Back to Index   GE MVS Supplemental Information
Maintained by Kevin Custer W3KKC

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. Some have had luck making a hangup clip with a magnet. Others have added a slide switch to the microphone case. Fortunately you can disable the hangup feature in the programming software.
The LBI sections you will need to build the manual for your MVS will depend on if you are a user or a maintainer 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 added to the list. Desktop bases will need #14 added.
  1. LBI-31919E   1.5 MB   High band 40 watt MVS maintenance manual
  2. LBI-31920D   625 kB   High band RF board 19D901835G1 (136-153 MHz), G2 (150-174 MHz)
  3. LBI-31921C   126 kB   High band Power Amplifier board 19C851540G1 (136-153 MHz), 9C851540G2 (150-174 MHz)
  4. LBI-31922D   630 kB   Audio board 19D901870G1
  5. LBI-31924F   1.15 MB   MDR, MTD, MVS, TMX-8825 System Board 19D901891G1
  6. LBI-31926C   193 kB   Service section for high band combinations
  7. LBI-31927D   MVS - Operators manual   Covers 2 channel, 8 or 16 channel, scan, selective calling (SelCal) and PA operation
  8. LBI-31932F   421 kB   UHF 25 watt MVS maintenance manual
  9. LBI-31934C   1.1 MB   UHF power amplifier board 19C851617G1 (403-440 MHz), G2 (440-470 MHz) or G3 (470-512 MHz)
  10. LBI-38258D   637 kB   MVS UHF RF Board
  11. LBI-38292   205 kB   Service Section for UHF MVS combinations
  12. LBI-38387B   374 kB   MVS Front cap assembly 19D901913G1 (this is the front panel)
  13. LBI-38465B   388 kB   Remote mount option 19A705306G3
  14. LBI-38635D   1.6 MB   MVS, TMX or MTD Desktop Station
  15. LBI-38899   285 kB   MVS / MCS / TMX-8712 / TMX-8310 Logic boards 19D901690G11
There is another front cap LBI that we do not have- LBI-31925. If anyone has it we'd appreciate a scan, or an opportunity to scan it.

A few notes on programming the MVS:
If your turn on a new-to-you radio and get an E0 error that means that the receive synthesizer is unlocked. An E1 error indicates the radio is not programmed. Both can be caused by a missing (or blank) EEPROM; it may have to do with which fault the CPU catches first. Many used radios have been found with missing EEPROM chips. The right way to deprogram a radio so the new owner can't just plug and play is to over-write the department frequencies with new channels programmed as receive only (likely candidates are the 7 weather channels for VHF, or the FRS channels (receive only) for UHF).

An E3 error indicates no communication with the front control panel.

All of the error codes are defined in LBI-31926.

The programming software is a DOS application and you will need real DOS (or the DOS side of Win 95/98/ME), a real serial port and a TQ-3370 or P-96-A MVS programming cable. I believe that the cable can be made from an old IDE hard drive cable. The software comes in versions versions 1.1, 2.2 and 3.0. Once you program a radio with a higher version you can't go back to the older version.

Each channel will have entries for TX, RX, CG TX, CG RX, STE TX 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 STE TX off.

CCT is the Carrier Control Timer which is GEs name for the transmitter 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 (not if, when) the user sits on the microphone.
A few notes on the MVS firmware, from a comment thread on the the GE mailing list:
If you end up with a MVS that was "deprogrammed" by pulling the wrong chip (the firmware chip instead of the EEPROM chip) you will need to get a new firmware chip. The older logic boards use the 87C64-20 chips and the newer logic boards use the 87C257 chip. The firmware images are "out there". The funny thing is that if the EEPROM is still there, once the firmware PROM is put back in one of these "depreogrammed" radios it will come back working on the original frequencies programmed and on the last channel and volume setting selected.

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