[time-nuts] LORAN-C

Stan, W1LE stanw1le at verizon.net
Tue May 1 19:16:12 UTC 2012


Hello PHK,

Thanks for the tips.  I have not done this yet, so I am creeping along.
I also have a 33120A with the the option 001 for using an external 
reference.
Sounds like the arbitrary signal capability is the way to go,
If I can not find an appropriate 2100/2100F output.

Thanks   Stan, W1LE     Cape Cod


On 5/1/2012 12:02 PM, Poul-Henning Kamp wrote:
> In message<4FA006E8.5040304 at verizon.net>, "Stan, W1LE" writes:
>
>> I will use a HP-3336C with the station 10 MHz (GPS/DO) reference.
>>
>> Typo:  trigger should really be 11.148272 Hz instead of KHz !
> You need a really amazing stable and noise-free trigger to lock
> onto a 5.5Hz (see below) sine at the required level of stability
> (~2usec).
>
> I used my HP33120A once, but its square output is made with a
> comparator on the sine wave, and has pretty bad jitter.
> Switching to saw-tooth solved that, defining my own arbitrary
> square-wave was even better, not sure why.
>
> You want 1/(2*.089700) = 5.574136 Hz, otherwise every other
> loran-c pulse will cancel out due to the A/B coding polarity.
>
> If you don't have a counter-based signal generator, consider stealing
> a GRI or FRI-rate signal from one of your loran-C receivers, I belive
> the AUSTRON 2000/2100 offers it on a BNC at the backside.
>




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