[ntp:questions] Radioclock connection via serial to usb adaptor on Linux or BSD?

Rob van der Putten rob at sput.nl
Fri Aug 28 08:48:35 UTC 2009


Hi there


David Lord wrote:

> I've recently been trying various radioclocks, gps, DCF77 and now MSF.
> I have problems with reception being in a valley with horizon over
> most of 360deg being 50m or so above the house. Cloudbase is often
> below height of surrounding hills.
> 
> On good days Garmin GPS-16-LVC has given around 2us (NMEA + PPS),
> Conrad module DCF77 reception over about 1000km is lost most
> evenings and early mornings but otherwise about 850us (Radioclkd2
> + SHM), and Conrad module with 60kHz and frame aerial for MSF
> has done 65hr at reach of 377 for 175us (Radioclkd2 + SHM). Those
> offsets are mid values rather than averages.
> 
> I'd now like to try via a serial to usb for use with notebook. My
> Vodafone mobile broadband connection regularly has differential
> latency of maybe +/- 2 seconds and even chrony can't make sense
> of this.
> 
>  From what I've read there are many serial to usb devices that
> require their own drivers to provide full rs232 control lines.
> PPS and radioclkd2 all require at least usable DCD and for
> radioclkd2 I need one or both CTS and DSR as well.
> 
> Can anyone here advise regarding serial to usb adapters on
> Linux/BSD?

AFAIK USB (ESP 232 over USB) causes timing problems. You are probably 
better off with syncing over ethernet.


Regards,
Rob
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