I'm building an EchoLink interface and one of the signals to the tranceiver
is COR.
What does COR stand for please?
I have no reference to COR in my Kenwood TS2000 manual. I suspect it may
have something to do with squelch.
Thanks.
Howard.

Howard James wrote:
I'm building an EchoLink interface and one of the signals to the
tranceiver is COR.
What does COR stand for please?
I have no reference to COR in my Kenwood TS2000 manual. I suspect it
may have something to do with squelch.
Thanks.
Howard.


COR = Carrier Operated Relay
A signal used in a repeater to indicate that a carrier is being received.
Used to be a common signal in old tube-type equipment, where the receiver
and transmitters were controlled by relays. Modern solid-state equipment
doesn't have a COR signal... it's usually a logic-level signal from the
squelch circuit that indicates that the receiver has detected a carrier.

--
David
dgminala at mediacombb dot net

In article ,
Howard James wrote:

I'm building an EchoLink interface and one of the signals to the tranceiver
is COR.

What does COR stand for please?

I have no reference to COR in my Kenwood TS2000 manual. I suspect it may
have something to do with squelch.

COR is (I believe) an acronym for "Carrier Operated Relay", and is
often referred to these days as "COS" ("Carrier Operated Squelch").

It's a signal which comes from a receiver of some sort, which means
"I'm detecting a sufficiently strong carrier to 'believe' that there
is an incoming signal of some sort."

Just what this signal actually indicates, depends on the radio. It
might be from RF detection in the front end, or be based on the
S-meter circuitry in an FM limiter/discriminator, or might be based on
a reduction in the noise level in the signal coming out of the FM
discriminator (the latter is most common in VHF FM radios).

In the case of a COR signal coming out of an Echolink or similar
interface, it would be controlled by software, and I'd imagine that it
probably means "We're receiving incoming audio packets via the
Ethernet." You'd feed it (possibly with inversion and/or buffering)
to the PTT input to your transceiver.

If it's intended as an *input* to the Echolink interface, then it
would probably be connected to a "signal arriving, speaker on!" output
from your transceiver... but most transceivers don't have one of these.

--
Dave Platt AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!

On 5-23-2011 21:08, Dave M wrote:



COR = Carrier Operated Relay
A signal used in a repeater to indicate that a carrier is being received.
Used to be a common signal in old tube-type equipment, where the receiver
and transmitters were controlled by relays. Modern solid-state equipment
doesn't have a COR signal... it's usually a logic-level signal from the
squelch circuit that indicates that the receiver has detected a carrier.


Correct. Looking at a TS-2000 manual on line (I do not own a TS-2000),
I would say the signal you want is on the ACC2 port on the rear of the
radio and called MSQ. This pin goes to ground when the squelch is
opened and/or receiving a signal. It is an "open" when the audio is
squelched. If your Echolink interface is looking for a "ground" signal
to indicate the presence of RX audio, this pin should work as is. If
your interface needs a positive voltage during RX, then you would need
an NPN transistor used as an inverter.


N0EDV

Hi Howard

I strongly sujest to you to start reading the repeater builder mailling list
and to go on there web page..

even if you dont whant to build a repeater you will learn a lot about signal
type and there uses..



"Howard James" wrote in message
...

I'm building an EchoLink interface and one of the signals to the tranceiver
is COR.
What does COR stand for please?
I have no reference to COR in my Kenwood TS2000 manual. I suspect it may
have something to do with squelch.
Thanks.
Howard.

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