Sorry to be thick.... Is a dry joint same as a cold joint?
Thanks and 73,
matt W6NIA
On 5/4/2017 9:12 AM, Alan. G4GNX wrote:
FWIW we thought that a relay was failing on our club's KAT500. I
bought a new one from Elecraft and replaced it without thinking about
it. They're quite cheap and it wasn't worth chancing an intermittent
relay.
Whilst I was re-assembling the tuner, I discovered that the tag washer
connecting Ant 1 to its screw terminal had developed a dry joint,
which was the real cause of the intermittency. I don't know whether it
was a manufacturing fault or someone had been heavy handed when
assembling it.
It would be worth checking soldered joints and other connections
before replacing a relay. You may need to use a magnifying glass as it
may not show up on a meter test. Another thing to try is what we used
to do as service technicians; use an aerosol freezer spray in small
areas around the suspected area and possibly a hair dryer on a warm
setting (not hot) and observe for changes under test.
73,
Alan. G4GNX
-----Original Message----- From: Victor Rosenthal 4X6GP
Sent: Thursday, May 4, 2017 3:07 PM
To: elecraft@mailman.qth.net
Subject: Re: [Elecraft] K3 with subrx - intermittent main RX problem
and pwr out
Well, I had a relay fail on my KAT3 board. I don't remember which one.
Elecraft sent me a replacement. It wasn't hard to replace, but it
happens.
73,
Victor, 4X6GP
Rehovot, Israel
Formerly K2VCO
http://www.qsl.net/k2vco/
On 4 May 2017 16:46, Don Wilhelm wrote:
Olaf,
The relays used by Elecraft are quite reliable, so I suspect that is not
a reasonable source of the problem. In more than 12 years of repairing
the Elecraft legacy gear (more than 1200 repairs), I have had to replace
only a small handful of relays due to failure. I have replaced several
where the builder has distorted the case with a soldering iron.
I would double and triple check the SUBIN and SUBOUT connectors. A
connector failure is much more likely than a relay failure.
You might contact K3support to see if they have encountered a situation
like yours before.
73,
Don W3FPR
On 5/4/2017 3:31 AM, la3rk wrote:
I have a K3 approx 8 years old. Fully equipped with subrx, 100W PA,
antenna
tuner and in/out module.
When I connect the subrx, the main rx sometimes loses signal and at
the same
time power out goes to zero.
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"A delay is better than a disaster."
-- unknown
Matt Zilmer, W6NIA
[Shiraz]
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