M1225
Out of band programming
Using RSS versions 1 and 2, Out of Band programming can be done by holding down the shift key for everything except the decimal place during frequency entry.
Using RSS version 3.1 we have had some people say that this method doesn work, while others say it works fine. Your mileage may vary.
Program the radio with this cable.
The accessory connector pinout is the same as that of the SM50/120 radios.
Channel Expansion
There is a selection in the RSS to make the radio 24 channels. If you select this option, as long as you don't use the alphanumeric portion on every channel (or it will run out of memory) you can get 24 channels in.
However, we have been told that one of the greatest memory hogs is the Talk-Around button option. If you delete this option, you should be able to alpha-tag all the channels.
General Information
Some very early M1225's would not let you put audio into pin 5. It was frozen off by the firmware. Motorola did swap radios so you could use pin 5 BUT.... the input is switched by the PTT line from the accessory connector. You cannot use both mic and acc. audio in.
An RSS note, the RSS for these radios is not backwards compatible. That is to say, once you program a radio with a newer version of software, there is no going back. Likewise, if the radio you have has been programmed by newer software than you posess, you will not be able to read/write it unless you get the same or newer version than what is in the radio.
P1225
General Information
Using RSS versions 1 and 2, Out of Band programming can be done by holding down the shift key for everything except the decimal place during frequency entry. This will no longer work with the newest version of RSS (3.1).
So far there is only one method we know of to open up the bandsplit of these radios (RSS >v3.1), along with the number of channels.
Scholer-Johnson Inc. makes a PC Board which goes into either the P1225 or the M1225 which will make the radios capable of going up tp 256 channels.
By using that board (aprox. $100) you can stretch a VHF down to 136 and up to 175 Mhz.
The modification also includes zone scan. The only thing they haven't worked out yet how to seperate the pl or dpl or csq functions. Both receive & transmit have to be both pl/dpl/csq.
If you are interrested, Scholer-Johnson (SJI) can be contacted at (407) 645-5093.
