Walt via time-nuts writes:

what happens if you enter 59900 ?  It may simply want the GRI in microseconds.

--
Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20
phk@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.

I believe you are correct; it wants the GRI in milliseconds.  "59900 GRI"
can be entered and the unit will go into ACQUIRE mode.  But it stays in
ACQUIRE indefinitely, and I wanted to make sure I wasn't entering the GRI
incorrectly.  I suspect the signal is overloaded by noise, and my passive
LORAN whip isn't helping.

If the GRI has units of milliseconds (e.g., 59900), where did the shortened
version of the GRI (e.g. 5990) come from?

Using KiwiSDR stations near me and in the Eastern part of Washington, I can
clearly see 9 bursts on 5990 (5991), and so I am optimistic that an active
loop will help.

-----Original Message-----
From: Poul-Henning Kamp via time-nuts time-nuts@lists.febo.com
Sent: Thursday, December 12, 2024 11:47 PM
To: Discussion of precise time and frequency measurement
time-nuts@lists.febo.com
Cc: Walt walt@drizzle.com; Poul-Henning Kamp phk@phk.freebsd.dk
Subject: [time-nuts] Re: Austron 2100F and 4-digit GRI

Walt via time-nuts writes:

what happens if you enter 59900 ?  It may simply want the GRI in
microseconds.

--
Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20
phk@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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It is 59900 then hit GRI that will do it.
Next step 1 acquire

On Fri, Dec 13, 2024 at 2:53 AM Poul-Henning Kamp via time-nuts <
time-nuts@lists.febo.com> wrote:

Walt writes:

I suspect because the first hardware was based on a 100kHz clock ?

Do you see a signal which looks like this ?

|-|-|-|-|-|-|-|---|

I have a faint memory that the 2100x receivers really dont want to lock unless
they can find the master signal, and as I understand it, during these tests,
only slave signals are being transmitted.

--
Poul-Henning Kamp      | UNIX since Zilog Zeus 3.20
phk@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.

The onair signal is a secondary with a half high 9th data pulse. Thats
eLORAN. No masters.
The 2100f is very happy to find it.
The 2100T however really would like to see a master. So on the T you have
to advance to the next station.
I realize this last statement is tricky as that seems to be the way it
works. Or you can tell the T to acquire a secondary.
Good luck
Paul
WB8TSL

On Fri, Dec 13, 2024 at 2:04 PM Poul-Henning Kamp via time-nuts <
time-nuts@lists.febo.com> wrote:

Hi Walt:

I have some information on the 2100F and 2100T at:
https://prc68.com/I/A2100F.shtml

--
Have Fun,

Brooke Clarke
https://www.PRC68.com
axioms:

1. The extent to which you can fix or improve something will be limited by how well you understand how it works.
2. Everybody, with no exceptions, holds false beliefs.

-------- Original Message --------

George is transmitting with Master Phase encoding, no master pulse, and a position modulated 9th pulse.
Fallon is transmitting with Secondary phase encoding, and a position modulated 9th pulse.
Havre is transmitting with Secondary phase encoding, and no 9th pulse.

Ralph
AB4RS