[Elecraft] K1 Problems

[Don Wilhelm]

Steve,

The quickest way to do the alignment is to use an RF Probe or an 
oscilloscope with a 10X probe.

First probe band board P1 pin 6 and peak for maximum RF on both bands. 
The can be done in receive.
Then connect a dummy load and do a TUNE at about 1.5 watts.
Connect a probe to band board P2 pin 8.  First on band 1, adjust L5 and 
L6 for a peak - then refine the adjustment of L1 and L2 to maximize that 
peak.
Do the same for Band 2 - adjust L7 and L8 for a peak, and then refine 
the adjustment of L3 and L4.

Do you have power output?  refine the adjustment of L7 and L8 on Band 2 
and adjusting for maximum power - an external QRP wattmeter is handy for 
that step.

Switch to Band 1 and refine the adjustment of L5 and L6 for maximum 
power output.

When you have done that, the band board has been aligned the best it can 
be.  If you still have a receive problem it is somewhere other than the 
band board.

I am not sure what you mean by "C2 Gain tweek" -- C2 is a fixed 
capacitor in the VFO.  If you meant C20, then that shifts the BFO, and 
it should be set to center the signal in your receive passband.
You can adjust C20 - while receiving your local signal, adjust the VFO 
to maximize the signal, without regard for the pitch (do this with the 
narrowest K1 filter set).  After doing that, adjust C20 so that you hear 
the signal at your preferred pitch.  Make sure the sidetone (in the 
menu) is set for that same pitch.

73,
Don W3FPR

On 6/20/2020 3:47 PM, Stephen Roberts wrote:
> I'm suddenly out of a signal. I get hiss but no signal. I'm using a k1 fil 2 40/20 board.
> 
> I was getting weak gain on the 40m side so went in to peak the L1/L2 L5/L6 Inductors.
> I messed about with them but was unable to peak them as I heard no change in the
> volume of the hiss.
> 
> I also tried C2 Gain tweak and not joy there either. I hear no change in the hiss volume
> as I turn it.
> 
> I rigged up my 7300 with a dummy load and xmitted on 7050 and 14050 and heard a signal
> but still no effect by changing L1/L2 or L5/L6
>