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Hi Andy, that plot has all the indication of a
"trip" .....maybe a mouse of a very (very) big spider in the loading coil :-))
the exciter would continue, only the PA would trip, so it would come back
in sync.
There never seemed to be power changes at Rugby but
now under commercial contract with Babcock (ex VT comms) there are obvious
pressures to keep costs down. As far as I am aware from old T&F
Club meetings at Teddington around when the move first occured the
contract on lt calls for a minimum field strength over the UK. So I suppose they
would be justified in reducing the power at night, though I have never seen that
acknowleged anywhere. Out of interest my cheapie clock took an extra 24 hours to
sync after the hour change.
I have pinged the Radio Astro group to see if there
are other recordings.
Alan
G3NYK
----- Original Message -----
Sent: Sunday, November 08, 2015 7:08
PM
Subject: LF: MSF Oddities
I've been using the MSF 60khz signal as a test source for
cohernet LF Rx development. And in doign so I've noticed a couple of
oddities
First was tonight, see http://www.g4jnt.com/DownLoad/MSF_Log2.jpg
where it appears to have dropped for a few minutes round about
1715z. I didn't catch this in real time to check and only saw the plot
afterwards, but fail to see how that could be a software glitch that recovered
so perfectly afterwards.
Also note the reduction in power around 1800. I spotted this
yesterday too - and that was confirmed by listening on another receiver.
The signal really was several dB weaker after, AFAIR, about 1800 ish.
So it looks as if they may drop the power after dark when propagation is
expected to be at its best.
Once again, blame the VE2ZAZ GPSDO for the phase shift of something like
40 degrees over 2 hours. That corresponds to only 2.5* 10^-10 at
60kHz , but is very noticeable on plots such as this.
Andy G4JNT
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