are different enough that it is impractical to attempt to upgrade any rotary model to a 99-channel display model.

One of the options on the Genesis was the so-called "man down" button. It's an obnoxious orange button that has a stiff spring under it to help prevent accidental activation. When it is pressed the microprocessor keys the radio and sends an alert signal on a specific channel (regardless of the current position on the channel selector on the radio). As an aside, the nameplates/escutcheons (i.e. "Motorola MT1000") for the "man down" fronts are a different shape and hence are unique to those fronts. You can trim a standard one down with a new fresh single edge razor blade or a surgical scalpel and a ruler... it will look somewhat presentable, but it's rather difficult. Best to find a proper one if you can.
Here's two photos of a MT1000 with the "man down" option... note how the top protrudes to make the button easy to find by feel... The orange color in the right photo is faded and way off color anyway (another indication is that the gold pins are more yellow than gold), the "real" color is much more like the left hand photo.
 

Missing info: (contributions of information are welcome!)
A better photo of a man-down button faceplate.
A digital photo of the component side of a man down faceplate.

Accessories:

Unfortunately you can only use one accessory at a time... The available toys include:

• 0102706J99 Motorola refers to this item as "Cover, Dust". It's the protective cap for the accessory connector and is visible in one of the pictures above. If you are going to order one, make sure you get the matching screw to go with it - it's part number 0305103S01 called a "Screw, Captive". Sorry, but none of the usual suspects had a single assembly number for both the cap and the screw.
• NTN5368A RF Adapter and the NKN6408A cable. Click here for a schematic of the NTN5368A. Note that eBay sellers unfamiliar with these radios frequently sell this item as the identical-looking earphone adapter. The quick tip-off is the antenna symbol to the top right of the screw head (which eventually wears off). Fortunately the part number is underneath and protected so once you have both part numbers you can tell them apart. Another trick is to look at where the pins are installed in the bottom - the RF adapter has all its pins on the 4-pin side, the earphone adapter has all its pins on the 9-pin side. The next two photos are by WA1MIK.
  
  
  
  The "MAL 9142" indicates that the one in the photo was made in the 42nd week of 1991, and in Malaysia.
  One of the three pins on the accessory connector is the external RF connection, one is ground, and the third pin is switched to ground (by inserting the 1/8 inch plug) to accomplish the changeover of the antenna connection away from the radios built in antenna and over to the 1/8 inch (3.5mm) earphone style jack on top of the adapter. The switching is done in a clever fashion: the jack is a stereo jack (i.e. tip, ring, shorter sleeve), but the plug is monophonic (tip, longer sleeve). When the plug is inserted, the longer sleeve grounds the ring terminal which is connected to pin 13 which switches the RF board antenna connection from the radio's antenna connector to pin 10 of the accessory connector.
  Now, the problems with this unit: The adapter is made of plastic. Despite the shielded connection shown in the schematic, the wiring inside is just common hookup wire. Nothing is shielded. The NKN6408 cable isn't much better as the shell of the 1/8 inch (3.5mm) plug is plastic. While you can use this combination for measuring output power and sensitivity, don't count on it to give you a nice quiet, shielded environment for testing purposes. A dummy load attached to this cable will radiate about as much as an antenna. There's so much signal leakage that you'd think you've still got the rubber ducky antenna working. Overall it's a good idea, but poorly implemented.
  More than one has been modified by replacing the 1/8 inch jack with a BNC, grounding the changeover lead, and adding some copper foil inside the plastic shell. I've seen two where the owners skipped the BNC and one wired a length of RG400 coax right to the pins in the connector (plus he used the foil), the other used RG-174 and the foil.
  

  ---

  IMPORTANT
  Look at these photos: The Genesis antenna bushing has a has a solid antenna ring, hot to RF, on top.		Other radios, like this GP68, have a hot recessed center and a grounded outer ring.		Yes, the antennas made for them will work
  While the antenna adapters from the other radios will screw into the top of your Genesis, they will not work!!! People think that just because antennas from other radios happen to fit a Genesis radio (Motorola has used the 1/4 inch diameter by 32 threads per inch antenna fitting for years) that the antenna adapters will as well. WRONG !!! Note how the MT1000 (in the left photo) has the antenna ring fully hot. Many other radios, including the GP68 in the center and right-hand photos have a grounded ring around the hot antenna center bushing. The antenna adapters for those antennas depend on that grounded ring. The Genesis antenna adapter gets its ground (and depends on it) from the accessory connector. If you put one of those other antena adapters on a Genesis then plug in a coaxial antenna cable into the adapter you will find that both sides (i.e. the center conductor and the shield) will be hot to RF (radiating). This mismatch will generate high SWR which will eventually damage the Genesis radios transmitter.

  ---

• The NKN6408A cable is nothing more than a 1/8 inch (3.5mm) plug, a length of thin coax (RG-174/U style), and a hooded SO-239 connector. The three I've seen were all delivered with a hard plastic shell on the plug, and phenolic SO-239 connectors. If you have one you will sooner or later need to replace the plug, especially if you accidentally step on the plug. Do yourself a favor and while you have the plug off and it's missing add some thick heat shrink up around the neck of the SO-239 shell (or if all you have is the thin stuff use two layers). The intent is to strengthen the cable around the entrance of the connector hood and prevent the extremes of any flexing at that point. When you reinstall the mini-plug use one with a metal hood and put some heat shrink around the back of the plug shell.
  Here's a photo (courtesy of WA1MIK) of a late version NKN6408A cable with factory heatshrink on the neck of the SO239 shroud and on the mini-plug, but the plug shell is still plastic.
  
• NTN4812B Earphone Jack Adapter (a 1/8 inch (3.5mm) miniature headphone jack). Click here for a schematic of the NTN4812B. This adapter looks identical to the RF adapter and the only way to tell them apart is by the symbol stamped on the top (which eventually wears off), the pin locations (i.e. where they are installed in the bottom) and the part number. In fact, it's not hard to convert one into the other as both units are held together with one screw, and neither is potted inside. The switching between the internal speaker and the external speaker is done in the same fashion as the RF adapter above. This adapter cannot be used with an external speaker listed below without bypassing the internal 820 ohm resistor. More than one person has relocated the resistor from inside the adapter to inside the earphone. Here's a photo of the earphone adapter and the "official" Moto earphone of the era - the NTN5043A.
  

  This photo (courtesy of Dennis Hicks KG6OMR) shows the bottom of the audio adapter - note that the three pins are on the left side where on the RF adapter the three pins are on the right.
  

• One item I'd like to get a photo of (and the manual for) is the "Universal Accessory Adapter", part number NTN5560C. This option adapts the radio's accessory connector on top to a minature rugged 6 pin circular connector for various other accessories. Some folks call it a "HiRose" or "Hirose" connector.

Speaker-Microphones:

An NMN6145B Speaker-Mic

An NTN5050A Public Safety Speaker-Mic. New price on this unit was about $115 (less the screw-in antenna) Does anyone know who makes the bulk cable for these units?

All of the public safety speaker/microphones use a thicker straight cord rather than a curly cord due to the fact that there is an antenna coax inside the cable jacket. That coax feeds the antenna connector that is mounted into the top of the speaker-microphone.

Two points about the straight-cord public safety speaker mics (also called PS speaker mics):

• DO NOT USE a public safety speaker-microphone without the antenna in place as the RF is switched from the normal antenna to the to the antenna on the top of the mic. If the antenna is not there you WILL damage the transmitter. If you have to use one in that fashion then put a piece of black tape over pin 13 on the accessory connector to force the radio to use the antenna on the radio.
• DO NOT USE a public safety speaker-microphone on a high band radio. They were designed for UHF only, and will provide a rotten match (i.e. high SWR) at VHF, even with a proper range VHF flexible antenna.

• 8505355K03 Public Safety Speaker/Microphone Antenna, 400-430 MHz
• 8505355K04 Public Safety Speaker/Microphone Antenna, 440-470 MHz
• 8505309N11 Public Safety Speaker/Microphone Antenna, 470-512 MHz

• NTN5050A Public Safety Remote Speaker/Microphone with Velcro Back - (requires an antenna from the list above and the NLN8410A velcro patch)
• NTN5493A Public Safety Remote Speaker/Microphone with clip (requires an antenna from the list above)
• NTN5881A Public Safety Remote Speaker/Microphone with 2.5mm Earphone Jack (requires an antenna from the list above)
• NMN6127C Remote Speaker/Microphone with Clip and Coil Cord
  This uses the same style microphone as the NTN6145, and the radio plug is similar but does not have the earphone jack. The schematic of this one will be close to, if not identical to, the NMN6155A or NMN6156B listed below.
• NMN6145B Remote Speaker/Microphone with Clip, Clip Cord and 2.5 mm Earphone Jack   Click here for a schematic of the NMN6145B. As shown in the photo above the earphone jack is on the radio connector, not on the speaker-mic (look for the flat metal object next to the captive screw - that's the jack).
• NTN6155 Remote Speaker/Microphone with Clip and Coil Cord  - This was a cost-reduced version of the 6145 that had no earphone jack (see photo below), and the back of the microphone had a velcro patch instead of a clip. It required the NLN8410A velcro patch. Click here for a schematic of the NMN6155A
• NMN6156B Remote Speaker/Microphone with Clip and Coil Cord Click here for a schematic of the NMN6156B.

Here's a photo of the NTN6155 series on a radio. As you can see there is no earphone jack. This photo also shows you why the frequency knob is so tall - when you add any accessory, especially a speaker-mic, you can't reach a standard height knob. Even with the very tall frequency knob it's still crowded. This is one reason that the connector was moved to the side on the follow-up radio series - the Jedi (HT1000, MT2000, etc).

Some folks trim the height of the channel knob, either with a hacksaw, or a pair of diagonal cutters and a file to clean up the sharp edge... or sometimes they get bumped and just break off. I've used the radio on the right, and the knob is just tall enough that you can easily rotate it, however it's short enough that you can't rotate it by accident. In other words, the knob is short enough above the radio that it's the one you give the newbie at a public service event where you don't want him changing channels by an accidental bump.

BTW, I've seen a tiny 4x4 DTMF pad mounted to the back of an oversize speaker-mic originally intended for another radio and rewired to a Genesis speaker-mic cable.

Here's a service hint on Genesis speaker-mics: Look at any of the schematic links below. There is a 9v zener diode across the microphone cartridge, labeled VR1. If it's shorted you will have almost no transmit audio. If it's open the audio can be loud and "fuzzy", or if the overvoltage blows the mic element (sometimes it does, sometimes it doesn't) there can be no audio. So if you have a speaker-mic that has bad audio or no audio, first test the zener before you replace the cartridge. You don't want to damage the new cartridge due to an open zener.

Another service bench hint: Take an old public safety speaker / microphone and take the speaker-microphone head off of the cord. Add a female crimp-on RF connector to the coax stub, and a DB-connector to the other wires. You can solder a mini-toggle switch across the PTT and Ground leads, and on other pins you can inject audio into the microphone circuit for transmitter testing, or sense audio for SINAD / quieting testing, etc., i.e. a poor-man's RTX test set. Just remember to put a 1:1 audio isolation transformer on the radio audio output so that neither speaker lead ever gets grounded. The "real" RTX also has a 1:1 audio isolation transformer and a 10:1 resistive divider from the audio input (i.e. where an outside audio oscillator outputs 450mv and the level to the radio is 45mv). Due to the poor construction of the adapter you will need to use a screen room, or to at least take the plug on the radio end of the cable apart and glue copper foil inside the plastic shell, and ground it.

Part Numbers:
The non-public safety microphone cord is part number is 0105959R75 and it will set you back about $90 plus shipping (2006 price).

Missing info: (contributions of information are welcome!)
1) Anybody have the part number for the replacement cord for the public safety speaker/microphones?
2) Anybody have a photo of the the matching NTN5560C HiRose adapter ?
3) Anybody have the part number of the HiRose connector speakermic ?
4) Anybody have a photo of any of the surveilance / undercover / covert kits ?

PL and DPL:

The HT600 radio has a 6 position switch, and hence can have a maximum of 6 RF channels but is only capable of four coding schemes that are shared among all channels. You can NOT have six completely different combinations. I don't know if the limitation is in the radio or the RSS, but it doesn't tell you during programming; things just don't work like you'd expect. According to the RSS manual, the available combinations are:
(1) one tone PL, one DPL, one quickcall
(2) two tone PLs, one DPL
(3) three tone PLs, one DPL
(4) one tone PL, three DPLs.
It would have been nice to have another option of four tone PLs, but Moto engineering decided nobody would ever need that. If someone wants to do some investigating where the limitation(s) is/are and let us know, I'll update this paragraph. If the limitation is in the RSS and someone develops a RSS patch that works please do a how-to article (see the GTX section for an example patching procedure article).

The MT1000 / HT600E radios come stock with all common PL and DPLs in them, and the radio can do split and mixed tones/codes/carrier on a per channel basis... HOWEVER there are only thirty "slots" for the tone/DPL code information, and the slots have to be programmed BEFORE you program the RF frequency information. The simplest way is to make up a spreadsheet of the receive frequency, receive tone, transmit frequency, transmit tone, etc. and then count how many tone/DPL combinations you need, and pray that it's thirty or less. Then program the PL/DPL page in the RSS, then program the RF frequency information. I learned this the hard way, as I skipped 77.0 HZ as I programmed the tone/DPL table, and had to go back and verify every bit and reprogram most of the PL/DPL information in a 99 channel radio that had 81 channels in it.

Note that there is no "MPL" feature like on later radios, if you want the option of changing tones on the same RF channel you will have to program multiple channel slots with duplicate RF information and different tones/DPLs (this is one reason the 99 channel radios are so popular).

DTMF:

The DTMF is fully contained in the front cover of a Genesis radio. Adding DTMF to a non-DTMF radio consists of swapping the cover and reprogramming the radio so that the main microprocessor "knows" that it's there. Swapping a front cover on a Genesis radio is a 15-20 minute job the first time you do it and less than half that the next time. There were at least four DTMF front covers made for the Genesis line. All of the DTMF fronts I've seen are 12-button, as far as I know there never was a 16-button DTMF option in ANY stock Moto radio until the GP68 series was introduced.

Here are photos of two of the known fronts, the left hand photo is of an NTN4627B front, the center photo shown an NTN5596A, and the right photo is a plain front radio. There were also the NTN5040A and the NTN5395A fronts. The tiny button to the top left of the "1" key in the photos is used to program DTMF strings in to the DTMF chip memory... The programming clip uses a magnet to trigger the Hall Effect sensor in the faceplate. Programming details are in the user's guide. One note: DTMF and the orange "man down" panic button on the same front panel was an available combination but is almost impossible to find. If you ever pick up a radio that has that combination, be assured that finding a replacement front will be next to impossible.

This NTN4627B front came with an HT600 escutcheon. The NTN5215 looks the same. Photo by WA1MIK.

The NTN5596A has a different physical layout. The NTN7910A looks the same.

A "plain front" radio for comparison.

To swap a front panel, just remove the battery, then remove the two screws on the radio back and the two on the bottom front. There are four perimeter screws plus three screw on the battery contacts. Remove the two small ones that mount it to the front cover and loosen the other two perimeter screws one turn. See below:
  Photo by WA1MIK.

Once the plate is loose use your fingertips to GENTLY wiggle the front off. You will see a small white connector. GENTLY unplug it applying as little strain to the wiring as possible. Once in your hand it will look like this (DTMF photos by WA1MIK):

A rear view of the NTN4627B.

A rear view of the NTN5215A.

A rear view of the NTN5596A.

This is a plain front hence the very few wires in the connector - in fact it's the cover that came off my HT600E when the HT600 DTMF front went on it.

MDC1200 was an option and it was totally contained in the front cover. As such the radio unfortunately offered only one ID for all channels. The later models (the Jedi series) was the first hand held radio to offer multiple MDC unit IDs. The optional front panel types that support MDC unit ID are: (thanks to K2HZ for this list and the DTMF list below)

• NTN5456A/B Unit ID Only (no emergency button or keypad)
• NTN5458B Unit ID and DTMF or Single Tone and DTMF (keypad, no emergency button)
• NTN5459B Unit Id, Emergency and DTMF (emergency button and keypad)
• NTN5457B Unit ID and Emergency (emergency button, no keypad)
• NTN6009A/B Unit ID and Emergency with Man Down (Similar to NTN5457B but has a tilt switch (activates the emergency alert if tipped greater that 60 deg)

There are also DTMF only keypad versions without MDC1200.

• NTN5697A DTMF encode/decode
• NTN5596A DTMF encode (continuous tone as long as the button was pressed)
• NTN5040A DTMF encode (a short burst of tone for each button press)
• NTN5395A DTMF with ANI (timed tones)

The 800 MHz and 900 MHz radios also had DTMF covers available, but I have no information on the NTN7910A cover on the one 800MHz radio I looked inside.

The NTN5596A "continuous" DTMF is needed for most amateur radio DTMF applications. It allows all DTMF digits plus # and * to be sent for the duration of the key press. The NTN5040A "timed" DTMF and the NTN5395A "ANI" DTMF are useful only for some specialized applications that work with 150ms long DTMF burst tones (and they can be preprogrammed). A resistor value could be changed to lengthen the 150ms burst to as much as 750ms, but that fact was not documented in the manual (i.e. each shop had to reinvent the wheel).

Missing info: (contributions of information are welcome!)
1) Supposedly there was a field mod to convert the 5040 (timed) into a 5596 (continuous) and vice versa. If anyone has the that information we'd like to have it to include here.
2) For that matter, if anyone has any manual sections or any photos of any of the above MDC or DTMF faceplates we'd like to have them.
3) Any info on the 800 MHz and 900 MHz DTMF covers.
4) The catalog lists the NTN5554A as the current DTMF retrofit kit for the P200, anybody have any information (or a photo) ?

Useful Repair / Cosmetic Part Numbers:

• 0105951N79 Assembly, Knob; On-Off/Volume (includes Clip, Push, 4205123Q02)
• 3205082E01 Gasket, "O" Ring; Volume Pot
• 1805100Q04 Switch/Pot, On-Off/Volume (S1/R140)
• 0105950N92 Assembly, Knob; Frequency Switch (includes Clip, Push, no part number given)
• 3205141Q03 Gasket, "O" Ring; Mode Select Switch
• 5005155Q03 Speaker (LS1)
• 4505535P01 Lever, PTT
• 1305676R01 Escutcheon (2-Freq. HT600 Radios) also known as NTN4749A
• 1305676R02 Escutcheon (6-Freq. HT600 Radios) also known as NTN4750A
• 4005148Q05 Switch, Frequency, 6 position for HT600 (S2)
• 1305676R07 Escutcheon, 16-Freq MT1000 Radios)
• 1305563R01 Escutcheon, Display (i.e. the 99 channel models)
• 6505214E05 Fuse (F1) (5 amps)
• 3205141Q02 Gasket, "O" Ring; Control Top
• 4005101Q02 Switch (S3) (Center-off mini-toggle for PL/Carrier/Scan)

• Switch, Frequency for 8 and 16-Freq MT1000 Radios)
• Switch, 2-position mini-toggle for PL/Carrier
• Escutcheon for single frequency MTX series radios (doesn't have a channel selector switch hole)
• Escutcheon, 6-Freq MT1000 Radios
• Escutcheon, 8-Freq MT1000 Radios
• Any Escutcheon part numbers for the "Man Down" fronts

Additional numbers are on the Parts and Accessories List for the appropriate radio; see the download / link section below.

Belt Clips and Protective Cases:

A belt clip could be mounted to the back of the radio, but most people used a protective leather or ballistic nylon case.

• NTN4916B Belt Clip for belts up to 1 1/2 inches
• NTN4924B Belt Clip for belts up to 2 1/4 inches
• NTN5389B Belt Clip for belts up to 3 inches
• NTN5602A Black Aluminum Public Safety Size Belt Clip for belts up to 3 inches
• Anybody have the black aluminum part numbers for the narrower belts?
• NTN5497A Swivel Button back cover kit
• 4282421J06 2 1/2 inch Leather Swivel Belt Loop
• 4205857B01 3 inch Leather Swivel Belt Loop

The "Carry cases" included:

• NTN4814C Heavy Duty Drop-In Holster - This heavy soft urethane (plastic) drop in holster holds the radio securely with a lanyard and includes a heavy duty belt clip.
• Standard NTN5460B Leather Carry Case with T-Strap and Spacer, for High or Medium Capacity Battery (Snap)
• Swivel NTN5461B Leather Carry Case with T-Strap, Spacer and 2 1/2 inch Swivel Belt Loop, for High or Medium Capacity Battery (Snap)
• NTN5883A Leather Carry Case with T-Strap, Spacer, and Swivel Belt Loop for High or Medium Capacity Battery (Snap), Fits 3 inch Belt
• NTN5450B Leather DTMF Swivel Carrying Case, Long (Snap), Fits 2 1/4 inch Belt
• NTN5460B Leather Carrying Case, Long, with T-strap, for high or medium capacity battery
• NTN5461B Leather Swivel Carrying Case, Long, with T-strap, and 2 1/2" belt loop for high or medium capacity battery
• NTN5884A Leather DTMF Swivel Carrying Case, Long (Snap), Fits 3 inch Belt
• NTN4814C Belt Clip Carry Holder, Fits 2 1/4 inch Belt
• NTN5827A Belt Clip Carry Holder, Fits 3 inch Belt
• 4205386S01 replacement nylon T-strap for leather carrying cases
• 4205447R03 replacement Urethane T-strap for carry holder (Snap)

Antennas:

The antenna adapter is listed in the Accessories section above. See the caution note in that section regarding using an antenna adapter made for another radio.

Antennas for the Genesis also fit other radios including the Motorola HT1550, HT1250, HT750, P1225, SP10, SP21, SP50, P10, P50, P100, P200, GP68, GP140, GP300, GP320, GP350, GP380, GP640, GP680, Spirit M, CP200, Pro1150, Pro3150, Pro5150, Pro7150, Pro9150. SP2550, and SL70.

The flexible ("Heliflex") antennas listed in the Moto catalog for the HT600 are:

• NAD6282A "Antenna, Heliflex, Coded Yellow (136-150.8 MHz)"
• NAD6283A "Antenna, Heliflex, Coded Black (136-150.8 MHz)"
• NAD6284A "Antenna, Heliflex, Coded Blue (136-150.8 MHz)"
• (The HT600-vintage catalog I looked at didn't list HT600 antennas in UHF, anybody have the "official" part numbers from that era?

• NAD6051A "Antenna, Heliflex, Coded Green (30-36 MHz)"
• NAD6052A "Antenna, Heliflex, Coded Blue (36-42 MHz)"
• NAD6053A "Antenna, Heliflex, Coded Red (42-50 MHz)"
• NAB6064A, 29.7-50 MHz replaces the three above, is manufactured 12 inches long, must be field cut to the center frequency of whatever channels are programmed into the radio. The cutting chart can be downloaded from the list of links below.
  Note that even the first three have to be cut to frequency, and ANY low band flexible antenna is limited to about 1 MHz of decent performance. While the radio will give you usable performance on both the 47.42 MHz Red Cross channel and on 6 meter amateur frequencies you CANNOT use one antenna on both withour risking your transmitter PA stage.
• NAD6282A 136-150.8 MHz
• NAD6283A 150.8-162 MHz
• NAD6284A 162-174 MHz
• NAE6231A 403-438 MHz
• NAE6232A 438-470 MHz
• NAE6233A 470-512 MHz
• 8505816K01 136-150.8 MHz, 6.5 inches
• 8505816K03 150.8-162 MHz, 6 inches
• 8505816K05 162-174 MHz, 6 inches
• 8505816K07 403-433 MHz, 3 inches
• 8505816K08 450-470 MHz, 3 inches
• 8505816K09 470-512 MHz, 3 inches
• 8505816K21 150.8-162 MHz, 6 inches
• 8505816K22 136-150.8 MHz, 6.5 inches
• 8505816K23 162-174 MHz, 6 inches
• 8505816K24 403-430 MHz, 3 inches
• 8505816K25 440-470 MHz, 3 inches
• 8505816K26 470-512 MHz, 3 inches
• 8505247K06 403-512 MHz, 5.5 inches

Missing info: (contributions of information are welcome!)
The physical length or other distinguishing characteristics of the NAD6282A (136-150.8 MHz), NAD6283A (150.8-162 MHz), NAD6284A (162-174 MHz), NAE6231A (403-438 MHz), NAE6232A (438-470 MHz), NAE6233A (470-512 MHz) antennas so that they can be identified when you find them in the junk box, or in a bin at a swap meet.

Batteries:

Nickel-Cadmium (NiCd) batteries deliver 1.2v per cell, Nickel Metal Hydride (NiMH) deliver 1.25v per cell. Each Genesis battery pack uses 8 cells to produce 9.6v from the NiCds and 10V from the NiMHs. The alkaline cells produce 1.5v each so 7 cells yield 10.5v. The battery pack total voltage will be a little higher when freshly charged.

The Genesis series never had a Motorola-provided pen-lite cell pack (also called a "clamshell"). I've been told that a couple of third parties made them and since this page went up I've had several emailed inquiries asking if anybody is still making an HT600 / MT1000 penlight pack. If anybody knows of someone who does, please contact the author.

NiCd, NiMH and alkaline packs are available from several aftermarket battery suppliers, including Interstate Batteries (yes, the folks that make car batteries), and Radio Shack (believe it or not)... Look here for Interstate, and here for Radio SHack.

All Genesis packs (NiCd, NiMH and alkaline) are sealed and once dead are intended to be disposed of (i.e. they aren't intended to have the cells replaced like in an Icom BP-series battery).

From an email to repeater-builder:
Here's an interesting way to open a HT600 / MT1000 battery pack: Put it into a ziplock bag and suck the air out (i.e. no or very little moisture to condense on it), freeze it solid then break the glue with impact shock. I put mine on top of the ice cube trays for several days, then take it out and SLAM it (bottom side down) onto the wooden chopping block. If the bottom does not pop out I SLAM it a second time, then check again. If necessary I put it back into the freezer for another couple of days and try again then. Some stubborn batteries have taken as many as 8 slams. I've not had access to dry ice or a CO2 fire extinguisher to try an even colder temperature.

Apparently the glue Moto used is cold-sensitive (some of the newer and aftermarket batteries are sonically or solvent welded and this trick doesn't work). Once the bottom pops off I can slide the cell pack out and replace the cells. If you do the Bob Meister charging-rate mod to your charger you can use NIMH cells and reuse the existing NiCad-rate thermistor.

Note that you should always use cells that are from the same date code, and trickle charge them individually at a C / 30 rate for a couple of days before you assemble them into the battery pack. You do NOT want to mix charged and discharged cells into a series string.

From another email to repeater-builder, after reading the above one:
Just use canned freeze mist, or even the canned air they sell for blowing out computers (turn the can upside down and the cold liquid comes out). Spray the liquid air on the seam, go round and round about 5-6 times until it is not going to get any colder, and SLAM it (bottom side down) onto the wooden chopping block. The cover will pop off with the first slam (but as you posted this trick is no good on the sonically welded or solvent welded cases).

Read the note in the charger section before you charge any Nickel Metal Hydride battery pack.

The battery table has been moved to its own article. Click here or on the link at the bottom of this page.

Battery Chargers:

Only the NiCd and NiMH are rechargeable - never try and charge an alkaline pack.

If you have ANY of the stock Motorola rapid chargers DO NOT charge a Nickel Metal Hydride pack until you have read this article and modified your charger.
If you drop an NiMH battery into any unmodified charger for even just one charge cycle you can overheat it to the point of permanently ruining it.

If you drop a battery into one of the rapid chargers and both charger LEDs flash on and off that indicates one of three things - you have a an open battery pack (which could be caused by an open thermal breaker inside), you have shorted cell (or cells) in the battery pack (i.e. the pack is delivering a too-low voltage) or the charger has died. A voltmeter across the top of the battery will provide the answer for the first two possibilities (no voltage or low voltage)...

The battery charger information has been moved to its own article. Click here or on the link at the bottom of this page.

Mobile Adapters and RF Amplifiers:

The earliest mobile charger was made for the HT200 series and is was basically a box bolted under the dashboard. All it contained was a mobile nicad charger that took +12vDC in and delivered +16vDC out at 60ma. A later redesign (during the HT220 era) supported a special front cover on the handheld radio that had a number of contacts on the lower edge of the speaker grille area. These contacts connected to the speaker, microphone, PTT, etc circuits and allowed a mobile microphone jack and an amplified speaker. A permanent magnet in the sleeve "reached" through the aluminum frame and magnetically switched the radio to an external antenna connector. This unit was called the Convert-A-Com (but some folks called it a "jerk-and-run") and was used with the HT220 and MT500 series radios. When the PAC-PL and PAC-RT mobile repeaters (sometimes called a mobile extender) came along they added a switch on the front panel (labeled "Mobile Repeater On/Off") and a second one in the bottom of the radio pocket. When the front panel switch was on, and the radio was out of the pocket the crossband repeater was enabled.

The mobile charger was still in the product line at the time of the first of the Genesis series radios (the HT600), and was updated with a new, properly sized pocket for the different dimensions of the new radio (see this photo). I have seen one that had a clear lens on the left hand lamp (labeled "On/Charge") that lit up either green (on) or amber (charging), and a red lens on the right hand lamp (labled "Repeater On"). I have no idea if that was a later model, a prototype that escaped from the lab, or a one-off very-well-done custom modification.

As part of the Genesis development the unit was redesigned to clamp the radio into the charger pocket (the US Forest Service, the Border Patrol, and the military had complained - loudly - that the radios bounced out of the chargers on rough roads), to add both a channel display and a mobile microphone and speaker, and was given a new name: the Mobile Vehicular Adapter (MVA), and it was redesigned even later for the Saber series of handhelds and was renamed yet again as the Saber Vehicular Adapter, or SVA). Despite the new name(s) some folks still call them a "jerk-and-run". The Genesis Line MVAs come in two versions, the basic, and the enhanced. Neither has the mobile extender enable switch - that was relocated to the mobile radio control head (or front panel).

The information on the MVA and its associated RF amplifiers and amplified mobile speakers has been moved to this article - An Overview of the Genesis Mobile Vehicular Adapter (MVA). This article also includes the information on modifying the MVA charger section for NiMH batteries.

The basic MVA has a single (slow) rate battery charger in it, and the enhanced MVA can do rapid, standard and trickle rate. A basic MVA could be field upgraded by adding the missing parts, and in fact I've seen one that had the solder sucked out and the parts poured in. The enhanced MVA has the same overcharging problem with NiMH battery packs that the desktop and gang chargers have, and the fix is the same: change one resistor. This is documented in the MVA article mentioned above and in the link list below.

Missing info: (contributions of information are welcome!)
Does anybody have any of the following that they would be willing to contribute?)
Any missing model numbers for mobile chargers.
PDFs of the mobile charger manuals, or at least the schematics.
Digital photos a mobile charger interior (a "photo tour").
Digital photo of an older style mobile charger with a radio in it.

The Genesis line package comes apart in a non-obvious way. Bob Meister WA1MIK scanned and PDF'd the disassembly section of his HT600 manual, and the HT600E Service Manual 68P81050C45-O covers the differences in the 99-channel radios.

Missing info:
1) A photo sequence of how to disassemble and reassemble a radio.
2) What is involved in swapping an RF board, or a control board.

Miscellaneous info:

The official Moto tuning tool for all the Genesis RF boards is the part number 6605106N01. It fits all the tunable coils, the receiver preselector, adjusts the synthesizer reference oscillator frequency, and all of the various trimmer capacitors. In late 2006 it listed at about $12. The small metal tip is more fragile than it looks. Be gentle with it.

The 0180358A59 Programming Aid enables programming of the DTMF pad from outside of DTMF optioned radios. It is a very rarely needed device, and is mentioned here only in case you stumble across one. (i.e. once Google indexes this page and catches the 01-80358A59 number someone searching for it will find this paragraph).

Comments on using the Genesis on amateur radio frequencies:

The Genesis portables were made in bandsplits that cover 2m and UHF. The 30-36 MHz low band radios can be "stretched" to 10 meters (28-30 MHz), and the 42-50 MHz ones can be stretched to 6 meters (50-54 MHz, see the article below), but as said above, the antenna limits the RF coverage of any low band radio to about 1 MHz of spectrum. When you buy a radio on eBay there is no way to tell which bandsplit the seller is offering without either (a) reading it with the appropriate software and programming hardware; or (b) physically opening the radio and checking the part numbers of the RF-sensitive modules. If the seller volunteers the split information you are counting on him being knowledgeable on the individual radio he is selling.

Programming a Genesis will require appropriate RSS (get the last version), programming cable (which you can make from a audio adapter, antenna adapter or an old speaker-mic cable), a RIB and an older computer that can run the software under MSDOS or PCDOS ver. 5.x or 6.x.

If you are moving it more than a few megahertz it will also require the use of a service monitor to perform fine-tuning and receiver alignment. The alignment instructions are in the HT600E document available above. The UHF radio is wide enough that you can stagger-tune it and get decent performance on both amateur and on GMRS. The high band radio will work well on amateur, CAP and MURS.

Some of the 2 channel radios are locked at two, some can be bumped to 6. The 6 channel radios are fixed at 6, the 8 channel radios can be bumped to 16, the 16 channel radios are stuck there, the 32 channel ones can usually be pushed to 99 (see above). The 99 channel radios are relatively rare. The 8, 16 and 99 channel units can be programmed to do scanning of up to 8 channels. The radios can do any standard PL and DPL and both transmit and receive RF and tone frequencies are independently programmable on a per channel basis.

The radios are wonderful units, and will survive a bulldozer driving over one (ask me how I know...), but I do not recommend getting a Genesis for everyday amateur radio work unless the radio comes with a good battery and a charger and you:
A) Have a limited number of RF channels you use (and if a 99 channel radio, fewer than thirty combinations of tones/DPLs).
B) Do not need front panel programming of RF frequency and tone.
C) Do not need 16-button DTMF (i.e. you are not a repeater control op). Finding a DTMF front for a non-DTMF radio may be difficult, and then it's only 12-button (but I've seen a PIPO 16-button DTMF pad mounted on a plain front - it's only a 3-wire hookup... power, ground and DTMF audio out).
D) Can live with not being able to acquire a penlight cell battery pack... this is not the radio you want to use for a major emergency communications deployment.
E) Have or have access to all the necessary test gear and programming gear.
F) And you know exactly what you're doing with the older Motorola portables.

However I know a few folks that have 16-channel MTs for loan out to visiting family members. They are durable and pretty-much idiot proof. The channel load in the UHF radios is a mix of GMRS and amateur channels (yes, the UHF radios will span a range large enough to cover both services) and the VHF radios have both amateur and the 2 wideband MURS frequencies in them. The GMRS and MURS channels are for the non-hams.

Articles, Manuals, Files, Documentation and pointers:

If anybody has any contributions please let us know... Things like o ther manual part numbers, including any RSS manual numbers, or PDFs of any out-of-stock / NLA manuals.

	HT600 User Guide   (early)   6881057C25   1.7 MB PDF   Donated by A. Nony Mous The later one was 6881065C75 and is still available at about $16.
	HT600E VHF/UHF Operating Instructions is part number 6881050C35.
	HT600E Theory/Maintenance Manual number 6881050C50
	HT600E Programmer/Tuner Manual number 6881050C55 (this is the manual for the RSS)
	HT600 Parts And Accessories List
	A Cutting Guide for the Low Band MT1000 Heliflex Antennas
	MT1000 Parts And Accessories List   Actually it's relevant to most of the Genesis line...
	MT1000 Operating Instructions Part number 6881061C35-D dated 1992. An earlier one was 6881049C95, does anyone have it in PDF, or have a copy we can make a PDF from? There is another one titled "MT1000 Handie Talkie Portable Radios instruction manual (covers Low Band, VHF and UHF)" number 6881061C40A. Does anyone have it in PDF, or have a copy we can make a PDF from?
	The MT1000 VHF/UHF Instruction Manual is part number 6881067C40. While the title says "Instruction" this is actually the full service manual, and is about $19.
	MT1000 Theory/Maintenance number 6881050C15
	MT1000 VHF 6881050C05 (early )
	MT1000 UHF 6881050C10 (early )
	MT1000 UHF 403-433 & 438-520 MHz part number 6881061C45
	MT1000 Radio Service Software Users Manual number 6881050C20
	P200 Operating Instructions Part number 68P81059C05-C dated 1990. There is another one titled "P200 UHF manual", 68P81059C25
	MTX800 and MTX900 Users Guide   68P81079C65-O
	Manual for the rapid charger for P200, HT600, MT1000 and other Genesis radios.   This is the service manual for the NTN5538B (120vAC 60Hz) and the NTN5539B (240vAC 50Hz) desktop rapid chargers.   2 MB PDF file     Donated by A. Nony Mous
	Manual for the slow charger for P200, HT600, and other Genesis radios.   This is the service manual for the NTN5540A (120vAC 60Hz) and the NTN5541A (240vAC 50Hz) compact desktop slow chargers.   1 MB PDF file     Donated by A. Nony Mous
	Updating the Genesis series Handheld Desktop Rapid Battery Charger   By Robert W. Meister WA1MIK How to resolve two really annoying problems in an hour or less.
	A Modification Procedure for the Genesis Series Rapid Charger for NiMH Batteries   By Robert W. Meister WA1MIK     A one resistor easy fix that prevents overcharging / overheating of the NiMH battery packs. Note that this mod may or may not be required - it depends on which value of reisistance thermistor was used when your NiMH pack was built.
	A Table of the Genesis Series Batteries   By Mike Morris WA6ILQ. Contributions and corrections welcome.
	A Table of the Genesis Series Battery Chargers   By Mike Morris WA6ILQ.   This list is not complete, contributions and corrections welcome.
	MVA Vehicular Adapter Instruction Manual - 6881062C75. Again, while the title says "Instruction" this is actually the full service manual, and is about $27.
	An Overview of the Genesis Mobile Vehicular Adapter (MVA)   By Mike Morris WA6ILQ.   This article also includes a few comments on the RF amplifiers that went with the MVAs, and also has the information on modifying the MVA charger section for NiMH batteries. Contributions and corrections welcome.
	Stretching the 42-50 MHz MT1000 or P200 to the 6-meter amateur band   By Mike May WB8VLC/7

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This page originally posted on 11-Apr-2007 by Mike Morris WA6ILQ.