Where do I pull COS off of a GM300?

Jack · Post by **Jack** » Thu Dec 20, 2001 8:05 am

Guys,

I have a question. I am going to use a GM300 for a receive radio on a repeater my group is building. I am going to run it into a com-spec multi-tone board so the motorola RICK is out of the question for this application. Can you tell me which pin on the 16 pin connector is used for COS? I haven't yet put a multi-meter on them to see which one will give me voltage when a signal is received, so I thought I'd ask first and maybe save some time. I don't see anything in the RSS for the programmable pins that says COS, but maybe one of the other options would do the same thing? Any help would be appreciated.

Jack

Jack · Post by **Jack** » Thu Dec 20, 2001 8:17 am

One more thing. If there IS a COS pin on this thing, does anyone know what voltage it goes to on receive?

Jack · Post by **Jack** » Thu Dec 20, 2001 10:22 am

forget it. pin 8 works fine.

Will · Post by **Will** » Thu Dec 20, 2001 5:28 pm

I was going to say that pin 8 on the accessory jack is normally the COS function and goes "zero true" or zero volts with carrier operation, 5 volts thru a 4.7k ohm resistor with no receive activity.
This can be changed in the RSS.

raymond345 · Post by **raymond345** » Thu Dec 20, 2001 6:12 pm

There are two gm300 boards.
One is 8 ch. and 1 for 16 ch.
16 ch. has more RSS programming features.
What # of ch. do u have?
Raymond eMail [email protected]