[time-nuts] DST change on DCF77

[Pieter-Tjerk de Boer]

Hello Peter,

While monitoring DCF77, MSF, and other longwave time signals during the
DST change this weekend, I did not observe any irregularities.
I don't have a recording of the raw signals, but here is the decoded data,
including reception timestamps in the last column:

BBC:                 00:58        1572137879.092676
DCF77_PM: 2019-10-27 02:58        1572137880.001366
DCF77_AM: 2019-10-27 02:58        1572137880.001398
TDF:      2019-10-27 02:58 +0200  1572137880.001817
MSF:      2019-10-27 01:58 +0100  1572137880.002950
RBU:      2019-10-27 03:58 +0300  1572137880.006877

BBC:                 00:59        1572137939.092602
DCF77_PM: 2019-10-27 02:59        1572137940.001373
DCF77_AM: 2019-10-27 02:59        1572137940.001407
TDF:      2019-10-27 02:59 +0200  1572137940.001608
MSF:      2019-10-27 01:59 +0100  1572137940.002951
RBU:      2019-10-27 03:59 +0300  1572137940.006869

BBC:                 01:00        1572137999.092559
DCF77_PM: 2019-10-27 02:00        1572138000.001382
DCF77_AM: 2019-10-27 02:00        1572138000.001419
TDF:      2019-10-27 02:00 +0100  1572138000.001550
MSF:      2019-10-27 01:00 +0000  1572138000.002903
RBU:      2019-10-27 04:00 +0300  1572138000.006862

BBC:                 01:01        1572138059.092783
DCF77_PM: 2019-10-27 02:01        1572138060.001379
DCF77_AM: 2019-10-27 02:01        1572138060.001415
TDF:      2019-10-27 02:01 +0100  1572138060.001530
MSF:      2019-10-27 01:01 +0000  1572138060.002906
RBU:      2019-10-27 04:01 +0300  1572138060.006861


BBC is the phase modulation on their 198 kHz AM transmitter, encoding UTC.
DCF77_PM and _AM are the phase and amplitude modulation of DCF77 on 77.5 kHz.
TDF is the French 162 kHz signal.
MSF is 60 kHz from the UK.
RBU is 66⅔ kHz from Russia, where no DST change was made this weekend.

The last column is the reception time as a Unix timestamp, w.r.t. a LORAN-synchronized clock.
Clearly, the BBC signal is about 0.9 s early; the others are slightly late
due to propagation time from their transmitters to my receiver location
(Enschede. The Netherlands).

Regards,
  PieterTjerk, PA3FWM


On Mon, Oct 28, 2019 at 06:26:05PM +0000, Peter Vince wrote:
> Was anyone here monitoring DCF77 during the summer-time change this
> weekend?  An acquaintance has recently modified his code that receives MSF,
> and noticed an anomaly - his log shows the minute 02:59 CEST was missing.
> It seems tremendously unlikely that there was any kind of fault with DCF,
> but sadly he doesn't have a recording of the actual RF signal, just his
> decoder output.  So I was just wondering if anyone else noticed anything
> untoward, or maybe even, does anyone have a recording of the signal itself?
> 
>      Thank you,
> 
>           Peter
> _______________________________________________
> time-nuts mailing list -- time-nuts at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.