LF: Re[2]: LF: VO1NA in Todmorden on 8270 Hz

[Alex K <rn3aus@mail.ru>]

I use simple circuit. It shortened 1pps pulse to about 15 ms and add NMEA to the right channel. It works very well. 155AG1 = sn74121

73 de Rn3aus

Суббота, 7 октября 2017, 23:58 +03:00 от DK7FC <selberdenken@posteo.de>:

Hi Joe, VLF,

Same problem at RC4HAA. They put their grabber online at
http://136.su/grabber/ and granted remote acces to their PC. The PPS
looks like in the attachment. Looks like a C is shorting the pulse.
However there should be no C in the circuit.
Has someone an idea? Does it happen on some soundcard types? Maybe a
large C like 1000uF would help?

73, Stefan

Am 07.10.2017 18:44, schrieb jcraig@mun.ca:
>
> Yes, pps and NMEA to SpecLab but evidently no discipline yet. The pps
> pulse looks strange on the SL scope and there are 'PPS zero-crossing
> too flat' debug errors on SL SR correction. This is all the NEO7M
> seems willing to provide at the moment; connecting the raspi3 to the
> tiny USB pins on the NEO7M was fun, but otherwise unproductive. I'm
> hoping it's possible to send commands directly to the neo7m via usb
> without a special chip.

1PPSconvertor.png
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