Gary try France Inter from Allouis on 162kHz. That is Rb (or Cesium)
controlled as well and should be good to parts in 10^10 (of course they will
be French parts... :-)) )
My local standard seems to have drifted about 180degrees in the last hour as
measured at 1MHz, that's approaching parts in 10^10 but its my local
standard that is off !!
Alan
----- Original Message -----
From: Gary - G4WGT <[email protected]>
To: <[email protected]>
Sent: 07 June 2006 21:46
Subject: LF: RE: Re: RE: BBC 198kHz
> Hi Peter,
>
> I have carried out the same comparisons again ie. 60KHz, 75KHz & 77.5KHz
> against 198KHz & BBC 198KHz is 1Hz high, tested at 2035z. Could there be
an
> error in respect of the frequency difference in the receivers band set up
> although I believe the range is in the same band on my JRC NRD-345. When
> compared with DFC39 (accuracy of this station not known to me) there is a
> difference of 0.5Hz. Is there another accurate signal nearer 198KHz with
> which to compare?
>
> 73,
>
> Gary - G4WGT
>
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]]On Behalf Of Peter Martinez
> Sent: 07 June 2006 21:20
> To: [email protected]
> Subject: LF: Re: RE: BBC 198kHz
>
>
> 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
>
>
|
