2008-12-31 Leapsecond from HBG, DCF77 and MSF

Poul-Henning Kamp
Revision $Id: index.html,v 1.3 2009/01/01 15:27:25 phk Exp $

About the recordings

I sampled the radio spectrum up to about 200 kHz at 1MSPS with a 12 bit ADC.

The plots below show what the 3 european timesignals transmitted during the leapsecond.

The plots read like you would a book, one minute per line, starting at 22:48Z in the top left corner and ending at 00:09Z in the bottom right corner.

It looks like HBG got it right this time.

MSF still seems to have trouble with the DUT1 bits, the first minute they are changed, as they should be, next minute is back to the old ones, then they change to the new setting again.

HBG (75kHz) leap second

DCF77 (77.5kHz) leap second

MSF (60kHz) leap second

Waterfall displays from GNUradio

The leap second is at y-pixel 465.

The easiest way to find it is is to go down the 75kHz line until you get to 3 small blips.

The first picture shows MSF, HBG and DCF77.

I have not tried to decode the Russian timesignal at 66.66 kHz but a marker is clearly visible.

This one shows time blips for several LW stations, none at the same time...

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