[time-nuts] Beginners GPS locked frequency counter question
paulswedb at gmail.com
Sat Oct 31 10:41:20 EDT 2015
Chris welcome to the group.
The 1 or 2 Hz most likely is trigger and jitter. Its somewhat odd that you
are off by 2 Hz. Typically its 1 Hz.
I suspect you are also working 136 KHz. With respect to sound cards the
internal clock could be replaced and locked if its at all accessible. With
todays integration thats hard to say.
On Sat, Oct 31, 2015 at 6:50 AM, Chris Wilson <chris at chriswilson.tv> wrote:
> 31/10/2015 10:46
> I have a Racal counter locked to 1 MHz on its rear panel external
> input socket from my Trimble Thunderbolt GPS. I derive the 1 Mhz
> from a David Partridge divider board. If I also feed the counter
> with the 10 Mhz direct output from the same GPS it reads one or two
> Hz out. As I assume the counter is working purely mathematically
> why would that be please?
> As an aside, I work low frequency RF transmissions on 136 Mhz, and
> very narrow bandwidth. Can a soundcard be locked to GPS instead of
> its own internal crystal for precise frequency output?
> Best Regards,
> Chris Wilson.
> mailto: chris at chriswilson.tv
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