[Collins] Re: New Carrier Oscillator Crystals

[Jim Brannigan]

The crystals usually don't fail, they drift off frequency.  With the S-line
in transceive, the receiver supplies HFO and PTO to the transmitter.  The
carrier oscillators are not shared, they are independent.
The first sign of trouble is someone saying "you are off frequency".  If
they get very far off frequency then the relationship with the filters
becomes an issue.

Jim

> > FYI  For those of you who need to replace the carrier oscillator
crystals in
> > your Collins
>
> Why would I need this?
>
> Do carrier crystals fail over time?
>
> I guess these are "critical" as they are geometrically locked to the
> mechanical filters.
>
> de ah6gi/4