Jerry Flanders wrote:
At what approx. RF voltage level sent back into the rx from the second
antenna do we need to worry about additional protection like external
switching or shorting?
The short answer is: the voltage resulting from input power high enough
to trigger the COR (probably 0.5 to 2 W in most cases). This will vary
widely because the impedance of the sub's antenna on the *transmit*
band may be totally different from its Z on the sub's receive band. At
very high impedances, strays from the coax and the COR circuitry itself
come into play. If you use the KAT3's non-TX antenna as the sub's AUX
source, the small amount of leakage between ANT1 and ANT2 can also
affect the COR trigger level; this will depend on the load Z and will
vary from band to band.
Also, what do I hear when the COR activates? What sound? Is this a
reed relay?
You'll hear about the same thing you hear when you switch from CW to
SSB mode (this throws a relay on the KREF3 module), except it will
follow the keying. It's not a reed relay, but it is small, and rated
for very long mechanical life. Still, I recommend not pushing it. If
you hear it, you should improve the antenna isolation on that band.
I operate SO2R and occasionally need to measure to verify safe RF
level into the second rig and would also like use my 2nd K3
(synch-tuned) for diversity rx while tx'ing on 1st K3. An actual RF
voltage level I can use as a measurable limit would be a very useful
parameter.
What I mentioned above is the best I can give you. If you can keep it
to 10 Vpp or less, I think you'll be OK, but I'd still advise testing
things before you operate in a contest.
73,
Wayne
N6KR
---
http://www.elecraft.com
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