[Elecraft] K3 Receiver

[Dave Hachadorian]

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 at 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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