Re: LF: GPS Signals Accurate Now!!!

["f5maf" <f5maf@free.fr>]

Be carrful some time on EOM board ( TRIMBLE)

 the output PPS is open collector , you must use a 1K resistor (in pull up).

Normally PPS is automatic, any command.

Best 73 marc F5MAF

 

-----Message d'origine-----
De : Alberto di Bene <dibene@usa.net>
À : rsgb_lf_group@blacksheep.org <rsgb_lf_group@blacksheep.org>
Date : jeudi 4 mai 2000 17:44
Objet : Re: LF: GPS Signals Accurate Now!!!

>While we are discussing GPS, I have a question 
for all of you.
>I bought a few months ago an OEM 5000  GPS board, 
made
>circa 1993 by Magellan, because someone had told me that
>on 
the interface there were available the 1 pps signal derived
>from the 
received signals from the satellites, with the accuracy
>and stability of 
their Cesium clocks, +/- the SA.
>
>I was intending to homebrew 
something similar to the Shera
>project appeared in a past issue of 
QST.
>
>I have been unable to find that 1 pps signal, however. It 
just seems
>not to be present on the interface. But there is a 
hope.
>A few pins do not have signal on them, as seen on the 
'scope,
>but they have traces on the PCB leading somewhere. My last 
hope
>is that the 1 pps signal must be enabled by some command to 
the
>GPS unit.
>
>Can anybody shed some light on this ? 
Anybody on this list that
>has experience with the Magellan OM 5000 ? 
Thanks for any advice.
>
>Alberto    
I2PHD
>
>
>
>