At 10:57 PM 12/27/08, you wrote: > > The MaxTrac/GM300 radios use one of several methods for changing > channels remotely: > > > > 1. one input line to revert to a known channel, > > 2. two input lines: one to go UP, one to go DOWN, > > 3. four input lines which you program with a binary code: 0000 > thru 1111 to select the desired channel. > > > > Of the various methods, the one where you tell the radio which > channel to go to is far more reliable. The others depend on you > knowing where the radio is before you tell it to change because > there is NO feedback of any kind. > > > > If you want something that's very user-friendly and may even > provide feedback in some way, you're better off with an Icom, > Kenwood, or Yaesu radio. The Motorola link radios you're using just > don't have what you want. > > > > Bob M. > >On the GM300 we are using we >programed it so we can change >channels remotely thru the accessory >jack using pins 6,8 and 9 if I >remember right. We pulled them low, >one at a time and the channel >changed accordingly. It worked fine. >We just need to hear some kind of a >confirmation over the repeater to >confirm the channel change. > >Rod
What kind of repeater controller are you using? Any decent controller will have a way to indicate a completed function. On our system we have macros that: a) turn the 2m remote base off b) select channel N where N is 1 through 8. Each channel has a preselected CTCSS tone. c) select CTCSS encode tone NN where NN is 01-32 (tone 00 is carrier squelch) (this overrides the preselected tone) d) enable the 2m transmitter for the current channel. Each of the above functions is several commands in the controller. Each is triggered by sending a DTMF string that triggers a macro. One of the commands in each macro sends a beep or speech message appropriate to the command (for example, selecting tone 00 says "none", tone 13 says "one hundred". Note that these responses all come from the controller, not from the remote base radio. There are several commands that turns the 2m transmitter off, including changing the channel, changing the encode tone, changing any of the point-to-point link configurations, or any of the patch functions. These are all controlled by macros. If you let us know what controller you are using we can give you some pointers. Mike WA6ILQ
