The external reed relay /miniature relays are OK IF they are keyed by the
key line AND the RF is delayed a few ms from key line down.(K3 does this)
The diode limiter circuits like the AS and others like that don’t have this
limitation.
BUT I would be interested in the OFFICIAL Elecraft position on their COR
What bothers me about it is that if the internal relay is clicking , it has
to already have seen enough RF to be considered potentially damaging in
order for the K3 to decide the relay needs to be actuated . So the barn
door is closed after the RF has been applied for an unknown period but
surely a couple milliseconds.
I am a belt and suspenders type guy especially with expensive equipment -
and my feeling is that the K3 COR is telling me to DO SOMETHING ABOUT IT
NOW. I would never continue to operate with it actuating. I treat it as a
nice warning thing Mr. Elecraft has given me, not something to be used
continuously.
I made my own RX ant protector with a little DPDT miniature relay that has
gold plated contacts . It is wired so the rx ant line is opened and also the
K3 rx input is shorted. One could argue which should come first I guess but
I get over 100 dB isolation on 160 measured with VNA.
Hank K7HP
I'm looking for a device to protect my K3S front end when using a RX
antenna. As I key my rig I can hear the COR clicking and it's making me
nervous.
I have seen the AS-RXFEP review by W1ZR in QST. I have also seen devices
with reed relays on the web. What are you using or am I just foolish to
worry about this?
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