[Elecraft] 160M Dead on my K2

[Mark Adams]

Don,

The suggestions did not fix my issue.  All solder joints were redone 
and I checked everything with a magnifier light. Relay K2 works fine. I 
checked it on 80m where the RX is fine.  I checked the bottom of the 
main board and all is well there too.  

When I switch bands to and from 160, I can see a small blip on my old 
analog VM from pin 16 to GND. I see a similar blip when I turn off/on 
the RX antenna using pins 3 and GND.  

Any further thoughts?

73,
Mark K2QO


Quoting Don Wilhelm <w3fpr at earthlink.net>:

> Mark,
> 
> Well, if relay K1 does not switch, you will not have any output on
> 160
> meters - but you also said that it does not receive on the Rx
> antenna
> either - so relay K2 must not be working either.  That combination
> would
> point to something wrong in the relay coil circuits.  Check all the
> soldering on pins 3, 4, and 16 of J1 and check the soldering on the
> header
> as well (that will likely require removing the heat sink from the K2.
>  Also
> check pin 1 of the header and J1 (that is the signal path for the RX
> antenna).  Check the soldering on the K160RX board at the relay pins
> too.
> 
> You are probably looking for an unsoldered connection, or one that
> was not
> adequately heated.  These connections can often work initially but
> develop
> enough oxidation to give trouble after a year or so.