Received-SPF: neutral (gmail.com: 193.82.116.20 is neither permitted nor denied by best guess record for domain of owner-rsgb_lf_group@blacksheep.org)
Message-ID: <0b7401c68a7b$73308d10$7900a8c0@athlon1200>
From: "Dave Brown" <tractorb@ihug.co.nz>
To: <rsgb_lf_group@blacksheep.org>
References: <NKEMLGOEKANPNJOBFBAFKECOCNAA.g4wgt@tiscali.co.uk>
Date: Thu, 8 Jun 2006 09:43:44 +1200
Mime-Version: 1.0
Subject: LF: Re: RE: Re: RE: BBC 198kHz
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; format=flowed; charset=iso-8859-1; reply-type=original
Sender: owner-rsgb_lf_group@blacksheep.org
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org
Status: O

It would be interesting to have the details of the frequency measuring 
setup for the stations measuring with the 1 Hz error. Is there a 
common factor?

DaveB, ZL3FJ


----- Original Message ----- 
From: "Gary - G4WGT" <g4wgt@tiscali.co.uk>
To: <rsgb_lf_group@blacksheep.org>
Sent: Thursday, June 08, 2006 8:46 AM
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: owner-rsgb_lf_group@blacksheep.org
> [mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Peter 
> Martinez
> Sent: 07 June 2006 21:20
> To: rsgb_lf_group@blacksheep.org
> 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
>
>
>
> -- 
> No virus found in this incoming message.
> Checked by AVG Free Edition.
> Version: 7.1.394 / Virus Database: 268.8.2/357 - Release Date: 
> 6/06/2006
>
> 


-- 
No virus found in this outgoing message.
Checked by AVG Free Edition.
Version: 7.1.394 / Virus Database: 268.8.2/357 - Release Date: 6/06/2006