[Elecraft] K3 with subrx - intermittent main RX problem and pwr out

[Bill Johnson]

Matt, a difference in the language.  I would take them to be the same.

73,
Bill
K9YEQ

-----Original Message-----
From: Elecraft [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Matt Zilmer
Sent: Thursday, May 4, 2017 11:44 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] K3 with subrx - intermittent main RX problem and pwr out

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 at 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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