"k3hvg" wrote in message
. ..
Bob Spooner wrote:
"Richard Knoppow" wrote in message
...
Are we talking about RF here?

Yes. I was triggering the scope on the transmit RF and looking at the RF
on
the output of the receive port across 51 ohms. 73, Bob AD3K



That about +16dBm. Shouldn't do any real harm. Healthy signal but
non-destructive.

Electronic switches might not have the isolation you would prefer. With a
single band you have the luxury of hanging a stub on the RX port to short
the input during TX Otherwise, something should do that fast enough. Since
there is 100w pep and I assume you measure 4v pp that is 16/51= .314 w pep
so:

10 log 100/.314 = 25 dB isolation. Not real swift. I would want better
than 35 dB Isolation. Even more for QSK. I wouldn't want to wait for the
RX to recover. I have equipment that burns out the input protection above
..25 w input (ave.)

You might not have trouble with a tube RF amp but...