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From: "Peter Martinez" <peter.martinez@btinternet.com>
To: <rsgb_lf_group@blacksheep.org>
References: <NKEMLGOEKANPNJOBFBAFEECNCNAA.g4wgt@tiscali.co.uk>
Date: Wed, 7 Jun 2006 20:19:34 -0000
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Subject: LF: Re: RE: BBC 198kHz
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>From G3PLX:

On seeing the report of Droitwich being off frequency, I connected up my 
Clicklock set-up, which enables me to measure off-air signal phase relative 
to GPS.

I have to run the system with no antenna in order to get Droitwich low 
enough in level, and that makes the measurement a little sensitive to 
disturbances in the shack, but this is a disturbance in both amplitude and 
phase, and it's quite easy to see that the few degrees wobble I am seeing in 
the phase is the same as the wobble in amplitude, and is not due to a 
systematic drift in phase. A random distrbance results in a blob on the 
vectorscope. A frequency error shows as an arc around the origen.

If it had been 1Hz off, I would have expected to see a change of 360 degrees 
PER SECOND, i.e. a full circle rotating once/sec.  All I can see is a 
circular blob about 2% amplitude, and that's over the last 20 minutes.

I would say Droitwich is spot-on.  Has anyone who saw it off frequency 
checked it again (since 20:00 utc) to see if it's back on frequency? Was it 
off frequency and it's back again, or maybe it was never off.

73
Peter