Perhaps your problem is external to the K3. Are there any
normally-open relays between the K3 and the antenna?
I had this same issue happen to me several times in a December
contest. I suspected the problem may have been a dry circuit
issue in the AL-1500 T/R relay. Since then, there have been two
low-power contests in January and, for those, I bypassed the
AL-1500 (rerouted the coax). The problem did not recur in either
one of those contests, despite thousand of T/R cycles on the K3.
It looks like my suspicion regarding the AL-1500 was correct. I
will "dry-clean" that relay before the next high power contest.
Here is a good article on cleaning relays:
http://www.w8ji.com/relay_cleaning_and_life.htm
Dave Hachadorian, K6LL
Yuma, Arizona
-----Original Message-----
From: Larry Boekeloo
Sent: Thursday, January 24, 2013 9:44 AM
To: elecraft@mailman.qth.net
Subject: [Elecraft] K3 Receiver
Good morning everyone from snowy, frigid Michigan...
I have K3 SN# 52XX and the receive seems to come and go on 30
mts - that's where I notice it the most but it happens on other
bands too.
My AGC settings are:
AGC DLY - NORM
AGC HLD - 0
AGC PLS - NORM
AGC SLP - 4
AGC THR - 12
AGC F - 120
AGC S - 20
For example, the S-meter will be reading an S3 noise level and I
can see it on the P3. Suddenly, the noise levels drops to zero
and the P3 follows. If I'm listening to a CW signal, that signal
drops too. If I hit the keyer and send a dit, the receive comes
back. I've noticed this on a few of the other bands too.
I am running the latest firmware and software but I've noticed it
on the previous versions too.
Ideas???
Thanks.
Larry, KN8N
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