[Elecraft] Re: PLL Reference Oscillator

[Wayne Burdick]

Hi Daniel,

The PLL reference crystal we use is a special temperature-stable type with a
specific motional inductance that we custom order from ECS. Results with a
standard type purchased from Digikey are likely to be poor. But we will send you
one at no charge (just contact parts@elecraft.com).

There are many other possibilities besides the crystal: a poorly-tinned or
stripped lead on the toroid in the source circuit; a hair-line solder bridge
that conducts once the board reaches a certain temperature, a bad PLL chip, etc.
You might contact Gary (support@elecraft.com) for more ideas.

73,
Wayne
N6KR

Daniel Reynolds wrote:
> 
> I've had an intermittent PLL reference oscillator (based on frequency readings
> at TP3) for about the last month. Things would perk up if I grounded or used a
> DMM to probe between D16/L31 and ground. All voltages seem to be correct. I've
> replaced Q19 (J310) and D18 (1N4148) and the situation has not improved. Today,
> I was unable to resuscitate the oscillator. I'm guessing that X1 may be the
> culprit.....