[DSP-10] Intermittent PLL Lock Issue

[kd7ts]

On Wed, 25 Nov 2015 17:01:18 -0800, Richard Miller via DSP-10 <dsp-10 at mailman.qth.net> wrote:

>  All:
> I seem to be having a problem with the PLL. I am able to lock the PLL sometimes, and it will remain locked for a hour or two. Then for no real reason, the PLL will become unlocked. I am able to sometimes get it to relock by adjusting L102 for 127.335MHz when at 147MHz. This is not repeatable, and it does not always lock once again when adjusting L102 for the correct frequency. Once I achieve PLL lock, it will once again run for a few hours, and then come out of lock again. Anyone ever seen this issue? If so, what were your findings?
> Rich, AJ3G

Hi Rich,

In my case it was an intermittent BNC connector on the 10 MHz reference.

How do you know which PLL is causing the lock problem ? I seem to recall there are voltages associated with each PLL that can be measured, but I will have to look them up.

Mike KD7TS