[time-nuts] LORAN-C

J. Forster jfor at quikus.com
Tue May 1 16:19:57 UTC 2012


I use a 1.000 MHz crystal oscillator module and a Tek DD501. It produces 1
pulse every (preset count-1) of input cycles. Triggering a scope is
trivial.

-John

=============



> 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.
>
> --
> Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
> phk at FreeBSD.ORG         | TCP/IP since RFC 956
> FreeBSD committer       | BSD since 4.3-tahoe
> Never attribute to malice what can adequately be explained by
> incompetence.
>
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