[Elecraft] K2 Low Receive Sensitivity on High Power

[Don Wilhelm]

Jonathan,

It is not a "well-known problem", but I believe you are correct to 
assume the problem source is in the T/R switch.  I would suggest that 
you check diodes D11, D12 and D14 first - or just replace them, 1N4007s 
are plentiful and inexpensive.

73,
Don W3FPR

Jonathan Taylor, K1RFD wrote:
> K2/100 # 2462, with all options except DSP.
>
> I've noticed just recently that when turning the Power above 10 W (and 
> hearing the relays click), the receiver gain drops 20 or 30 dB.  The 
> receiver returns to normal sensitivity when the Power knob is returned 
> to a lower setting.
>
> This must have starting happening only recently.  The rig is working 
> fine on transmit at all power levels.
>
> Looking at the schematic, I suspect the the first place to look will be 
> the T-R switch in the KPA100, but I thought I would post to the list to 
> see if this is a well-known problem.
>   
>