[Elecraft] Trouble with K2 PLL reference oscillator

[Don Wilhelm]

Luc,

It certainly sounds like a marginal PLL crystal to me, or possibly a failing
Q19.  I would arbitrarily replace both of them.

73,
Don W3FPR

> -----Original Message-----
>
> Hello YLs and OMs,
> I have an annoying trouble with the PLL reference oscillator in my K2
> (1028):
> I use the K2, ever for hours, without any trouble. I switch it off.
> I switch it on within minutes : the PLL reference oscillator does'nt
> oscillate anymore
> I switch the K2 off and wait for 10 to 20 minutes : the PLL reference
> oscillator starts then like a charm.
> Of course, I've inspected and redone all the solder joints, looked for
> solder bridges, defect or unsoldered parts, and even more. I've
> tested  the
> oscillator transistor Q19 and the diodes D18 and D16, looked for defect
> resistors or chokes (L31) and other discontinuities without detecting
> anything false or suspect.
> I tried to reproduce the trouble by heating the board with an hair dryer,
> without any success.
> Has anyone verified such a annoying behaviour ?
> Any idea ?
> Thanks for help and suggestion.
> 73
> Luc F6HJO/HB9ABB
>