[Elecraft] K2: Flaky 160M switching

[Don Wilhelm]

Jim,

K1 and the entire 160 meter low pass filter is not in the path for the 
RX ANT, so changing K1 will not help.

Remove the top cover (you can operate like that) and tap on things 
gently with a pencil eraser to see if you can locate the problem.

73,
Don W3FPR

On 3/2/2019 4:17 PM, Jim KO5V wrote:
> Don,
>
> Switching to the RX antenna has no effect. The only thing that seems to work is a tap on the back
> of the left side panel, at about the 2d connector. That causes the 2Mhz birdie to return. I've
> touched up all of the solder joints on the 160M board, and on J14. Maybe K1 is bad, but I'll look
> again for a bad solder joint before going there.
>
> Thanks again. 73,
>
> Jim KO5V
>
>
> -----Original Message-----
>> From: Don Wilhelm <donwilh at embarqmail.com>
>> Sent: Mar 2, 2019 1:58 PM
>> To: Jim KO5V <ko5v at earthlink.net>, Elecraft List <elecraft at mailman.qth.net>
>> Subject: Re: [Elecraft] K2: Flaky 160M switching
>>
>> Jim,
>>
>> Replacing K8 is not going to do anything for 160 meters.  The relay that
>> switches in the 160 meter low pass filter is K1 on the K160RX board.
>>
>> Try this the next time it happens - while on 160 meters, change the
>> antenna to the RX ANT jack and set the RX ANT menu parameter to ON.  See
>> if you obtain receive.  The RX ANT bypasses the Low Pass Filter.
>>
>> You may have a poor solder connection on the K160RX board or its header.
>>
>> 73,
>> Don W3FPR