[Elecraft] K2 deaf on 20m, other bands OK

[Phil Wheeler]

Ed Long wrote:

>I am beginning to believe I have a bad relay or something. BTW, my 30M works just fine too. Full power out on the other bands including 30M and the receiver is fine except on 20M. I have noticed that when switching to 20M I hear a burst of band noise for a split second as the relays switch when the radio changes bands to 20M but then the noise stops within .25 seconds. That is what is making me think I might have a relay with a bad contact or some other internal defect. 
>

I think the burst of noise is normal -- due to a firmware change to 
reduce wear on the relays by delaying the bandswitch (e.g., if you go up 
or down by more than one band).  I noticed this at first when I upgraded 
from 1.X to 2.X firmware or at some such time.

>The interesting thing though is that by touching the antenna on the relay pins it works and it seems the relays are fine. This is frustrating to me because 20M is my favorite band and I have not been able to use the radio on 20M at all. I have also thought that perhaps the radio needs to be reset because the relay control might be confused somehow but I have not done that yet. Maybe that's the next step for me - then realignment of the radio.
>

You should be able to test the relays by swsitching to 20, leaving it 
there for a short time and then turning off the radio.  The relays 
should be latched in the 20 meter state and an ohmmeter can be used to 
see if they are OK.

I'm wondering if this is a toroid problem: Are all inductors used for 20 
m wound on the correct type of core?  If all solder connections for the 
toroids have been checked, this is worth a shot -- though a long one, I 
admit.

73, Phil