Set the scope sweep speed to 10 milliseconds per division and then even a
dull scope is easy to see. You are looking for trigger events from the 1PPS,
not the 1PPS itself.
John WA4WDL
--------------------------------------------------
From: "C. Turner" <[email protected]>
Sent: Monday, July 23, 2012 2:26 PM
To: <[email protected]>
Subject: Re: [time-nuts] Trimble T Lassen
2 -suitableantenna....advice.....questions
My old '465 will trigger on the 1pps, but it's far easier to see the
trigger LED flash than finesse the brightness/sweep to make it visible -
something possible only on a 'scope with a decently bright tube.
Another cheap/easy trick to detect the 1pps pulse is simply to "listen" to
it with an audio amplifier.
While it can be heard on my Tbolt and '3801 with just a headphone
connected, a cheap audio amplifier works better, stretching the pulse out
and making an obvious "tick" at the 1 PPS rate. I suppose that a
diode/cap (1N914/1000pf) could be used to further stretch it...
Clint
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