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| To: | [email protected] |
|---|---|
| Subject: | Re: LF: Octo-soundcard for the Raspi |
| From: | Paul Nicholson <[email protected]> |
| Date: | Sat, 17 Jun 2017 10:25:49 +0000 |
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Terry wrote: > I have to sort out now is the timing pulse. it looks > horrible on vtscope, a sort of double humped thing I'd guess you have some high pass applied to the shaped PPS, perhaps the input stage of the Octo? Does it look anything like http://abelian.org/vlf/tmp/170617a.gif Is it possible to reduce the PPS pulse width? Say to 10mS or 5mS? > Are you using a square pulse from the GPS to feed > the RC conditioner? Yes, it's a 2mS rectangular pulse from the GPS, through a buffer (a hex inverter), then a simple RC low pass filter to shape the pulse suitably for centroid measurement. -- Paul Nicholson -- |
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