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The Motorola CDM Series Mobile Radio Index Page And with some information on the Waris handhelds (HT750 / 1250 / 1550 series) Originally created by Mike Morris WA6ILQ and improved upon by Robert Meister WA1MIK (SK) with information provided by several people. Currently Maintained and Updated by Mike Morris WA6ILQ |
DONATIONS OF INFORMATION, ESPECIALLY PDFs OF MANUALS WE DON'T HAVE WOULD BE GREATLY APPRECIATED.
Comments / critiques / suggestions / corrections / updates for this page are welcome and appreciated.
(Actually for any page at this web site)
The CDM-series of mobile radios are great radios… They were introduced in 1999 and were the follow-on series to the MaxTrac / Radius / GM300 product line. The CDMs were the mobile radios in the "Professional Series" product line which also included the HT750, the HT1250, and the HT1550 handhelds and used the same programming software (CPS). The code name used in the development of the Professional Series was "Waris" and you will find references to the Waris Series on other web pages. There is a CDM model number decoder below.
In Europe the CDM750 is essentially a GM340, the CDM 1250 has no direct equivalent, the CDM1550 is a GM360. The firmware used in the GM340 and GM360 is different from the USA cousins.
The CDM series was also exported.
In Europe the USA CDM750 is essentially a GM340, the CDM 1250 has no equivalent, the CDM1550 is a GM360.
In other areas the CDM750 became the PRO3100, the CDM1250 became the PRO5100, the CDM1550 became the PRO7100.
The GM338 is an Australian / Asian market version of the GM360.
Despite the numbering, the GM350 was a generation before the GM340, it came in 4ch and 128ch versions.
There is also a GM950 4 channel and 128 channel which was essentially the same hardware plus a 5-tone
signalling option.
Any other details on USA versus non-USA models would be welcome.
Think of the Motorola CDM series as an HT750 / HT1250 / HT1550 series handheld radio repackaged as a mobile except with a very good (varactor tuned) front end on the receiver, a good power amplifier on the transmitter and a big display. They are built in a very well shielded aluminum chassis. The interior of the radio is compartmentalized and each section of the radio is fully shielded from the others by the lid which has internal dividers for each section.
Unfortunately all CDM support has been discontinued as of June 2015. Parts are limited, some are No Longer Available ("NLA"), like the custom-made (by Murata) surface mount wide band IF filters. Somewhere around 2001-2003 the CDMs were replaced in the sales book by the XPR series and the CM200, CM300 and PR400 series of mobile radios (anybody know the actual XPR or CM introduction date?).
In Europe the CDM750 is essentially a GM340, the CDM 1250 has no direct equivalent, the CDM1550 is a GM360. The firmware used in the GM340 and GM360 is different from the USA cousins.
The CDM series was also exported.
In Europe the USA CDM750 is essentially a GM340, the CDM 1250 has no equivalent, the CDM1550 is a GM360.
In other areas the CDM750 became the PRO3100, the CDM1250 became the PRO5100, the CDM1550 became the PRO7100.
The GM338 is an Australian / Asian market version of the GM360.
Despite the numbering, the GM350 was a generation before the GM340, it came in 4ch and 128ch versions.
There is also a GM950 4 channel and 128 channel which was essentially the same hardware plus a 5-tone
signalling option.
Any other details on USA versus non-USA models would be welcome.
If anyone has additional hints / tricks / gotcha's, manuals or documents on any CDM or Waris radios we'd be happy to post them… You can be credited or anonymous, your choice - please contact the page maintainer listed above.
For example, a step-by-step article on how to recover from the "EEPRM CS ERROR" situation would be useful.
Yet another example would be a step-by-step procedure to stretch the lower limit of the 450-512 MHz "S" range radios down to 440 MHz. without losing receiver sensitivity or transmitter power.
Another would be a step-by-step conversion of the "200 MHz" CDM (which was actually shipped on 217-222 MHz) to cover the amateur FM spectrum at 222-225 MHz.
Anybody have any Service / Repair Notes or Field Service Bulletins to share?
| Jump to: | Programming the Waris Radios Interfacing to Other Equipment Mounting and Brackets DC Power |
| Control Heads and Remote Mount Kits The Mini-UHF Connector Articles Manual PDFs Accessories |
Programming the Waris Radios: (the CDM mobiles and the HT750 / 1250 / 1550 series handhelds)
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The CDM radios are programmed by HVN9025 Professional Radio CPS which runs under Windows 95, 98, XP, 7 and 10. That CPS also programs these: CDM750, CDM1250, CDM1550, HT750, HT1250, HT1550, MTX, EX500, EX600, EX600XLS, PRO5150, PRO7150, PRO9150, GP320, GP340, GP360, GP380, GP318, GP338, GP640, GP680, GP1280 and several others.
The HVN9025 CPS allows selectable wideband or narrowband on a per-channel basis. Unfortunately you cannot clone one model of handheld to another or to a mobile or a mobile to a handheld. You want to find and use Revision R06.12.05 (released in December 2011) as it is the last one that allows wide or narrow selection without a "Professional Series" wideband entitlement key (more on that below). That revision also fixed a number of problems / bugs including the 64‑bit Windows USB problems (it can use COM1-16), and it can be found "out there". We have the 6.12.05 Release Note (11 KB PDF), they skipped 6.12.06 and 6.12.07, we have the 6.12.08 Release Note (100 KB PDF) and the 6.12.09 Release Note (100 KB PDF). The 6.12.09 revision is dated 12/14/2016 and was the last one. All three release notes open in new browser windows. I was told that all versions after 6.12.05 locks you to the 12.5 KHz unless you have a "Professional Series" wideband entitlement key – And the keys are different between MotoTurbo (DMR), Professional Series, and Commercial Series (and as of late 2024 those keys are No Longer Available - NLA). An email to Repeater-Builder reported that this "feature" bit the sender in the behind when he purchased a radio on eBay that was last programmed with a newer revision. He ended up reselling that radio on eBay and bought another as he needed wideband and couldn't get a key. The replacement CDM was happy with Release 6.12.05. I have been told that the only difference between Release 6.12.05 and the later releases is the forced narrowband, the addition of a few newer model numbers into both the internal programming tables and into the directory that contains the sample codeplug files (and those sample files can be copied from the newer versions into your copy of Release 6.12.05). Unless you really need something in a later release (and you'd better have an entitlement key) there is no need to go anything newer than Release 6.12.05. And always ask the seller what the radio was last programmed with. |
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The Mobile Programming Cable: Motorola's literature says that to program a CDM you need their RKN4083A RJ-45 (8 pin) CDM / CM200 / CM300 / PR400 series RIB-based programming cable, or the RKN4081C is the ribless version. The RIBless cable has a 25 pin female connector (there's a circuit board inside), needs (and comes with) a 25 pin to 9 pin adapter. The RKN4081C cable sells for about $250-$300. Here's the PDF that comes with the RKN4081. Photo 1 Photo 2 Photo 3 Motorola's literature lies. You don't need to spend $250-$300 to buy a CDM programming cable, your existing RJ-45-style Maxtrac / Radius LRA / GM300 cable (either 9-pin D connector or USB-based) will work just fine for everything except loading new firmware. If you don't already have an RJ-45 cable then get either this RKN4081 9-pin D connector to RJ-45 cable or this FTDI USB to RJ-45 cable (both links are off-site pointers and open in a new browser tab). If you are going to buy a USB cable then buy an FTDI based cable as they don't need any funny drivers, they work with the stock Windows drivers. I have seen reports on other mailing lists that people have had issues with Prolific-based cables. If you are part of the 5% that will need to update the firmware in a CDM then you will have to build or buy a RLN4853 Adapter Cable (which is easy, it is just two connectors and a few inches of 4-conductor cable). There are details in the CDM Notes article below. The Portable Programming Cable: The RKN4075 cable is used to program the HT750, HT1250, HT1550, MTX150, MTX1500, MTX1550, MTX450, MTX4500, MTX4550, MTX850, MTX8250, MTX9250, and several others. |
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Recommendation: Save the original codeplug that came with your CDM and also save your tuning data (you will need the Tuner program to do that). You never know when you might need them. A firmware upgrade to a Waris radio will not change the tuning information. I repeat: Before you do anything to a new-to-you CDM you need to read and save the original codeplug it came with AND use the Tuner program to read and save the tuning data. Having this data will allow you to fall back to a known starting point if you ever have a problem. It's best to have it and not need it than to need it and not have it and can't get it. |
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The front panel microphone connector (photo) on a CDM is a 10 pin, not the normal 8 pin (but your 8-pin programming cable will work just fine). The 10 pin connector plug body (photo) is the same size / width as the standard 8 pin and at first glance you won't realize that the CDM has a 10 pin connector. The additional two pins are only used by the CDM-specific DTMF microphone (but it's only a 12 button microphone).
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When programming a CDM mobile or a HT750 / HT1250HT750 / HT1550 (Waris series) handheld do NOT touch anything until you get the second set of beeps after loading a codeplug. The radio will beep when the programming load is complete, then the radio will reset and restart itself. That restart concludes with another beep. WAIT for that post-restart beep! If you start unplugging cables or shut off the power in-between the beeps you stand a good chance of corrupting the radio… This is the voice of experience. Yes, you can recover a corrupted Waris family radio, even one that doesn't boot. One of the features that was specifically included in the Waris family design was that it is almost impossible to completely brick a Waris radio. The Waris pages at the W9CR web site walks you through the recovery process. (off-site pointer, opens in a new browser tab) One caution: Do not let the power fail while programming the radio, ESPECIALLY while flashing / loading firmware. The author programs radios with a laptop that has a good battery plus is plugged into an AC outlet. He runs the radio from a common 12 volt 7 amp-hour battery during programming and flashing. This way another power outage at the wrong moment won't cause a problem. Second caution: If you have a remote head or dual head environment Moto recommends that you disconnect any dual head kits or remote kits while programming. They say to use a local head only while programming and ESPECIALLY while loading firmware. |
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You can program the CDM through the rear accessory jack if you use a
RLN4853 adapter. (link opens in a new browser tab) It's
very easy to build one yourself, look at the photo, it's nothing more than a RJ45 female connector, a short length
of 4-conductor cable, and a 20-pin accessory connector… The schematic is on page two of the PDF. The
author knows of a group that run a large number of CDMs without any heads – they are used as receivers,
exciters, remote bases, full duplex 420-438 MHz links (a pair on each end) and as control receivers. Every
single one has been (and is) programmed through the accessory connector. Kurt Meltzer, KC4NX / WB9KNX / Meltzer Radio Engineering sells cables and cable kits on ebay as seller "mre1032" (off-site pointer, opens in a new browser tab) and his Cable Kit #93K" (off-site pointer, opens in a new browser tab) is perfect for building a CDM accessory connector programming cable. It consists of a 20‑pin Motorola CDM acccessory plug and about 3 feet of 5 conductor (4 conductors plus shield) cable with the connector pins preattached... all you have to do is to slide them into the correct positions in the connector body. Add an 8‑pin female RJ-45 connector to the other end of the wires and you are done. Just plug your mobile programming cable into the RJ-45 jack and plug the 20-pin plug into the back of the CDM. |
If you do a lot of radio programming, especially away from the workbench, you might want to consider dedicating an older laptop to radio programming. A desktop woudl also work, but a laptop gives you mobility. I started with a Panasonic Toughbook (F‑28 over 10 years ago and now prefer the CF‑30 and CF‑31 models because they are cheap, readily available, configurable, repairable, Mil-Spec rugged and have a 9-pin hardware COM port that always works. I have an article that is linked on the previous page – "Some Thoughts on Radio Programming Computers and Laptops". That article is an opinion piece and my needs are probably different that yours – what works for me may or may not work for you… (but that article may give you some ideas).
Interfacing to External Equipment: (repeater controllers, APRS encoders, etc.)
The rear acccessory connector on a CDM is identified on the schematics as J0501. The interfacing of a CDM is very similar to a GM300 or the previous Maxtrac and Radius LRA radios and you might want to look at those pages at this web site.
The CDR500 is the tabletop repeater housing that replaced the tabletop GR300 repeater in the Motorols product line.
Likewise the CDR700 replaced the GR500 wall mount unit. Both contain a pair of CDM750s and a option module.
The most common one is the RICK (HLN3333) module – a very, very basic repeater controller however
there are several others. The CDR500 Wall Mount Repeater & CDR700 Desktop Repeater
Service / Programming Manual listed below has a lot of info on the interfacing to the CDMs, plus info
on the various add-in controllers: the RICK, the ZR310, i20R, ZR340, HPN9005, HKPN4000, HKPN4001 and
the HKN9033. It has almost nothing on the internals of the CDM radios, that information is in the Basic
and Detailed Service Manuals.
Click here for the CDR500 / 700 brochure.
One major difference between the CDM series and the previous GM300 models: The GM300 has five channel steering lines allowing selection of 31 channels (plus the one currently selected by (and displayed on) the control head) where the CDM has only four lines (15 channels plus the one selected by the head). If you need five lines (31 channels + head) then you'll have to skip the CDM and either go back to the GM300 series or use the XPR series radios.
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The accessory connector on the rear of the CDM is made by TE-AMP and uses a 20 pin
connector body, not 16 like the previous models. The center 16 pins are almost identical, the
designer added two pins to the left of the old connector, and two more pins on the right. Your GM300
cable will plug onto the center 16 pins and work just fine – with one exception:
pin 15 used to be a speaker connection, it is now a DC analog voltage output and the pin 15 to
pin 16 speaker jumper in your old cable must be cut. More details below.
A wide variety of 16- and 20-pin connector cables and connector / interfacing kits / cable kits can be purchased from ebay seller "mre1032" (Kurt Meltzer, KC4NX / WB9KNX, Meltzer Radio Engineering). (off-site pointer, opens in a new browser tab)
Accessory Connector Notes:
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Mounting and Brackets:
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The mounting bracket bolts onto the CDM with either M5 or 10-32 threads (both will work). Motorola provided thumb screws with their kits. If you provide your own screws you should trim them to about 1/4 inch (6 to 6.5mm) length into the radio body – any longer risks damage to the electronics inside the radio. |
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The GLN7324A is the standard mobile bracket. It will not fits low band CDM as the low-band CDMs are high power only and use a larger body and hence use a larger bracket, the RLN4774A. |
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The RLN4781A is a bracket that mounts a VHF / UHF CDM into a standard auto radio DIN opening. It's widely used in the UK and Europe for mounting the radio into a taxi or shuttle bus dashboard. |
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The factory tabletop tray for the CDMs is a GLN7326A. It has a front-facing speaker in the bottom, the GLN7318 is the same plastic tray but without the speaker (but you can add your own). If you want to disable the internal CDM speaker you need to upen up the head and disconnect it (there is no programming option or jumper). |
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Novexcomm) (off-site pointer, opens in
a new browser tab) makes and sells a dual or single CDM rack mount chassis that is available with or without
your choice of a 15 amp 120vAC supply (for low power radios) or a 30 amp 120 / 240v
power supply (for high power radios or 240v mains) or no power supply at all (they also do custom work).
Look at their eBay store or if you want to save the eBay markup just order direct from their web page. They
aren't limited to CDMs, they make their rack mounts with your choice of any brand or model of radio and
can customize it. Disclosure: your page author has known the owner of Novexcomm (WB6SLC) for 40+ years. No, he's not paying for this pointer. |
DC Power and Power Supplies:
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You don't need a lot of power supply to run a CDM as a control receiver, repeater receiver or link receiver…
On receive they draw less than 1/2 amp with the squelch open. Your author knows of a receive-only radio
running in the back room at an ambulance company feeding a 24x7 audio logging recorder and running on a
12 volt 3/4 amp wall wart. The low power (25 watt) VHF and UHF radios draw about 8 amps on transmit, the high power (45 watt) ones pull about 14 amps, the 60 watt low band radios can draw as much as 18 amps. |
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Motorola offers multiple DC power cords for the CDM:
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Astron sells the SL-15SCDM 15 amp desktop radio housing / power supply for the low power CDMs. |
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Samlex offers two different housing / power supply units for the CDM750, CDM1250 and CDM1550 series: the SEC-1212-CDM (12 amp for the low power CDMs) and the SEC-1223-CDM (23 amp for the high power CDMs). |
The CDM Control Heads and Remote Mount Kits:
There are three different control heads for the USA CDM product line. The CDM750 control head is a part number GCN6112, the CDM1250 head is a GCN6113 and the CDM1550 head is a GCN6114. There is a GCN6116 "Databox" Data Control Head for the radio modem version. There is also a "head" (I don't have the part number yet) that mounts on the front of the radio body when using a remote head. It has a 10-pin (RJ-50) (RJ-45-like) connector for the remote cable. You can program the P1, P2, P3 and P4 keys with numerous options but the up / down / left / right arrow keys are not programmable.
There is a connecting piece that fits between the CDM radio body and the control head. Motorola calls it a "backhousing", some people call it a head spacer, a spacer or a sleeve. The CDM750 control head looks very much like the CDM1250 and CDM1550 heads but it is a different physical size and has a different shape. As such there are two different backhousings: The CDM750 backhousing is part number 1586092B01 and the backhousing for a CDM1250 or CDM1550 is part number 1586093B02.
It is a good idea to consider the CDM head and backhousing as a paired set. This is the voice of experience.
CDMs can be remote mounted with the appropriate remote mount kit. There are two different kits and the only difference betwen the kits is different backhousing, sleeves or spacers, as mentioned above. The RLN4801 kit is for the CDM750 and the RLN4802 is for the CDM1250 and CDM1550 radios. Neither kit includes the interconnecting cable, you need to order a Cable Kit: RKN4077 (3 meters long), RKN4078 (5 meters long) or a RKN4079 (7 meters long).
Moto's own literature says that there have been issues with programming CDMs with the remote mount kits connected. There is also a dual head kit for stuations like a single mobile radio shared by an ambulance driver and by the paramedic in the rear patient care area of the ambulance. Motorola says to never program the CDM with the dual head kit connected. Personally, I always program them with only a local head in place either by a progrmming cable plugged into the microphone jack or by a programming cable that is pluged into the accessory connector. Disconnect the dual head interface box, attach a local head to the radio, then program it. Or program it through the accessory connector.
Control Head Internals: Each of the heads has it's own 68HC11 microprocessor inside, slaved
to the 68HC11 processor that runs the radio. If you have a flaky head just remember that all of the silicone
buttons on the front of the radio are electrically arranged in an X-Y matrix that can be very different than the
physical arrangement. Think of each button as having a virtual "row" and "column",
that can be very different than the physical row and column. Each button when pressed generates two analog
voltages based on "row" and "column". Both the row and column voltages are fed to
separate analog inputs on the control head microprocessor. If you have control head issues first swap the
head if the issue follows the head then unplug and plug each end of the ribbon cable. On a regular
front-mount radio (not a remote mount) the 12-conductor ribbon cable that connects the head to the radio
is part number 8486127B01. There is a blue dot on cable to make sure it's not installed upside down. The
dot goes towards the "0" marking cast into the front of the radio. Make sure that the ribbon
cable is in the connector, it's easy to slide it into the slot between the connector and the circuit board. Then
carefully take the control head apart… All that is needed is a plastic putty knife or a plastic prying tool
or a small flat-blade screwdriver. The volume knob is snapped into the housing, the pot shaft just fits loosely
into it. When you take the board out the potentiometer will stay on the board and the knob will stay in the
housing. The exploded view in the Basic Service Manual is wrong! Make sure the PCB contact
pads under each button are clean. When you put the head back together you have to make sure the D-shaped
hole in the volume knob and the D-shaped shaft are lined up.
Was the flaky head in a marine environment? Or in a beach patrol Jeep? It could have salt deposits or
corrosion inside the head. The CDM was not intended for the marine environment – marine radios
have better seals around any case openings.
Was the flaky head given a coffee or Coke bath? I've seen CDMs mounted vertically, on the dash of a
truck and in a school bus. All horizontal surfaces (like control head faceplates on vertically mounted
mobile radios) are magnets for soda cans and coffee cups. Someone could have accidentally have spilled
a soda or coffee that leaked into the volume control hole or the speaker grille of the head before you got it.
The CDM (and others) Mini-UHF Antenna Connector:
The antenna connector in the CDM series and many other Motorola radios is a Mini‑UHF female . The mini-UHF connectors were ntroduced in the 1970s, and first showed up in the consumer world in the old cellular mobile phones and similar applications where size is an important consideration. The mini-UHF uses a 3/8-24 thread size and Amphemol says it operates up to 2.5 GHz.
The mini-uhf connector is much more fragile than the standard UHF or even the type N connector.
This is especially true if you use stiff antenna cable like LMR400, RG213 or RG214 and an adapter to the radio. Motorola offered a test bench adapter (mini‑UHF male
to BNC female) back in the Maxtrac daysand still does as the
HLN8027 Mini‑UHF male to BNC female adapter (about $11).
Your author considers a pigtail (mini‑UHF male to N female) with silver plated
connectors and quality RG-400 cable to be a requirement for all mini-UHF connectors at radio sites.
The pigtail relieves the stress on the radio connector. The broken connector problem got so bad that
Motorola came up with two adapter cables: the
8 inch long HKN9557A Mini‑UHF male to UHF SO‑239 female Antenna Adapter Cable
for about $19, and an 8 foot version as the
HKN9088A Mini‑UHF male to UHF PL‑259
Male Adapter Cable for about $40.
You can make your own adapter cables for a lot less money… and by doing so you will have the
option of better coax (RG‑400) and the connector of your choice (you will want to use silver plated
connectors). I made up a few 1 foot long mini‑UHF‑male to N‑female cables
for my test bench back when I got started with Maxtracs.
A friend prefers mini‑UHF‑male to BNC‑female
pigtails for his bench test cables. When you assemble your own then it is your choice.
A comment on the Mini-UHF connector from a friend who has been in the Land Mobile Radio business since the 1970s:
Especially in mobile service a lot of installs or sloppy loose attachment by service techs ends up putting side pressure on the center pin. This will spread the female contacts in the radio connector. Visually inspect, and see if your connection acts at all flaky. The CDM antenna connector is replaceable, but its NOT a job for the faint of heart, or those inexperienced in soldering. It is best to use a dental pick or similar and get at the tines in the female and "encourage" them inward to make a tighter connection. DO NOT get carried away and break one of the tines.One source of the bulk connectors is Talley on this page.
The acid test: Take a unused male pin out of a new connector kit, stick it into the radio connector, and turn the radio vertical with the antenna connector facing down. See if the pin falls out.
Articles, Modifications and Other Information:
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Some CDM notes from Mike WA6ILQ |
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CDM Product Line Model Number Decoder 473 KB PDF. This was extracted from the Basic and Detailed service manuals listed below and compiled by Mike WA6ILQ. If anyone has any of the other region codes he'd appreciate an email. |
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The CDM-series rear panel Accessory Connector by Robert W. Meister WA1MIK (SK) Note that the pin numbering is NOT what you would expect… they added 2 pins on each side of the Maxtrac / GM300 16 pin connector… |
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How to Remove a Motorola UHF CDM 1250/1550 Password By
Dennis Rogers N5VRP 107 KB PDF Dennis's radio group bought a CDM on eBay and found that it had a password… They got around it. While this prodedure was written about his experience with a CDM 1250 or 1550 this process will work on any Waris family radio… |
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Making the CDM-series Radios Operate Out Of
Band by Joel Huntley WA1ZYX (offsite link) This method requires just some simple hex-editing. |
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Additional information regarding the above out of band mods 35
kB PDF by James Lawrence NA5RC Especially important if you are running CPS Revision 6.12.05, which you should be… |
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Invalid Region Code error? 82 kB PDF by James Lawrence NA5RC Some CDMs sold on popular auction sites often come from foreign markets and can't be programmed with the standard software distributed in North America. The CPS throws up a big error message. Here's a simple fix using RegEdit (which comes with Windows). |
Manuals, Brochures, Guides, and Other Printed Material:
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CDM series brochure 1.8 MB PDF Covers the CDM750, CDM1250, CDM1550, CDM1550LS+ models on low band, VHF, UHF, 200, 700 MHz. 2014 vintage. |
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Motorola CDM Series Product Overview 3.3 MB PDF This is a sales document produced to go along with the introduction of the CDM mobiles in 1999. |
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CDM Series "MotoTurbo" Product Brochure 542KB PDF This is one of the official "Professional Series" mobiles product brochures. Not shown is the CDR700 update to the dual-GM300-based GR300 tabletop repeater or the dual-CDM CDR500 replacement for the wall-mount GR500. CDR500 External Photo CDR500 Internal Photo CDR700 photo 1 and CDR700 photo 2. Both could be configured as in-band repeat, one-way-crossband-repeat or bidirectional-crossband-repeat. The available acccessory modules that fit into the CDR500 or the top slot of the CDR700 are the same as offered in the GR300. |
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Standardized Display Nomenclature on the CDM1250 and CDM1550
series radios By Matt Lechliter W6XC 560 KB PDF The CDM1250 and CDM1550 have a 14 character LCD display. Here's how one system uses it on their repeater and link radios. |
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CDM and PRO-series Basic Service Manual 3.8 MB PDF This basic manual covers all CDM and PRO series mobile radios. 6881091C62-E 2012 vintage. |
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CDM and PRO-series Detailed Service Manual Ver: C 30.1 MB PDF This manual covers the Low band, VHF and UHF CDM and PRO series mobile radios. 6881091C63-C 2007 vintage. We also have the "B" version for those that are looking for it 16.9 MB PDF. |
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CDR500 Wall Mount
Repeater & CDR700 Desktop Repeater Service/Programming Manual 1.84 MB PDF 6864110R66-O 2001 vintage. Motorola used dual CDMs to replace the dual GM300s in the GR500 and renamed the box as the CDR500. Likewise the tabletop GR300 repeater became the CDR700. This manual was the guide to the field upgrade kits. NOTE: This manual has almost nothing on the internals of the CDM radios however it does have a lot of info on the interfacing to the CDMs, plus info on the various add-in controllers: the RICK (HLN3333), ZR310, i20R, ZR340, HPN9005, HKPN4000, HKPN4001 and the HKN9033. |
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CDM-series Remote Mount Kit RLN4801 & RLN4802
400 kB PDF 6864110B51-A 2002 vintage. These kits are the control head extension kits for all CDM-series and some CDM-based GM-series mobile radios. The RLN4801 is for the CDM750, the RLN4802 is for the CDM1250 and CDM1550 models. The kits DO NOT include the cable between the head and the radio - that must be ordered separately. The available cables are 3, 5 and 7 meters long (9.8 feet, 16.4 feet, and 22.9 feet. Page 3 of the PDF has the information. |
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CDM750 User Guide 1 MB PDF Not band specific. 6881091C54-A 2003 vintage. |
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CDM750 Specification Sheet 145 kB PDF Low Band, VHF and UHF. 2012 vintage. |
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CDM1250 User Guide 1.3 MB PDF Not band specific. 6881091C55-B 2003 vintage. |
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CDM1250 Specification Sheet 60 kB PDF Low Band, VHF and UHF. 2006 vintage. |
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CDM1550 Brochure 607 kB PDF VHF, UHF, 200 and 700 MHz. 2003 vintage. |
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CDM1550 User Guide 1.3 MB PDF Not band specific. |
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CDM Series Control Station
Service and Installation Manual 3.99 MB PDF This manual covers the Control Station (commercial base station) - a CDM in a box with a power supply. Not band specific. 6880309N15-A This manual has a section on interfacing the CDM to the Control Station Interface Module (CISM) – the CDM version of the R.I.C.K and that section can be useful in connecting the CDM to an external repeater controller. |
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Low Band CDM1550 Specification Sheet 90 kB PDF |
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"200" MHz CDM1550LS+ User Manual 6864110R13-O 2.85 MB PDF |
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CDM1550LS+ 200 and 700 MHz Basic Service Manual (6864110R16 - we don't have a copy yet) This manual covers both the 200 MHz (model AAM25MHF4DP5AN) and 700 MHz CDM1550 LS+ (model AAM255HF4DP5AN) radios. The "200" MHz model was the 25 watt 217-222 MHz CDM1550LS+ (model AAM25MHF4DP5AN) radio that was made only in narrowband and 12.5 KHz channel spacing. They didn't even install the wideband receive parts. It CAN be moved to the 219-225 MHz amateur band, but you will need to acquire wideband IF filters and swap them, and then do some software / firmware tweaks to move the band edges and enable 20 KHz spacing. Note that Motorola no longer stocks that exact wideband surface-mount filter (made by Murata) but it can be scavenged from a dead VHF or UHF hulk, or you can use a differently packaged but electrically similar unit. More info in the "CDM Notes" article above. |
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CDM1550LS+ 200 & 700 MHz Detailed
Service Manual 6864110R14-O 55.8 MB PDF This manual covers the 200 MHz (model AAM25MHF4DP5AN) and 700 MHz CDM1550 LS+ (model AAM255HF4DP5AN) radios. |
CDM Accessories:
This is what the spec sheets recommend:
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AARMN4025 Standard Compact Microphone (but your existing Maxtrac / Radius / GM300 microphone will work just fine) |
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AARMN4026 Enhanced DTMF Keypad Microphone This 12-button DTMF mic has a 10 pin plug and will not work correctly on anything but a CDM. |
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AARMN4038 Heavy Duty Microphone |
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AAREX4617 Telephone Style Handset with Hang-Up Cup This unit is also compatible with CM200/CM300/PM400 but is not for use with dual control heads. Includes RLN4756 Handset with Coiled Cord, NTN8378 Hang-up Clip, TRN5502 Mounting Bracket, HLN5549 Mounting Bracket Hardware |
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HMN3000B Desk Mike for control stations 3 MB PDF Of course this has been discontinued but was replaced by the RMN5068A. |
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RSN4001 13 Watt External Loudspeaker |
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HSN8145 7.5 Watt External Speaker |
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GLN7324 Standard Low Profile Bracket (VHF/UHF) This will not work on a low band CDM. |
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GLN7317 High Profile Mounting Bracket (VHF/UHF) This will not work on a low band CDM. |
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RLN4779 Key Lock Mounting Bracket (VHF/UHF) This will not work on a low band CDM. |
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CDR500 and CDR700 Accessories 93 kB PDF The wallmount CDR500 and desktop/tabletop CDR700 prepackaged repeaters were based on dual CDMs. The various items listed in this document are relevant to both the CDM radio and for the CDR500 and the CDR700. |
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CDM750, CDM1250, CDM1550 Parts Lists and Accessories 381 kB PDF |
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Originally this information was on the main Motorola Index page.
In October of 2016 Mike Morris WA6ILQ created a combined CDM / CM page.
The CM series material was relocated to its own page in October of 2021.
This web page, this web site, the information presented in and on its pages and in these modifications and conversions is © Copyrighted 1995 and (date of last update) by Kevin Custer W3KKC and multiple originating authors. All Rights Reserved, including that of paper and web publication elsewhere.
