[arm-allstar] COS equivalent for other radios

[Marshall]

Fred, 

COS stands for Carrier Operated Switch and used to be called COR. (Short for Carrier Operated
Relay) 

The function of the COS is to tell the repeater controller (in our case Allstar software), that
your Allstar nodes receiver squelch is open, and that there is a signal there.  

The COS signal is usually a voltage that swings high or low to give either a + voltage or
ground with the receiver active.

Every radio is different where the COS signal is, most radios that have a packet data port have
the COS signal on one of the pins.

Older radios you are going to have to open the radio up and dig around with a volt meter to
find the COS signal. 

Google the model of your radio along with the words "COS signal" you can sometimes find the
information you need. 

Marshall - ke6pcv 




-----Original Message-----
From: arm-allstar [mailto:arm-allstar-bounces at hamvoip.org] On Behalf Of "Fred Hillhouse via
arm-allstar"
Sent: Thursday, March 15, 2018 10:23 AM
To: arm-allstar at hamvoip.org
Cc: Fred Hillhouse
Subject: [arm-allstar] COS equivalent for other radios

Greetings,

 

I have an older radio I am looking at to be a home node. I was looking for something that might
describe the COS signal. Can someone guide as to what I am looking for? I am happy with
learning what I should Google for. COS brings up Motorola radio links by the hundreds.

 

Thanks!

 

Best regards,

Fred N7FMH



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