[Elecraft] T/R switching problem

[Dick Dievendorff]

Jan: 

I've had this problem several times over the years. Intermittent quiet
during Rx, tap the key to send a squirt of RF and the band livens up. For a
while.

When I first encountered this, my first suspicion was a 40 meter only
problem with my ICOM transceiver. My tower climbing buddy just moved
slightly and retightened all the cable clamps on the linear loading wires of
my 40 meter beam and the problem went away. (I've since replaced that
antenna).

One time it was a loose coaxial cable connector.

It's hard to find these. They might require certain temperature or humidity
or wind or ... to re-create.

I have a number of connectors between the radio and the antennas. Sometimes
I can isolate the behavior to one band or another, and that helps me locate
where in my switching arrangement the problem might lie.

The K3 (and KPA500, and KXPA100) use solid state devices for T/R switching,
and tend to have "working fine" or "not working at all" behavior.

73 de Dick, K6KR

-----Original Message-----
From: elecraft-bounces at mailman.qth.net
[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Jan
Sent: Wednesday, March 26, 2014 7:57 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] T/R switching problem

The T/R problem has occurred with different antennas.  However, there are
several interconnecting coax cables in the line, and these do not change.
All are soldered, but they are quite old, and home-constructed.  I suspect
that if it is a cable problem, it is in the shack.  I will pursue this line
of investigation and report back.

Thanks to those who have helped me to take a step forward on this problem.

73,

Jan, KX2A


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