Maxtrac 99 Channel Modification

99 Channel Modification
Yes, there is a 99 channel Maxtrac. It was a SP model, low band unit that was made for Ontario Hydro in Eastern Canada. The model number is ACD51MJA9HA5AK and covers 42-50 MHz.
This radio was basically a stock low band radio, with a modified HLN9313A logic board. The logic board has a larger EEPROM installed to hold the very large codeplug as well as different (VLN5443A) firmware.
This modified radio is only able to be programmed with VVN4168A RSS. This is SP Maxtrac RSS that only supports this model.
If you are interested in the original manual supplement that covers this model, click to see page 1 and page 2.
You can convert a normal Maxtrac with the HLN9313A, 16 pin logic board, to a 99 channel model by following the instructions contained in the manual supplement. Once you expand the EEPROM and put the new firmware in, you will need to blank the logic board with Maxtrac Lab RSS and then re-initialize it with the 99 channel RSS service menu. Once you do that, you should have a radio that is capable of 99 channels, you will need to hack the .mdf file depending on what the bandsplit of the RF board is in your radio in order to be able to program the proper frequencies into it.
FYI, the firmware and RSS is NLA from Motorola. Good luck in locating it.

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