[Elecraft] KSYN3A mod problem

[Nick Lelyak]

Thanks Don, Guy
appreciate yours quick response.
I found out that problem disappears when front panel warms up to 37 C
and more.
Looks like problem somewhere in FP. To clean main connector I used
Electronic Contact Cleaner. It may works not so good as Deoxit which
is not widely available in Canada. In any case to move on have to buy
Deoxit first.
Thanks again

73, Nick VE3FJ


On Mon, Sep 7, 2015 at 4:00 PM, Don Wilhelm <w3fpr at embarqmail.com> wrote:

> Nick,
>
> I don't think it is related to the synthesizer, but go through the other
> things you did (cleaning the Front Panel connector and some other boards) -
> you should unplug those, and depending on how you "cleaned" the connectors,
> wipe them carefully and reassemble.
> Work on each connector one at a time and test again after each one.
>
> 73,
> Don W3FPR
>
>
> On 9/7/2015 2:41 PM, Nick Lelyak wrote:
>
>> Hi,
>> have replaced old synthesizer in my K3 for new KSYN3A and have problem
>> with
>> this modification.
>> Changing frequency by VFO A or VFO B several kHz up or down switches mode
>> to reverse
>> (CW to CWR, USB to LSB), frequency on display jumps 1 mHz lower ( ex.
>> 14015.00 > 13015.00,
>> 1830.00 > 0830.00 etc.) and band pass filters relay click can be heard at
>> the same moment.
>> After switching 1 mHz lower rotating VFO A frequency changes as it should,
>> nothing clicking, mode is not reversing but radio is far away from amateur
>> band.
>> After keeping radio an hour or so on and warming it up problem disappears.
>> K3 has no sub receiver installed. Firmware 5.33
>> Front panel connector and some other on boards around synthesizer were
>> cleaned.
>> When I put original synthesizer back problem didn't disappear and was
>> exactly same as with new unit.
>> I would appreciate any ideas to locate and fix this problem.
>> Thank you in advance
>>
>>
>>
>