[time-nuts] Trimble T Lassen 2 -suitableantenna....advice.....questions

[jmfranke]

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" <turner at ussc.com>
Sent: Monday, July 23, 2012 2:26 PM
To: <time-nuts at febo.com>
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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