COS Voltage

KB5AKO · Post by **KB5AKO** » Thu Mar 23, 2006 6:50 pm

I have a GM-300 in VHF that is an 8 channel version with the masked logic board. The COS voltage is 0.03 volts with a signal; and 0.7 volts with no signal. I understand that the COS is active low. However, it seems to me that the no signal level would be higher than 0.7 volts. Does this sound like the correct voltage?

Victor, KB5AKO

Will · Post by **Will** » Thu Mar 23, 2006 11:28 pm

Victor,

You need a 'pull-up resistor' to get a voltage swing from the open collector transistor that is in the GM radio.

KB5AKO · Post by **KB5AKO** » Sat Mar 25, 2006 7:37 am

Will,

Thanks a lot. That worked for me. Anyway, once again; thanks a million batwings!

Victor, KB5AKO

Will wrote:Victor,

You need a 'pull-up resistor' to get a voltage swing from the open collector transistor that is in the GM radio.

Will · Post by **Will** » Sat Mar 25, 2006 2:00 pm

Victor,

You are very welcome, Sir....