Standard Disclaimer

Here's a small program, (written in C) to generate the EPROM contents for an RT85. This program is ONLY for the "Low band" RT85, NOT the RT85A or B or C. It may be vaguely relevant to these other models: I don't know, as I have only the one radio to play with.

This program is "a work currently in progress". I have got both the receiver and transmitter VCOs "on frequency" and the receiver scans through up to 32 channels. There are probably a few things the program should do (but doesn't). It seems to work.

On my radio, I unsoldered the EPROM, installed a "machined pin" socket, unsoldered the "strip" connectors and resoldered them so they were raised from the board a couple of mm. I can now program the 2716 in a standard programmer.

Here's my code:

• The source code for you to play with.
• How the channel code seems to be formatted.
• The list of channels and frequencies (read by program)

The last entry must finish with a "return" (just press "Enter" or "Return")

Each entry contains the channel number, receive frequency in KHz and transmit frequency in KHz.

• The list of channels to scan (read by program) in the order you want them scanned (maximum of 32)

The last entry must finish with a "return" (just press "Enter" or "Return")

Modifying the radio's hardware

• An excellent set of notes by Roger Baker VK3BKR and Mark Detering VK3TLW