Motorola M1225 remote channel change?

[JPriami]

I picked up a M1225 the other day. I plan on using it for the link radio on UHF to a VHF repeater. I want to be able to tie into the local UHF repeaters if need be.
The only problem I am running into is I cant find out if there is a way to change though the 20 channels remotely as a user on the VHF repeater.
Is there a way to do this?
The only way I can think up is I would have to open up the radio and tap into the channel + & - button. Then use a DTMF command on the repeater controller to pulse up and down to the radio.

[AEC]

I doubt you will be able to command all 20 channels through the accy. port, and even if you use a tone remote, you might be able to access 4 to 8 at the most.
I have a pair of M1225s doing similar duty, but RX only.

You might look into DTMF control of at least 4 channels with a tone remote adaptor, like a 1548, but you will need to generate the usual 2150/1950 as well as whatever tones required to change channels.

[maxkelley_kc2spy]

If you're handy with microcontrollers, you could program one up to send SB9600 serial commands to the radio... Program one button as a home select, send the command for that button, followed by the "channel up" command for number of times it takes to get to the channel you want...