AW: [Elecraft] K2 - VCO-Test (Alignment an d Test, Part II)

[David Broger]

Hi Michael

>Put a 2.2 kOhm resistor across terminal 1 and 2 of T5 as a test.
>This should drop the Q to 50, loading it down real good.  If that
>makes things better, then C68 must be too much feedback, too
>large a value.  Perhaps reduce C68 to 4.7 or 5 pF as in the
>pre-160 meter kits.

With the 2.2kOhm resistor the frequency is stabil at 8.9MHz. But I have the
same effect when I tip with one end of the resitor at terminal 2.... I can
take any metal piece and I have this effect. When I take a plastic tool then
is no effect. So I think it's not the 2.2kOhm resistor

>Or the other possibility:

>Put 5 pF in parallel with C68 as a test.  This should increase feed back.
>If that makes things better, then C68 is not enough feedback,
>so perhaps Q18 is sick.

I have no 5pF so I took 2.2pF -> the counter showed 7.8MHz but not stabil
(+/-50kHz)
With 12pF it's 8.9MHz and stabil!


73 de David