Message-ID: <005d01c36167$e820df20$a3ce28c3@bryan2>
From: "captbrian" <captbrian@ukonline.co.uk>
To: rsgb_lf_group@blacksheep.org
Date: Wed, 13 Aug 2003 07:54:59 +0100
MIME-Version: 1.0
Subject: Re: LF: Re: Re: BBC R4 LW "Frequency Standard"
Content-Type: text/plain; charset=iso-8859-1; format=flowed
Content-Transfer-Encoding: 8bit
Sender: <owner-rsgb_lf_group@blacksheep.org>
Precedence: bulk
Reply-To: rsgb_lf_group@blacksheep.org

My 2 - penn'orth is that from frequent observation [reception in moving
car ]  R4 LW ceases very abruptly at Lyon.
-----Original Message-----
From: flo flo <hellozerohellozero@hotmail.com>
To: rsgb_lf_group@blacksheep.org <rsgb_lf_group@blacksheep.org>
Date: 12 August 2003 21:44
Subject: Re: LF: Re: Re: BBC R4 LW "Frequency Standard"


>...and R4 is pretty weak here in Alaska  too compared with its Eureopean
>counterparts across the Marche/channel (often some 20-30 dBs stronger) -
Ive
>only managed to listen to cricket test match special on a few occasions -
>and the freq is shared in an NDB Canadian Beacon some 600 miles south too
>which doesnt help.
>
>R4 LW 198Khz  in Aberdeen Scotland was appauling - and that why they had a
>MW relay...AM phase and all that...
>
>Given the Power differences in some of the European LW  stations R4 is very
>much weaker than I would have imagined here, but, there are more than one
>variables that influence signals quality and strength. I presume the R4 LW
>station doesnt "beam" or does it?
>
>Given the "speed"/sheer of the particles in the ionosphere - and they would
>have to be moving quite fast; might we not see some blurring of phase from
>the two locked sources?
>
>Beacon
>
>...and the WD2XDW beacon will be on from 0001Z on around 137.773Khzish
until
>advised. I might get the locked freq source sorted tonight. The matching
>system is now under cover and no deterioation of aerial current has been
>seen. Around 2.3 amps.
>
>
>Laurence - rainy Anchorage
>
>>From: "Alan Melia" <Alan.Melia@btinternet.com>
>>Reply-To: rsgb_lf_group@blacksheep.org
>>To: <rsgb_lf_group@blacksheep.org>
>>Subject: LF: Re: Re: BBC R4 LW "Frequency Standard"
>>Date: Tue, 12 Aug 2003 20:30:48 +0100
>>
>>Hi Hugh, yes I supose it would have some effect. The advantage is that all
>>the transmitters are under "atomic" control so there is almost a
continuous
>>phase difference between their carriers. The "mush" area, I think, refers
>>mainly to the reception and demodulation of the AM program material. I
>>suppose within ground-wave range there is "beat" when the strengths from
>>Droitwich and say Westerglen are approximately the same ....the beat
>>frequency would not more than 0.00001Hz or about 1 cycle in 30 hours (I
>>hope
>>my thumbnail calcuation is right....but I sure someone will tell me if it
>>isn't). I dont expect that would give much problem but the path
differences
>>from the different tranmitters might give some interesting effects at
>>distance. The only person I know who does monitor R4 is Laurence in
>>Anchorage.
>>
>>Cheers de Alan G3NYK
>>alan.melia@btinternet.com
>>
>>----- Original Message -----
>>From: "Hugh M0WYE" <m0wye@thersgb.net>
>>To: <rsgb_lf_group@blacksheep.org>
>>Sent: 12 August 2003 16:21
>>Subject: LF: Re: BBC R4 LW "Frequency Standard"
>>
>>
>> > Hi Alan, Group,
>> > Interesting article about BBC R4 LW.
>> >
>> > Does the fact that there are multiple transmitters on this frequency
>>have
>> > any bearing on those who might use the 198kHz signal as a propagation
>> > indicator outside of the UK ?
>> >
>> > Presumably the interference pattern ("mush area") extends way beyond
our
>> > shores, and someone monitoring, say in the 'States might receive a weak
>> > signal, not because there was no propagation, but because the two
>> > transmitters happened to be in cancellation.
>> >
>> > I assume the signals that we might use for reference, such as DCF39,
>>have
>> > only one source.
>> >
>> > 73
>> > Hugh M0WYE
>> >
>> > ----- Original Message -----
>> > From: "Alan Melia" <Alan.Melia@btinternet.com>
>> > To: "LF-Group" <rsgb_lf_group@blacksheep.org>
>> > Sent: Tuesday, August 12, 2003 3:57 PM
>> > Subject: LF: BBC R4 LW "Frequency Standard"
>> >
>> >
>> > > Hi All, I have posted the latest DTI Time & Frequency Club Newsletter
>>to
>> > my
>> > > web site. It contains a short description of the frequency control of
>>the
>> > > BBC Radio 4 Longwave  transmitters on 198kHz, together with details
of
>>the
>> > > phase modulation data service it also carries on the carrier. This
>>will
>>be
>> > > interesting information for those of you who, like me, may have a
>>198kHz
>> > > off-air standard in your workshop.
>> > >
>> > > Download of the 68kB pdf file is available from the link in the
>>contents
>> > > section on the index page.
>> > > http://www.alan.melia.btinternet.co.uk/
>> > >
>> > > Cheers de Alan G3NYK
>> > > alan.melia@btinternet.com
>> > >
>> > >
>> > >
>> > >
>> >
>> >
>>
>>
>
>_________________________________________________________________
>STOP MORE SPAM with the new MSN 8 and get 2 months FREE*
>http://join.msn.com/?page=features/junkmail
>
>
>