Wayne,
What about Snow static on the main antenna and danger to the rcv? It is
fairly high voltage and I assume not much current? I had a bunch during
the 10 meter contest. Those of us in the north country hear it snapping
in the antenna switch quite regularly if not grounded during the winter
time. I have never had trouble with previous radios but wondered since
I have read comments about induced power from a passing thunder storm so
in these cases you should unhook the K3.
Ed W0SD
wayne burdick wrote:
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
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