[Elecraft] K3 Freq jumpnig when cold (50F or so)

[Arie Kleingeld PA3A]

Bill,

Maybe it's a hardware problem:
The connector from frontpanel to main rf board for example?

When the temp is low, maybe there are some bad contacts. Take off the 
front panel and  clean all pins of the connections. Do this thouroughly, 
polish all four sides of each connector-pin.

73
Arie PA3A
K3 #1255

Op 21-10-2016 om 1:50 schreef Bill Coleman:
> Thanks Don.    I put on 5.54.... The K3 is behaving differently....   No
> more jumping down 1MHz.
>
> What it is doing now:  there's still a relay clicking once in a while as I
> tune VFO A - this is within any given ham band.
> Now, while tuning VFO A, VFO B will jump frequency.
>
> Example:
> VFO A = 3.853, press A>B, tune A up frequency less than a kHz, B jumps, now
> A = 3.853 B = 3.994
>
> Somewhat similar but stranger behavior on 40M
> VFO A = 7.274, press A>B, tune A up freq, B jumps a LOT, now A=7.275 B =
> 8.600
>
> In the time it has taken to test and scribble the results, the rig has
> warmed up from 50F to 66F and it works fine  No freq jumps, no relay
> clatter.
>
> OK, I went back to Firmware  5.52 & chilled the rig (53F).   The jumping
> 1MHz down is back.   Hmmm...  Next step?  I'm thing the FP flash memory has
> a problem with low temps.
>
> THX,  Bill  N2BC
>
> -----Original Message-----
> From: Don Wilhelm [mailto:donwilh at embarqmail.com]
> Sent: Thursday, October 20, 2016 10:51 AM
> To: Bill Coleman; Elecraft at mailman.qth.net
> Subject: Re: [Elecraft] K3 Freq jumpnig when cold (50F or so)
>
> Bill,
>
> Try loading beta firmware 5.54 to that K3 and see if that behavior
> continues.
> That firmware improves the flash memory interface.
> I can't say for sure if it will fix that K3, but is worth a try.
>
> 73,
> Don W3FPR
>
> On 10/20/2016 10:16 AM, Bill Coleman wrote:
>> Have our club's K3/100, serial # 67xx.   When it is cold (FP=11C  52F ),
>> increasing the frequency using  VFO A or VFO B causes a 1MHz jump DOWN
>> in frequency.  When reducing frequency the failure is much less
>> frequent and it will also jump down 1 MHz.  At times while tuning up
>> in freq there are some relay clicks - usually 2 -  but no frequency jumps.
>>
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