From: Ralf Baechle DL5RB (terhi.victor@logonet.com)
Date: Thu May 27 2004 - 16:05:14 EEST
On Thu, May 27, 2004 at 01:30:25PM +0200, G?nther Montag wrote:
> does someone know, is there something lik a beacon on the air on shortwave or
> medium wave, ham or radio band, which sends a known fixed exact frequency
> tone in AM, e.g. 1000 Hz or other, for calibration?`
> Something like DCF77 on longwave?
>
> We have a real-time pactor program which needs an exact frequency for
> calibration, and not everyone has an DCF77 receiver.
A few shortwave stations among them DW have a reputation for a highly
accurate carrier frequency. There are also the usual time stations such
as WWV on shortwave. Within Germany ZDF's signal makes a good timebase;
a few years ago description how to build a highly accurate frequency
normal based on this signal have been published.
73 de DL5RB op Ralf
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