[time-nuts] Re: RFTGm-II-XO L108 &L109 Oscillator PLL Failure

[Szeker K.]

Jerry,

maybe you have some old Tantals in short?

Karl

Am Fr., 5. Nov. 2021 um 01:21 Uhr schrieb <k1jos at att.net>:

> My earlier post described a problem where the XO failed to see any
> satellites after many years of continuous use.  This turned out to be a bad
> Oncore UT+ GPS and after replacing it, the XO quickly tracked and locked a
> 3D fix onto 4 satellites.   I left it open out of the chassis on the bench
> thinking I would next do a 15-->10Mhz conversion but I noticed after a hour
> or so that a new fault appeared "OSC PLL LOCK FAILURE".  I power down and
> up
> and again looked fine for a while but the same fault reappeared.  I checked
> the Datum 10Mhz output before and after and it was within some 10mHz.  No
> change before or after the fault in control voltage (~15vdc), Temp (39.5C),
> Ant Feed current (16mA), Osc voltage (~23vdc) .     However the VFC
> initially was 4.85 and at time of failure it was 0.275vdc.  I assume that
> issue could be excessive Datum osc jitter or poor VFC, etc.  Is tracking
> down the problem worth the effort? .     I would like to try a repair if
> only to hone my skills so any advice would be very much appreciated.
>
> Jerry NY2KW
>
>
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