[ntp:questions] Re: PPS from TrueTime 468-DC GOES Time Receiver (with GPS antenna)

Hal Murray hmurray at suespammers.org
Thu Aug 24 21:11:28 UTC 2006

In article <1156450631.842127.105780 at 74g2000cwt.googlegroups.com>,
 "simonpg" <paul at thesimonet.org> writes:
>So I have this fine receiver and have been a member of pool.ntp.org for
>several years.  But I would like to take advantage of the PPS signal.
>The downside is that I have no idea where to start.  The upside is that
>I can solder and read a simple schematic diagram.  Any ideas?
>This is the first time in many years that I have used usenet.  I am
>trying the google interface.  My point is that I'm not totally
>confident that I will see any posts to this thread.  So please feel
>free to send e-mail; I'm sure the spammers will.

Have you found the web page for the driver?
(That may not be the latest one, it's just what google found for me.)

Lots of info here:
That doesn't mention a PPS signal.  It says the signal is 468 MHz
so I wouldn't be surprised if a GPS antenna filtered that out.

The usual approach with a PPS signal is to connect it to
one of the RS-232 modem control signals.  (I forget which one, but
it should be easy to find.)  Most of the PPS signals are TTL levels
rather than RS-232.  If you want to get fancy you can wire up a
level converter (MAX-232) type chip but it will almost-for-sure
work with a direct connection.  You do have to get the inversion
right though - MAX-232 type chips are inverters.  Software can
normaly use either.

Once you get the signal into your box, try the ATOM (aka PPS) driver.

Is GEOS still working?  I found this note from June 2005 saying it
was going off the air:

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