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COS Voltage
Posted: Thu Mar 23, 2006 6:50 pm
by KB5AKO
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
Posted: Thu Mar 23, 2006 11:28 pm
by Will
Victor,
You need a 'pull-up resistor' to get a voltage swing from the open collector transistor that is in the GM radio.
Posted: Sat Mar 25, 2006 7:37 am
by KB5AKO
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.
Posted: Sat Mar 25, 2006 2:00 pm
by Will
Victor,
You are very welcome, Sir....