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Welcome to MASTR2.COM The 'MASTR' Index of GE Conversion Information Maintained by Kevin Custer W3KKC

Over the last decade the company originally known as the Land Mobile Radio Division of General Electric Company has been sold several times. The names have included General Electric, Ericsson, Com-Net Critical Communications, M/A-Com, Tyco and now Harris. Just to keep things simple, and because GE was the company name at the time most of this equipment referenced below was manufactured, we are going to use the name GE exclusively on this page.

There are email lists / groups that cover GE radios. If you are at all serious about any of the GE radios I suggest that you join one or more of the groups.

For quick access to product-line-specific information you can use these in-page jumps:
Century II       Custom MVP       Delta       Exec II Info       Frequency Agility      
LBIs, Manuals and Technical Info       MASTR II Mobile and Station       MASTR II Mobile
MASTR II Station       MASTR II Miscellaneous       MASTR II 220 MHz Conversions
MASTR II Mobile Suppliers       MASTR III Station       MASTR Pro       MLS and MLS-II
Monogram       MPA       M-RK       MVS       PCS       Phoenix and Phoenix SX
RANGR       Test Sets and Tuning Tools       Trivia and Miscellaneous

We have very little information on the MASTR IIe, MASTR III or later series.
Would someone like to write an introductory article on any of them?

Manuals and Technical Information:

Currently stocked manuals can be ordered from the Customer Care Center at 800-368-3277 or call the Publications department directly at 434-832-6592.

	The "MASTR" list of LBIs     Over 6 Gigabytes of free downloadable GE Technical Manuals in PDF format, including LBIs, Datafile Bulletins, and Product Code Indexes. Contributions are welcome.
	Finding a Manual for a GE Mobile Radio    17 kB PDF file by Eric Lemmon WB6FLY
	List of Ericsson Technical Publications    3 MB PDF file This is a bunch of lists sorted by model name, LBI number, part number, etc. A great cross-reference to find other search terms.
	GE Technical Information    by Duane Hall of Hall Electronics (offsite link)
	The GE MASTR II email group    For people seeking information on GE MASTR II equipment
	GE Manuals from Ted Jansen    A good source for original GE manuals
	GE Part Number to Generic Part Number List    by Jim Cannon K7KL   48 kB PDF file A list that allows cross reference from original GE part numbers to generic part numbers for transistors, diodes, etc.
	GE Semiconductor Cross-Reference List    LBI-32595   700 kB PDF file Thanks to Gary Hendrickson W3DTN for pointing out that we had this information...
	GE Product Code Publication Indexes    compiled by Robert Meister WA1MIK - An alphabetical list of the various product code publication indexes
	Some Older M/A-COM Data Sheets    compiled by Robert Meister WA1MIK - A bunch of older (1982) M/A-COM data sheets for combiners, couplers, filters, etc.

Information applicable to both the MASTR II Mobile and Station:

	The GE MASTR II email group    For people seeking information on GE MASTR II equipment
	GE Crystal Information    by Doug Bade KB8GVQ   470 kB PDF file This is a PDF of all GE crystal formulas that were in the Service Parts Book.
	Basic GE MASTR II ICOM information    Basic differences between EC, 5C and 2C (with pictures).
	GE MASTR II ICOM information    A comprehensive page on GE ICOMs from Hall Electronics.
	GE ICOM information from International Crystal Manufacturing Company, Inc.
	Why should you spend more money to have a channel element or ICOM temperature compensated?    by Kevin Custer W3KKC
	Playing with the 5C ICOM    How it works, voltage analysis, and more - by Robert Meister WA1MIK
	A schematic of the exciter audio "blob"
	A cleaner schematic of the exciter audio "blob" above    Redrawn by Robert Meister WA1MIK
	A MASTR II S-Meter Circuit    by Andy Kadvan KA8R from an old issue of ACC notes (see this note at the ACC page at this web site)
	A crystal frequency calculator for the MASTR II    A downloadable Excel spreadsheet from John M. Kester KD6FVA
	Squelch modification for the MASTR II    by Kevin Custer W3KKC and Scott Zimmerman N3XCC A modification for making the MASTR II squelch work better.
	Installing a TS-64 into a MASTR II station    A photo article based on original information from Doug Sharp K2AD
	GE MASTR II Bandsplit Modification    by Matt Lechliter W6XC / W6KGB Converting a 450-470 MHz radio to 420-440 MHz.
	MASTR II VHF and UHF Local Oscillator Injection "Side" Explanation    by Kevin Custer W3KKC
	Help!! My UHF MASTR II self quiets after conversion    by M. Scott Zimmerman N3XCC
	Help, my MASTR II has lost receiver sensitivity!    Some MASTR II front end helical castings grow internal whiskers and short themselves out!
	MASTR II intermittent sensitivity    by Joe Szczech, Jr. K1IKE - An issue with MASTR II front end helical coils that break loose from the casting.
	MASTR II I-F alignment procedure    by Patrick M. Conway WA6JGM - IF alignment for MASTR II, Executive II, and Custom MVP radios.
	Identifying UHF PA deck internal components    A table of assembly numbers that will help identify the UHF PA assemblies.
	Identifying UHF PA deck components    A table of part numbers that will help identify what range a PA deck was made for.
	A GE Technical Services Memo on substituting the UHF PA transistors    Donated by Darrell Manning KI4BST   96 kB PDF file This writeup explains how to use Motorola MRF646s in the four-transistor UHF PA.
	GE power amplifier reliability, and the Z-Matcher    A guide to why earlier GE PAs can fail when used with reactive loads like a cavity or duplexer.
	How the MASTR II was developed    A behind-the-scenes photo essay.
	Any time I see someone complaining they are unable to get rated sensitivity from a 150.8 to 174 MHz MASTR II receiver, I find the fix is usually correcting a low Local Oscillator injection level. The easiest way to insure you get good sensitivity when using a commercial split receiver on 2M is have the crystal company build a crystal for high-side injection. This allows the local oscillator and multiplier chain to work inside its intended range without changing any components. Otherwise, if you have a low-side injection crystal you'll have to do some mods to get the injection level up. It's a lot easier to just use high side injection.

MASTR II Station Conversion Information:

	Note: ICS makes a few useful items for the Mastr-II station, including an extender card for the card cage. Look here: https://ics-ctrl.com/mastr-ii.
	If your station conversion involves changing from from carrier to tone squelch (or digital tone squelch), or from tone squelch (or digital tone squelch) to carrier squelch then you need to change several jumpers inside the radio AND on the 10 Volt DC regulator card.   Don't forget the regulator card jumpers! If you do, you will be chasing your tail for days!
	The NHRC-M2/SC Repeater Controller Interface Board for General Electric MASTR II Stations from NHRC A really handy board that plugs into the GE station card cage. (Offiste link)
	GE MASTR II Station Conversion Info    by Ralph Hogan W4XE (offsite link) Some writeups that Ralph Hogan W4XE put together.
	MASTR II Station to Repeater Conversion    by Don Woodward KD4APP
	GE MASTR II Station Power Supply Safety Note    by John Holden N7IQV You'll want to read this writeup on how to fix a serious design / manufacturing error.
	Comprehensive modification to the MASTR II 10 Volt Regulator Card for duplex (repeater) operation    by Kevin Custer W3KKC
	How to add a PTT disable switch to a MASTR II 10 VDC Regulator / Station Control Module    by M. Scott Zimmerman N3XCC
	Another take on the above that uses a single switch for both forced transmit and transmit disable    by Chuck Kelsey WB2EDV
	Pion & Simon Electronics    MASTR II Station Controllers that plug right into the GE card cage! Unfortunately they are going out of business at the end of 2016 but all the support information is here on repeater-builder.
	Interfacing the MASTR II Station to an ACC 850 Repeater Controller    315 kB PDF file Developed by the folks at ACC, scanned from an old issue of the ACC Notes.
	Interfacing a GE MASTR II Repeater to an S-COM 5K/7K controller    18 kB PDF file This procedure also works fine on an Scom 7330, just adjust for the connector pin differences. Another take on interfacing the 7330 is here (at the Scom web site).
	Oscillator / Multiplier modification for the VHF MASTR II    by Jeff DePolo WN3A and Kevin Custer W3KKC A modification for improved 2 meter sensitivity.
	Comments on the GE MASTR II Station Power Amplifiers, and why they die    by Fred Seamans W5VAY
	An experience repairing a GE MASTR II 100w UHF Power Amplifier    by Robert Meister WA1MIK
	Repairing the GE MASTR II Station Power Amplifier    by Ray Vaughan KD4BBM If you are looking for the "omega mod" or the "inchworm mod" this is the page you are looking for.
	Using the 40-50 MHz 50-100 watt PA as a Linear Amplifier    by Chuck Schreiber K9VPE
	A photo of the intermittent and continuous MASTR II RF Power Amplifier heat sinks
	LBI-31056 Version G    Manual for the 19D432500G1 / G2 / G3 standard 10-bit dip-switch style Channel Guard board.   635 kB PDF file. Here is the tone table Click here to see a photo showing where the Channel Guard boards are placed in the station. The 10-bit dip-switch style Channel Guard encode-only board (19C331044G1) is here: LBI-31123 Version B   433 kB PDF file.
	GE made a proto-board, or perf-board, that was designed to plug into the control shelf. If you can find a source, you want to locate part number 19D417941G1. It's very useful - even if all you want to do is make up a paddle board for connecting external equipment to a base or repeater. This board from NHRC is much more readily available.
	Product Code file #S3 - cracking the combination number on the later generation MASTR II Station cabinet    This is a "Rosetta Stone" document that will help you figure out what you have.
	Product Code file #67 - cracking the combination number on the earlier generation MASTR II Station cabinet    This is a "Rosetta Stone" document that will help you figure out what you have. If your station was shipped with multiple receivers you will need Product Code file #75 If your station started out life as an IMTS station you will need Product Code file #22

MASTR II Mobile Conversion Information:

	Step-By-Step GE MASTR II Mobile Duplex Conversion    by Kevin Custer W3KKC
	GE MASTR II Mobile Conversion Information page    by Kevin Custer W3KKC
	Custom Built MASTR II Mobile and Station Repeater Conversions    from Scott Zimmerman N3XCC
	GE MASTR II Mobile 6-meter Conversion    by Samuel Korin W2GBO Originally written in 1994 and revised in 1998, this is a step-by-step conversion for making the low-band mobile radio work properly in the 50-54 MHz range.
	NHRC Repeater Controllers made just for the GE MASTR II    by NHRC, Simply plugs in! (offsite link)
	GE MASTR II Infosite    by Jeff Otterson, and NHRC. (offsite link)
	Oscillator/Multiplier modification for the VHF MASTR II    by Jeff DePolo WN3A and Kevin Custer W3KKC - A mod for improved 2 meter sensitivity.
	FM'ing the Phase Modulated MASTR II    by Jeff DePolo WN3A - Converting the PM MASTR II to true FM Modulation
	MASTR II Mobile Power Amplifier considerations for reliability    by Ray Vaughan KD4BBM
	The elimination of spurious emissions in early MASTR II VHF PA decks    by George Burton K7WWA
	MASTR II UHF mobile modifications    by Paul Lorona KB6MIP (offsite link)
	An informative writeup on GE MASTR II cables with part numbers, and connector repair info. 100 kB PDF file.
	W4XE's MASTR Professional and MASTR II Information    (offsite link)
	NW6H and WB6ZSU's MASTR II to TNC Connection Chart    (offsite link)
	Product Code file #61 - cracking the combination number on the standard MASTR II mobile housing This is a "Rosetta Stone" document that will help you figure out what you have. Product Code file #65 Click here for a photo of an "E" housing. If your mobile radio has dual front ends you will need Product Code file #69

MASTR II Miscellaneous:

	How to remove the second front end in a dual front end (DFE) mobile    by Scott Zimmerman N3XCC
	Painting a GE MASTR II Mobile With Paint That Almost Matches...    by Phil Heck KE3EI
	Duplex Isolation Curves for highband TX with PM vs. PLL exciter (from GE)    103 kB PDF file provided by Jeff DePolo WN3A and Dave Karr KA9FUR
	Converting a MASTR Executive II and a MASTR II to 900 MHz    1.4 MB PDF file by Gene Colson W7UVH from CQ VHF June 1999
	Another scan of the 900 MHz MASTR Executive II and MASTR II article    217 kB PDF file by Gene Colson W7UVH

MASTR II Highband to 220 MHz Conversions:

	A definitive guide to GE MASTR II 220 Rx conversions    by M. Scott Zimmerman N3XCC
	Conversion of Highband PLL Exciter to 222 MHz    by Rob Mang K2ROB
	WB6RHQ's Highband MASTR II to 222 Modifications    From Southern California's Condor Connection (offsite link)
	The Condor Connections Highband MASTR II to 220 MHz Modifications    (offsite link)
	An Excel spreadsheet to assist in crystal calculations for the 220 MHz MVP conversion
	How to modify a VHF UHS factory preamp for use in the 220 band    by Scott Zimmerman N3XCC
	MASTR II 220 MHz Repeater Conversions from Repeater Builder - the company    222 MASTR II conversions from Scott Zimmerman N3XCC

MASTR II Mobile Suppliers:

Hamblin Communications    Supplier of GE MASTR II mobile radios and parts

MASTR Executive II Information:

	Adding CTCSS (Channel Guard) encode/decode to the MASTR Executive II    55 kB PDF file by Stewart Rabinowitz KE5UT
	GE MASTR Executive II Modification and Information Site    by Ray Vaughan KD4BBM (offsite link)
	Product Code file #05 - cracking the combination number on the standard MASTR Executive II station    This is a "Rosetta Stone" document that will help you figure out what you have. Executive II mobiles are covered by Product Code file #06    (Combination Numbers starting with "R" or "S" followed by "X" or "T" followed by "4" or"5"). High power Executive II mobiles are covered by Product Code file #13    (Combination Numbers starting with "R" or "S" followed by "X" or "T" followed by "6" or"7"). RCC and IMTS mobiles are coverd by Product Code file #18    (Combination Numbers starting with "CC", "XC", "YC", "CS", "XS" or "YS"). Executive II-based Mobile Repeaters are covered by Product Code File #82    (Combination Numbers starting with "MVR", "EVR", "DVR", or "RVR").
	MASTR Executive II VHF mobile modifications    by Paul Lorona KB6MIP (offsite link)
	MASTR Executive II VHF mobile to repeater conversion   2.5 MB PDF by Michael Mullikin W8EHH
	MASTR Executive II Low-band exciter mods for 6 meters   645 kB PDF by Ron Wright N9EE
	MASTR Executive II UHF 40w Power Amplifier modifications    135 kB PDF file by Harold Reasoner K5SXK Improves operation in the 420-440 MHz range. (Originally a powerpoint presentation.)
	Executive II I-F alignment procedure    by Patrick M. Conway WA6JGM - IF alignment for MASTR II, Executive II, and Custom MVP radios.
	Running D-STAR on a MASTR Executive II radio    by Ron Wright N9EE. D-STAR is added to a mobile radio that has been converted to a full-duplex repeater.

MASTR Professional Information:

	Product Code file #31 - cracking the combination number on the MASTR Professional mobile housing    This is a "Rosetta Stone" document that will help you figure out what you have.
	Product Code file #32 - cracking the combination number on the MASTR Professional Station cabinet    This is a "Rosetta Stone" document that will help you figure out what you have.
	KA1OKQ's Modification of the MASTR Professional ER41C VHF receiver to 220 MHz (offsite link)
	W4XE's MASTR Professional Page (offsite link)
	Modify an ER42 UHF receiver for 220 MHz    1.2 MB PDF file by Gary Hendrickson W3DTN. Provides instructions that cover both the 406-420 and 450-470 MHz units.
	4ET55 6-meter Problem Solved    540 kB PDF file by Jon Dahm WB5PCV.

MASTR III Station Information:

	Product Code file #SX - cracking the combination number on the standard MASTR III station This is a "Rosetta Stone" document that will help you figure out what you have.
	The MASTR III Station programming cable is a straight-through DE-9 serial cable. Connect either to the Data Port on the front of the repeater or the DE-9 connection on the rear of the interface board.
	Thoughts on MASTR III to ham conversion    by Paul Robertson N2XZF
	GE MASTR III Module Number Band Decoder Chart    by Matt Krick K3MK
	Converting the GE VHF MASTR III 150-174 MHz Repeater to 144-148 MHz Amateur Operation    by Matt Krick K3MK
	Converting the GE UHF MASTR III 403-430 MHz Repeater to 440-450 MHz Amateur Operation    by Matt Krick K3MK
	Interfacing External Repeater Controllers to GE MASTR III Stations    by Matt Krick K3MK
	MASTR III Station Parts and Accessories Quick Reference Guide    1.8 MB PDF file by Matt Krick K3MK

Delta Information:

	Anybody want to contribute Delta, Delta S, or Delta SX photos? (exterior and interior) Or any additional manuals?
	GE Delta-S and Delta-SX Specifications Sheet    848 kB PDF scanned by Jon Cereghino
	GE Delta Radio Sales Brochure    500 kB PDF scanned by Jon Cereghino
	GE Delta Information    by Dave Kaar KA9FUR (offsite link) Converting and programming the Delta series radio.
	Supplemental GE Delta Information    by Mike Morris WA6ILQ
	Len Kreyer can program Delta radios. Contact him via e-mail.

RANGR Information:

	Anybody want to contribute some photos? (exterior and interior)
	Anyone what to do an overview article?
	GE RANGR VHF-hi and UHF Specifications Sheet    477 kB PDF scanned by Jon Cereghino
	GE RANGR VHF-lo and 800 MHz Specifications Sheet    182 kB PDF scanned by Jon Cereghino
	Converting the low-band GE RANGR to 6 meters    by Gary L. Peterson, NZ5V (a work in progress) When using the TQ2310 Suitcase Programmer (LBI-31229) to program RANGR radios refer to LBI-31630.
	Len Kreyer can program RANGR radios. Contact him via e-mail.

MLS and MLS-II Information:     (also referred to as the MLS-1 and MLS-2)

	An Overview of the MLS Mobile Radio by Robert Meister WA1MIK. Comparison with the GE MLS-II models. Photos, features, etc. Please read the MLS-II Overview (below) first.
	Using MLS Mobile Radios in Repeater Service by Robert Meister WA1MIK. Details of where you can find the required signals for almost any repeater controller.
	VHF-hi MLS Radio circuit board X-ray views from the various LBIs scanned by Robert Meister WA1MIK. 1.5MB PDF file. After acquiring an excellent quality, original, complete Combination Maintenance Manual: LBI-31764A, I scanned the X-ray view pages in glorious color. Eric WB6FLY scanned all the LBIs (LBI-31756A, LBI-31766A, LBI-31767, LBI-31765A) to gray-scale PDF files and these can be retrieved from the LBI Library.
	An Overview of the MLS-II Mobile Radio by Robert Meister WA1MIK. Model numbers, comparison with the Motorola MaxTrac radios, photos, features, etc.
	Replacing MLS-II Mobile Radio Power Supply Caps by Robert Meister WA1MIK. If your radio has an annoying 100 Hz hum coming out of the speaker all the time, this may be the fix for it.
	Using MLS-II Mobile Radios in Repeater Service by Robert Meister WA1MIK. Details of where you can find the required signals for almost any repeater controller.
	MLS/MLS-II Accessory Connector Issue by Robert Meister WA1MIK. You can easily insert an accessory connector wrong, which could be disastrous. This article provides an inexpensive fix to the problem.
	MLS/MLS-II Mobile Radios Secrets by Robert Meister WA1MIK. The MLS requires a TQ2310 suitcase programmer, which is rare and hard to use. However there are alternatives. This article explains the layout of the personality data stored in the radio's EEPROM, so if you have an EEPROM burner you should be able to successfully modify the data and reprogram the radio.
	TQ2310 Programming Instructions    1 MB PDF file This is the instruction manual for the MLS programming software found in the TQ2310.
	TQ3342 Programming Software Guide    2.2 MB PDF file This is the instruction manual for the MLS-II programming software, direct from Ericsson. A more readable version can be found on the LBI Master List.
	MLS-II Major Parts Breakdown    840 kB PDF file From 1998. Of course most of these items are No Longer Available.
	The MLS radio can be forced to always be in the "ON" condition by adding a small jumper wire across the Power On relay's contacts or the SysCon1 connector pins 1/2 to pins 3/4. See the "Using MLS Mobile Radios in Repeater Service" article above for more details.
	The MLS-II radio can be forced to always be in the "ON" condition by adding a small jumper wire from the incoming A+ terminal to the input (left) pin of IC501, the AN1541 9V regulator chip on the board where the DC power cable enters the radio. This tip is courtesy of Allan Perrins WB6PHE. See the "Using MLS-II Mobile Radios in Repeater Service" article above for more details.
	I discovered that M4.7x12mm screws fit the threaded mounting holes on the sides of the radios. M3.5x6mm and M3.5x10mm screws fit the threaded circuit board mounting holes inside the radios.
	Len Kreyer can program MLS and MLS-II radios. Contact him via e-mail.
	Repeater-Builder does not have any programming software. It can probably be found "out there" on the web; better yet, ask on the the GE mailing list. From a private email: GE had a problem with electrolytic capacitors failing and leaking, especially in mobiles in hot parts of the country (like southern Texas in the summer). Many GE mobiles (including the MLS series) had several electrolytic capacitors on the front panel boards. When these leaked the corrosive electrolyte would eat up the copper traces, including the copper plating in the pass-through holes in the PC boards (the plating in the holes was too thin). In most cases the boards were just replaced. The traces on the boards could be repaired with 30 or 32 gauge wire soldered onto what was left of the traces but the only cure for the plated-through holes was to insert a piece of thin wire in each plated hole and solder both sides. When you replace the caps you will probably want to use caps with a 105C temperature rating.

MPA Information:

Anybody want to contribute a few photos? (exterior and interior) and some information on the series?

How to Use the M-PA Radios on the 902-928 MHz Amateur Band    168 kB PDF file by Mark A. Cobbeldick KB4CVN This is a compilation of the experiences of long-term efforts by several hams, including: Doug Bade KD8B (Creator of the modified software to support 902-928 MHz and dozens of hours of testing), Gary Peterson NZ5V (Reviewing the data and testing methods) and John Belstner W9EN. This information applies equally to the following radios: M-PA, MTL and P400. The GeNet 900 model of the MTL is not supported due to the modem/clock differences.

M-RK Information:

	Anybody want to contribute a few photos? (exterior and interior) and some information on the M-RK series?
	A schematic of the M-RK programming cable

MVS Information:       Front panel photo

	Anybody want to contribute a few more photos? (exterior and interior)
	VE3FYN has some information here. (offsite link)
	KD4BBM has some notes on the MVS as well (offsite link)
	Ralph Hogan W4XE has some good MVS notes, some photos, interfacing information and pointers. (offsite link)
	Converting a VHF MVS radio to 220 MHz    7.6 MB PDF file by Matt Krick K3MK
	Supplemental MVS Information    by Mike Morris WA6ILQ

Century II Information:

	Anybody want to contribute a few photos? (exterior and interior)
	Anyone what to do an overview article?
	GE Century II highband to 2 meter conversion    Converting the highband Century II to the 2 meter ham band

Custom MVP:

	Step By Step GE Custom MVP Conversion Site    by Kevin Custer W3KKC
	GE MVP Bandsplit Modification    by Matt Lechliter W6KGB
	MVP to Repeater Conversion    by Bob Dengler NO6B
	Installation instructions for Parkinson RP3A Repeater-Controller with GE UHF MVP mobile radio    580 kB PDF file
	WB6RFW's GE MVP Radio Modifications (offsite link)
	A VHF MVP/Executive II 222 MHz Conversion    From Southern California's Condor Connection. (offsite link)
	UHF MVP TX and RX Tuning Instructions    by Bob Dengler NO6B
	Tune Up Instructions for the MVP and MASTR Executive II     VHF Receiver   and   VHF Exciter   and   UHF Exciter
	Custom MVP I-F alignment procedure    by Patrick M. Conway WA6JGM IF alignment for MASTR II, Executive II, and Custom MVP radios.
	Some GE MVPs have shown up with a controller board made by Parkinson inside the case. The system manual is LBI-32772a 242 kB PDF file and the board manual is LBI-32792 749 kB PDF file.
	Custom MVP Mobile Repeater Conversions from Scott Zimmerman N3XCC   GE conversions from Repeater Builder (the company).
	Temperature Compensation Capacitor information for 5C ICOMs    13 kB PDF file provided by Chuck WB2EDV
	Converting a UHF 20/35w MVP PA to 5 watts for link transmitter use    by Doug Crompton WA3DSP
	Regarding UHF units: While there are duplex conversions of the MVP that will enable its use as a repeater or as a link radio, please understand that the MVP was designed as a 5, 20 or 35w mobile, and the trnasmitter was designed for an intermittent duty. The 35w version has all three RF power amplifier stages (the pre-driver, driver and final), the 20w has two (the pre-driver and the driver), and the 5w has only one stage (the pre-driver). A common modification is to take a heat sink intended for a Pentium 3 or 4 CPU and adapt it to the back of the radio. Even the driver transistor gets hot and needs additional heat sinking. So if you intend to run an MVP with any kind of duty cycle (i.e. as a link or as a repeater) you really need to add a heat sink with a fan. And use a real metal ball bearing fan, not a brass or plastic sleeve or bushing fan.

Monogram Information:

	Programming the Monogram and Maxon mobile radios    by Scott Lichtsinn KBØNLY
	Maxon SM-4450 UHF Synthesized Mobile Radio Service Manual    19.8 MB PDF file courtesy of Don K8ZGW This radio is identical to the GE Monogram series; it just has a different name.
	We have zero info on the Monogram series other than at least one of them was a rebranded Maxon SM4000 series radio. If you have one of these then look on the web for the Maxon SM4000 series information and programming software.

PCS Information:

	Anyone want to do an overview article?
	Converting a VHF PCS radio to 220 MHz    1.8 MB PDF file by Matt Krick K3MK

Phoenix and Phoenix SX Information:

	Phoenix squelch-controlled audio amplifier    15 kB PDF file by John J. Riddell VE3AMZ Originally used for a packet interface, this general-purpose LM386 amplifier uses a novel gating feature.
	Phoenix remote channel selection modification    by Joel Huntley WA1ZYX. (offsite link)
	Interfacing the Phoenix to a packet TNC    by Ray Vaughan KD4BBM (offsite link) While the article is packet oriented, the info will be useful to anyone that needs to interface a Phoenix to a repeater controller - as a control receiver, point-to-point link, remote base, whatever.
	KG4LNE's Phoenix Resources Page    by Robert Starr KG4LNE (offsite link) When using the TQ2310 Suitcase Programmer (LBI-31229) to program Phoenix radios refer to LBI-31262.
	Len Kreyer can program Phoenix radios. Contact him via e-mail.
	The screws that are used to hold the mounting bracket to the radio housing are metric, M4-0.7x10, which translates to M4 diameter, 0.7mm thread pitch and 10mm (1cm) long. Thanks to Tedd Doda, VE3TJD for the info.
	Anyone want to do an overview article?

Frequency Agile Modifications for Commercial Radios:

GE Phoenix, RANGR, Delta, and Ramsey FX Series    by Joe Burch K3JLS (offsite link)

Trivia, Miscellaneous Information, and Datasheets:

	GE MASTR Trivia Question    by Mark A. Cobbeldick KB4CVN
	Shure 890TT mobile DTMF microphone    975 kB PDF file Also goes by M/A-Com model numbers 344A4611P1, KRY1011637/3, KRY1011654/10. Possibly for the Orion product line.
	Radio Service Training Seminar (1969)    938 kB PDF file General procedures for testing and measuring mobile radio performance. While primarily aimed at older (tube) equipment, the techniques are equally useful for today's modern radios.
	GE C800 and C900 Control Heads Sales Brochure    3.3 MB PDF file 1977 vintage MASTR II and Executive II Mobile Radios.
	GE Two-Way Radio Products Line Sales Brochure    9.6 MB PDF file Includes the Progress Line, Paging and Selective Call, and Mobile Telephone. 1960s decade.
	GE MASTR Executive II Sales Brochure and Specs    3.1 MB PDF file. 1978 vintage.
	GE MASTR Base Station and Control Equipment Sales Brochure    3.9 MB PDF file. 1978 vintage.
	GE MASTR Executive II VHF Base Station Specs    2.1 MB PDF file. 1978 vintage.
	GE Power Call and Power Call/Siren Sales Brochure and Specs    2.5 MB PDF file. 1977 vintage.
	GE MASTR Remote Control Consoles Sales Brochures and Specs    3.9 MB PDF file. 1978 vintage. Includes Tone and DC remotes, DESKON II, and Command Control Centers.
	GE MASTR PE Personal Radio Sales Brochures, Part 1 of 2    3.1 MB PDF file. 1978 vintage. Includes MPR, MVP, Porta-Mobile II, and accessories.
	GE MASTR PE Personal Radio Sales Brochures, Part 2 of 2    3.2 MB PDF file. 1979 vintage. Includes MASTR Personal, MASTR MVP Personal, Accessories, POWR MASTR add-on power amplifiers, MPR Personal.
	GE MASTR II mobile radios Sales Brochure and Specs    2.8 MB PDF file. 1978 vintage. Includes MASTR II M, MASTR II E.
	GE MASTR II repeater and base stations Sales Brochure and Specs    1.3 MB PDF file. 1978 vintage. Includes MASTR II M, MASTR II E.

Test Sets and Tuning Tools:

Information on GE Test Sets and Tuning Tools   by Mike Morris WA6ILQ

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All of the GE radio models mentioned on this page are most likely registered trademarks of General Electric / Ericsson / Com-Net Critical Communications / M/A-Com / Tyco / Harris.
GE image used with permission.

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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.