[Elecraft] K2 low AGC threhold

[John Huffman]

Howard -

> Has anyone completed a K2 with the low AGC threshold
> voltage? Was it a problem? I have 3.84 with R1 full
> counter-clock wise.

I built my K2 sn3000+ and got 3.83 volts.  I called and the boys said, "no
problem."

After using it a while, I saw the AGC was too strong.  The test is to turn
AGC on and off while listening to an empty band.  Turning the AGC on made
the noise quieter, thus the AGC was kicking in too soon.

I adjusted R1 until the noise was just the same in and out, but verified
that with AGC in, strong stations were suppressed.  The correct setting for
me was with R1 at less than half the maximum.

This shows that 3.83 volts, or whatever, is much too much AGC and there's
nothing to worry about.  You will end up turning R1 down anyway.

> When I did bargraph current test the current "jumped"
> between .22 and .24. It would not "lock in".
> Is this normal?

Page 46, step 6 I got E13.1 i 0.06
Page 46, step 7 I got E12.7 i 0.22
If by not locking you mean the last digit fluctuates by one number, that's
normal.

My guess is that all is well.

73 de NA8M
John