Back to Home   Welcome to MASTR2.COM The'Mastr' Index of GE Conversion Information    
General Electric / Ericsson / Com-Net Critical Communications / M/A-Com / Tyco / Harris (whatever their name is this month) Radios

Over the last several years 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. To keep things simple on this page we are going to use the name GE.

There are three mailing lists that cover GE radios. The first, YahooGroups GE, covers anything GE, the second, YahooGroups GE-MastrII covers just the Mastr-II series, and the third is for the Mastr-III series.

If you are at all serious about any of the GE radios I suggest that you join one or more of the mailing lists.

For quick access to model-specific information use these in-page jumps:
      Test Sets and tuning tools       Mastr II Mobile and Station       Mastr II Station       Mastr II Mobile
Mastr III Station       Mobile Suppliers     Exec II Info      Mastr-Pro     Delta      Rangr      MLS
MPD      MPA      M-RK      MVS      Century II       Custom MVP       Monogram
Phoenix & Phoenix SX       Frequency Agility       Technical Info, LBI's & Manuals
      220 MHz Conversions       Trivia & Misc.

We have very little information on the Mastr IIe or III series - would
someone like to write an article or two on them?

The Standard GE Test Set
Yes, you can tune up a radio with just a VOM, but after you get a chance to use a real GE test set (or look over someone's shoulder as they use one) you will want one. The same test set (with different cable kits, see below) can be used on Mastr IIs, Exec IIs, Execs, MVPs, Mastr-Pros, Deltas, Rangrs, PortaMobiles, and several other radio series.

   
The 4EX3A11 test set
Click on this link to go to a another web page that includes additional photos, including larger versions of the above.
An MVP-style microphone plugs into the left side of the test set, and the older round connector microphone plugs into the right side, as does the test cable to the radio.
Eventually the red PTT button wears out and will need replacing. One common mod (while you have the housing open) is to add a SPST mini-toggle wired in parallel with the button. This allows you to use the red button for momentary PTT, and the switch when you want to key the transmitter for longer periods or when you need use both hands for something else. One friend added a 1/8 inch jack to his, wired across the PTT button and wired a external foot switch to a matching plug.

If you are only going to test Mastr II, Mastr Executive II, or Custom MVP radios, then you can use the 4EX8K12 test set kit (LBI4436) which came in a smaller box and with permanently-attached red and black test cables (would anybody like to shoot a similar set of photos for us?). The Model 4EX3A10 test set (LBI3491E) or 4EX3A11 test set (LBI-4454B) has a connector on the side for the radio-specific cables. The meter circuitry in the 4EX8K12 is identical to the meter circuitry in the 4EX3A10 or 4EX3A11.

All three test sets used a specially made analog meter calibrated as a -1/2 volt to +3 volt movement, and the entire meter box was configured as a 20,000 ohms-per-volt voltmeter. There are two good reasons for this:
1) ALL of the metering points on radios of that era were configured to use a 20k-ohms-per-volt meter, and the measurement circuit uses the input resistance of the test meter as part of a series circuit. Without a load of the correct value none of the metering readings were meaningful.
2) There were no inexpensive portable DVMs when these radios were being designed - every two-way tech had a portable VOM (a Simpson 260, a Triplett 630 or the WW2 surplus military equivalent), and all were 20K-ohms-per-volt. Modern DVMs have a input impedance that ranges from 2 to 11 megohms (depending on the manufacturer and model, most are 11 meg) and without the proper 20k-ohms-per-volt load none of the book measurement values will be correct.

In other words, YOU CANNOT USE A MODERN DVM TO PROPERLY TUNE A PRO, EXEC, EXEC II or MASTR II.

Two additional "gotchas" are that most inexpensive DVMs go crazy in the presence of RF energy due to the fact that they are sold by price, so to make a profit the manufacturers scrimp on the shielding, and lastly, in every case you are tuning for a peak or a dip - attempting to do that with dancing numbers on a DVM is an exercise in frustration - you are constantly trying to determine if the new number is higher or lower than the last number and your brain can't keep up with the DVM display update rate. You NEED an analog needle meter to see the peak or dip (and some of the peaks and dips are 'way too small).

The three links in the text above will download the manuals for the 4EX3A10, 4EX3A11 and 4EX8K12 test sets.

Additionally, here are the schematics for the 4EX3A10 and 4EX3A11 metering cables for various radios:
Porta Mobile, Mastr-Pro and Exec     74 kb
Mastr II, Exec II and MVP     68 kb
Delta mobile     84 kb
Metering cables parts list    40kb
With the information from the above LBIs you could design a 4EX3A10 and 4EX3A11 metering cable for almost any radio... even a Micor.

Tuning Tools

A while back there was a question on the GE Mastr II mailing list about which tuning tool(s) were the best for working on Mastr IIs and MVPs. Eric Lemmon WB6FLY responded with: "All of the tuning adjustments on the Mastr II are handled by the Micor "Universal Tuning Tool" part number 6684387C01, priced at about $5.50 (in early 2007) from Motorola Parts. This handy tool has a thin steel blade on one end that mates with the ICOM and front-end capacitors, and both 0.075" and 0.100" hex drives on the other end. Most coils on Mastr II radios require the 0.075" tool, but a few coils on the RF assembly require the 0.100" tool. The body of the Micor tuning tool is large enough to get a good grip, making it easy to make very small adjustments. Overall, it's a must-have tool !
Update: an email to repeater builder advised us that two tools were purchased in early May of 2009 and cost US$19.82 (including shipping).

Mastr II Mobile and Station Conversion Information:

The GE Mastr II email list server      For people seeking information on GE Mastr II's
GE Crystal Information       A 12 page PDF file about 500kb, by Doug Bade KB8GVQ
This is a PDF of all GE crystal formulas 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      Everything you wanted to know about the GE ICOM's     (Hall Electronics offsite link)
A schematic of the exciter audio "blob"     Donated by A. Nony Mous
A Mastr II S-Meter Circuit     By Andy Kadvan KA8R from an old issue of ACC notes (see the ACC page at this web site)
A crystal frequency calculator for the Mastr II     By John M. Kester KD6FVA
Squelch modification for the Mastr II      A modification for making the Mastr II squelch work better by Kevin Custer and Scott Zimmerman
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 W6KGB
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
Identifying UHF PA deck components      Donated by A. Nony Mous
A table of part numbers that will help identify what range a PA deck was made for.

Mastr II Station Conversion Information:

Product Code file #S3 - cracking the combination number on the later generation Mastr II Station cabinet      158 KB PDF
This is a "Rosetta Stone" document that will help you figure out what you have when you have a Combination Number that starts with "S3" followed by a "D", "S", "P" or "V" followed by an "O" or a "C". The first page is the translator for the combination number. The second page will help you determine which LBIs are the "top level" ones for your station, and from them you can find all the lower level LBIs. From those you can build up a complete manual identical to what was shipped with the station.
Product Code file #67 - cracking the combination number on the earlier generation Mastr II Station cabinet      302 KB PDF
This is a "Rosetta Stone" document that will help you figure out what you have when you have a Combination Number that starts with "D", "S", "P" or "V" followed by an "O" or a "C". The first page is the translator for the combination number. The second page will help you determine which LBIs are the "top level" ones for your station, and from them you can find all the lower level LBIs. From those you can build up a complete manual identical to what was shipped with the station.
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.
GE Mastr II Station Conversion Info      from Joseph Hogan W4XE      (offsite link)
An index of some writeups that Joseph Hogan W4XE put together for the Northern Alabama Repeater Association. Topics include Mastr II station Basics (includes a photo tour, is well worth reading!), the IDA Panel, battery backup, Polyphasers, CAS and RUS buffering, and repeater transmitter CG tone encoder.
Mastr II Station to Repeater Conversion      By Don Woodward  KD4APP
GE Mastr II Station Power Supply Safety Note      By John Holden N7IQV
If you are running a "real" GE factory supply you need to read this writeup on how to fix a design / manufacturing error.
How to add a PTT disable switch to a Mastr II 10vDC 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   (with photos)      By Chuck Kelsey WB2EDV     
Pion & Simon Electronics      Mastr II Station Controllers that plug right in!     
Interfacing the Mastr II Station to an ACC 850 Repeater Controller      3.15 Mb PDF file.   Scanned from an old issue of the ACC Notes, developed by the folks at ACC
SCOM 7K Controller Connections to Mastr II      An off-site link to a PDF at the Scom web site - Scroll down to the "Getting the most from your S-COM products" section
Comments on the GE Mastr II Power Amplifier, and why they die      By Fred Seamans W5VAY
An experience repairing a GE Mastr II 100w UHF Power Amplifier      By Robert Meister WA1MIK
This is the manual for the 19D432500G1 / G2 / G3 standard 10-bit dip-switch style Mastr-II Channel Guard board - LBI-31056 Version G
Additionally, as a shortcut, here is the tone table (see the lower right corner)     123 KB (note that "X"-marked bits are the open switches!)
Notes:
1) The G1 board is the encode-decode board,the G2 is encode-only, G3 is decode-only.
2) The brand of dip switch that GE used is notorious for not making contact the first time they are closed after being open for a while.   If you place one of these boards in service and change the tone and it doesn't seem to "take", rock each individual switch that you changed a couple of dozen times or so and check the tone again.

Mastr II Mobile Conversion Information:

Product Code file #61 - cracking the combination number on the standard Mastr II mobile housing      215 KB PDF
This is a "Rosetta Stone" document that will help you figure out what you have when you have a Combination Number that starts with "M", followed by a "C" or an "X". The first page is the translator for the combination number. The second page will help you determine which LBIs are the "top level" ones for your radio, and from them you can find all the lower level LBIs. From those you can build up a complete manual identical to what was shipped with the mobile.
If your mobile radio is in a double-high housing (where the Combination Number starts with "E", followed by a "C", "X", "J" or a "Y", sometimes called the "E" series) you will need Product Code file #65.
If your mobile radio has dual front ends you will need Product Code file #69.
Step-By-Step GE Mastr II® Mobile Conversion Site      by Kevin Custer W3KKC
Custom Built Mastr II Mobile & Station Repeater Conversions      from Scott Zimmerman N3XCC
NHRC Repeater Controllers made just for the GE Mastr II      By NHRC, Simply plugs in!
GE Mastr II® Infosite      By Jeff Otterson, and NHRC     (offsite link)
Oscillator/Multiplier modification for the VHF Mastr II      A mod for improved 2 meter sensitivity by Jeff DePolo and Kevin Custer
FM'ing the Phase Modulated Mastr II      Converting the PM Mastr II to true FM Modulation by Jeff DePolo WN3A
Mastr II Mobile Power Amplifier considerations for reliability      Modifying the Mastr II PA by Ray Vaughan KD4BBM
GE Tech Memo on replacing the output transistors in a Mastr II UHF      By David Hopper WD4JKH
The elimination of spurious emmissions in early Mastr II VHF PA decks      By George Burton K7WWA
An informative writeup on GE Mastr II cables, with part numbers, and connector repair info
S.E.I.T.S.Mastr II Information      (offsite link)
WX7Y's Mastr II Duplex Modification      (offsite link)
W4XE's Mastr-Pro and Mastr II Information      (offsite link)
NW6H and WB6ZSU's Mastr II to TNC Connection Chart      (offsite link)

Mastr II Miscelaneous:

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
GE Mastr II PLL Highband Exciter Manual - LBI-30398      Courtesy David Hopper WD4JKH
Duplex Isolation Curves for highband TX with PM vs. PLL exciter (from GE)      provided by Jeff DePolo, WN3A & Dave Karr KA9FUR
The Mastr-II Aux Receiver (LBI-30766L)      Includes the 19D417546G7 and G8 and antenna matching unit 19C321150G1 and G2   1.13mbpdf file, 28 pages
Converting a Mastr-Exec II and a Mastr-II to 900mhz      By Gene Colson W7UVH - a 10.5mb PDF of a 7 page article from CQ VHF June 1999
Another scan of the 900 MHz Mastr-Exec II and Mastr-II article

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)
Excelspreadsheet to assist in crystal calculations for the 220 Mhz. MVP conversion
CompleteConversion of Mastr II multiplier exciter and receiver to 222 MHz      By W4UWH      (offsite link)
How to modify a VHF UHS factory preamp for use in the 220 band        By Scott Zimmerman   N3XCC     
Mastr II 220 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 III Station Information:
Product Code file #SX - cracking the combination number on the standard Mastr III station      215 KB PDF
This is a "Rosetta Stone" document that will help you figure out what you have when you have a Combination Number that starts with "SXH" or "SXU". The first page is the translator for the combination number. The second page will help you determine which LBIs are the "top level" ones for your radio, and from them you can find all the lower level LBIs. From those you can build up a complete manual identical to what was shipped with the station.
The Mastr III Station programming cable is a straight-through DB9 serial cable.
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      Submitted by Matt Krick K3MK
Mastr-III Station Parts and Accessories Quick Reference Guide      A 1.7MB PDF file submitted by Matt Krick K3MK

Mastr Executive II Information:
The"Mastr Index" of Exec II Information
Product Code file #05 - cracking the combination number on the standard Mastr-Executive II station      102 KB PDF
This is a "Rosetta Stone" document that will help you figure out what you have when you have a Combination Number starting with "F" or "W" folowed by "I". The first page is the translator for the combination number. The second page will help you determine which LBIs are the "top level" ones for your radio, and from them you can find all the lower level LBIs. From those you can build up a complete manual identical to what was shipped with the station.
Exec II mobiles are covered by Product Code file 06       (Combination Numbers starting with "R" or "S" folowed by "X" or "T" followed by "4" or"5").
High power Exec II mobiles are covered by Product Code file 13       (Combination Numbers starting with "R" or "S" folowed by "X" or "T" followed by "6" or"7").
RCC and IMTS mobiles are coverd by Product Code file 18       (Combination Numbers starting with "C", "Y" or "X" folowed by "C" or "S").
Mastr Professional Information:

Product Code file #31 - cracking the combination number on the Mastr Pro mobile housing      250 KB PDF
This is a "Rosetta Stone" document that will help you figure out what you have when you have a Combination Number that starts with "M" or "S", followed by "T", "A", "E", "U" or "J". The first page is the translator for the combination number. The second page will help you determine which LBIs are the "top level" ones for your station, and from them you can find all the lower level LBIs. From those you can build up a complete manual identical to what was shipped with the station.
Product Code file #32 - cracking the combination number on the Mastr Pro Station cabinet      352 KB PDF
This is a "Rosetta Stone" document that will help you figure out what you have when you have a Combination Number that starts with "D", "P" or "V" followed by "M". The first page is the translator for the combination number. The second page will help you determine which LBIs are the "top level" ones for your station, and from them you can find all the lower level LBIs. From those you can build up a complete manual identical to what was shipped with the station.
KA1OKQ'sMastr Pro ER-41-C Receiver to 220 MHz Modification
WB4TUR'sMastr Pro Page

Delta Information:
CAUTION:     DON'T LET THE SMOKE OUT !
The radios that preceeded the Delta and Rangr in the GE product line mostly used push-pull audio PA decks and audio output transformers, and drove the speakers as a hot wire to ground.   The Delta, and many later radios eliminated the audio transformer and they run the the speaker as the push-pull load directly ... both sides floating off of ground.   This quirk is significant on your workbench: any audio test equipment that connects to the speaker (such as you would use to make a quieting measurement) must be on the far side of a 3.2 ohm or 8 ohm 1:1 audio transformer.   You can get one from most any web-based car stereo seller or at a local high-end car stereo shop (many dash-mount radios expect floating speakers, and many trunk mount audio amplifiers have grounded inputs).   In a pinch you can put a 2 watt resistor of any value from 8 to 22 ohms on the radio as a load, and use a 600 ohm to 600 ohm line transformer between the radio and the test equipment.   Note that the audio bandpass characteristics of that isolation transformer will have to be wider than the audio frequencies you hope to pass through the radio.

In short, if you ground one of the Delta or Rangr speaker leads you will let some of the magic smoke out of your radio.   So use an audio isolation transformer to prevent this - just put the transformer between the radio and any load that isn't an ungrounded stand-alone speaker.

Another caution: The name "Delta" covers three different product lines, and all are different internally. The early "Delta" is a crystal controlled design. Then the geniuses at GE came up with a synthesized design, and it was marketed as "Delta-S" - but it only covers about 2 or 3 MHz from highest to lowest frequency. Then they got a chance at a redesign and came up with the "Delta-SX" which can cover about 37-38 MHz - but it was made only for VHF and UHF - it was never made in a low band version. If you want a broad bandwidth at low band you need to find a Motorola "Syntor X" or "Syntor X9000" that can cover from 28 to 54 in one range.

Anybody want to contribute a few Delta, Delta S, or Delta SX photos? (exterior and interior)
GE Delta Information by Dave Kaar KA9FUR      Converting and programming the Delta series radio      (offsitelink)
More GE Delta Information      from a group of New England hams      (offsitelink)
    When using the TQ2310 Suitcase Programmer (LBI-31229) to program Delta radios refer to LBI-31263
Rangr Information:
Anybody want to contribute a few photos? (exterior and interior)
Anyone what to do an overview article?
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
MLS and MLS II Information:
Anybody want to contribute a few photos? (exterior and interior)
If anyone wants to do an overview article on the MLS or the MLS II (or both) radios we'd be happy to put it here. Just let us know.
The MLS was a synthesized mobile that used a PROM chip to hold the frequency information.
Programming the PROM chip takes specialized equipment that is not too common.
The MLS II is programmed by PC software and a connection cable.
Anybody want to do a programming article?
Repeater-Builder does not have any programming software. It can probably be found "out there" on the web; better yet, ask on the GE mailing list.
MPD Information:
The MPD came out around 1984 and was dropped around 1989.
Anybody want to contribute a few photos? (exterior and interior) and some information on the series?
MPA Information:
The MPA came out around 1988 or 1989 and was dropped in 1996. It was the successor to the MPD. It is a programmable radio.
Anybody want to contribute a few photos? (exterior and interior) and some information on the series?
MR-K Information:
Anybody want to contribute a few photos? (exterior and interior) and some information on the MR-K series?
MVS Information:       Front panel photo   257 KB JPG
Anybody want to contribute a few more photos? (exterior and interior)
Most of the MVS radios "out there" have 16 channels. Some have only 2, and a very few have 128.
The MVS uses the TQ-3310/TQ-3370 programming interface (RIB) and the TQ3315 (p/n 19B801417P4) programming cable, and programs through the microphone jack.
There is very little MVS information in amateur radio circles - anybody want to write a programming article?
Repeater-Builder does not have any programming software. It can probably be found "out there" on the web; or better yet, ask on the GE mailing list.
The MVS implements the tone squelch mic clip hangup feature by using a microphone that has a reed switch mounted inside the back of the microphone case, and a permanent magnet mounted in the GE-supplied mic clip that is mounted on the dashboard. When the user lifted the microphone out of the clip the reed switch changes the receiver mode from CG mode to carrier squelch mode. The microphone clips with the built-in magnets are almost impossible to find in the second-hand marketplace. Fortunately you can disable the hangup feature in the programmign software.
The LBI sections you will need to build the manual for your MVS will depend on if you are a user or a tech and if it is VHF or UHF. The list below is in LBI number sequence. Users will need only #7. Bench techs will need numbers 4, 5, 12 and 15 plus 1, 2, 3, and 6 for VHF, and 8, 8, 9, 10 and 11 for UHF. Remote mount (i.e. trunk mount radios will need #13. Desktop bases will need #14.
  1. LBI31919E   1.5 MB   High band 40 watt MVS maintenance manual
  2. LBI31920D   625 KB   High band RF board 19D901835G1 (136-153 MHz), G2 (150-174 MHz)
  3. LBI31921C   126 KB   High band Power Amplifier board 19C851540G1 (136-153 MHz), 9C851540G2 (150-174 MHz)
  4. LBI31922D   630 KB   Audio board 19D901870G1
  5. LBI31924F   1.15 MB   MDR, MTD, MVS, TMX-8825 System Board 19D901891G1
  6. LBI31926C   193 KB   Service section for high band combinations
  7. LBI31927D   MVS - Operators manual   Covers 2 channel, 8 or 16 channel, scan, selective calling (SelCal) and PA operation
  8. LBI31932F   421 KB   UHF 25 watt MVS maintenance manual
  9. LBI31934C   1.1 MB   UHF power amplifier board 19C851617G1 (403-440 MHz), G2 (440-470 MHz) or G3 (470-512 MHZ)
  10. LBI38258D   637 KB   MVS UHF RF Board
  11. LBI38292   205 KB   Service Section for UHF MVS combinations
  12. LBI38387B   374 KB   MVS Front cap assembly 19D901913G1 (this is the front panel)
  13. LBI38465B   388 KB   Remote mount option 19A705306G3
  14. LBI38635D   1.6 MB   MVS, TMX or MTD Desktop Station
  15. LBI38899   285 KB   MVS / MCS / TMX-8712 / TMX-8310 Logic boards 19D901690G11
VE3FYN has some information here. The manual he offers for download is the LBI31919E manual above.
KD4BBM has some notes on the MVS as well.
Ralph Hogan W4XE has some good MVS notes, some photos, interfacing information and pointers.
A few of notes on programming the MVS:
Each channel will have entries for TX, RX, CG TX, GUARD RX, STE TX / RX and CCT.
This translates to transmit RF frequency, receive RF frequency, transmit tone frequency, receive tone frequency, STE (y/n), and a numeric value for CCT.

STE means Squelch Tail Eliminator. Turning it on causes the transmitter tone encoder to invert the phase of the tone when you release the PTT, and keeps the transmitter on the air for about 100-200 mS. This mutes the receiver audio on the other end BEFORE your transmitter goes off the air, resulting in no squelch tail (some folks call it the squelch crash). Motorola calls this same system "reverse burst". It's EXTREMELY rare that you would want to turn that feature off.

CCT is the Carrier Control Timer, GEs name for the timeout timer. It turns the MVS transmitter off after a certain period, which is normally set between 60 and 90 seconds. This prevents locked-up repeaters and cooked mobile transmitters when the user sits on the microphone.

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
WB6RFW's GE MVP Radio Modifications
A VHF MVP/Exec II 222 MHz Conversion      From Southern California's Condor Connection
KC7GSA's Tune Up Instructions for the VHF MVP and EXEC II     Receiver    and   Transmitter
The Manual on the Parkinson controller that fits inside the GE MVP
      The system manual is LBI 3772, the board manual is LBI32792 and both can be found in the LBI master index.
Custom MVP Mobile Repeater Conversions from Scott Zimmerman N3XCC      GE conversions from Repeater Builder the company.
Temperature Compensation Capacitor information for 5C ICOMS      13kb PDF   provided by Chuck WB2EDV
Monogram Information:
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.
If anyone has any other Monogram information and the software we'll be happy to host it (assuming it's legal to do so).
Phoenix and Phoenix SX:
Anyone what to do an overview article?
Phoenix 2 channel to 16 channel modification      By Joel Huntley WA1ZYX      (offsite link)
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
Frequency Agile Modifications for Commercial Radios
Modifying the S990 head for direct frequency entry      By David Hopper WD4JKH        (offsite link)
       The 9xx heads will work with all Delta S, Delta SX and Ranger series radios.
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 1.6 gigabytes of free downloadable PDF'd GE Tech Manuals (the index alone is over 70 pages)
GE Technical Information      By Duane Hall of Hall Electronics
The GE email list server      For people seeking information on General Electric or Ericsson equipment
The GE Mastr II email list server      For people seeking information on GE Mastr II's
GE Manuals from Ted Jansen      A good source for original GE manuals
GE Duplex Operation Curves      Donated by Dave Kaar KA9FUR      Curves that show how much isolation is needed for different GE Station configurations
GE Part Number to Generic Part Number List      Donated by Jim Cannon K7KL      A list that allows cross reference from original GE part numbers to generic part numbers
Trivia & Miscellaneous Information:
GE Mastr Trivia Question      By Mark A. Cobbeldick KB4CVN

The Repeater Builder's web site does not evaluate the accuracy of materials created by persons beyond its control or supervision.   Therefore, although this site links to many additional web sites, The Repeater Builder's site is not responsible for the availability of or the accuracy of any materials contained within those web sites.

Mastr II® is a registered trademark of General Electric / Ericsson / Com-Net Critical Communications / M/A&-Com / Tyco / Harris (whatever their name is this month)
GE / Ericsson 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.