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LF: Re: [rsgb_lf_group] Re: Band Planning for 472 Khz Band ?

To: <[email protected]>
Subject: LF: Re: [rsgb_lf_group] Re: Band Planning for 472 Khz Band ?
From: "mal hamilton" <[email protected]>
Date: Fri, 15 Jun 2012 14:57:17 -0000
Cc: "rsgb" <[email protected]>
References: <[email protected]>
Reply-to: [email protected]
Sender: [email protected]
Graham
This particular piece of spectrum was NOT a good choice for radio amateur use. Like Tracy said the majority of the NDB'S are audible in the UK and some very loud during the dark hours.
It is only really suitable for CW qso mode where the operator can dive in/out of vacant slots at the time.
For Opera or other data modes it will be difficult where a SLOT has to be specified because there are quite dramatic propagation changes taking place especially in the dark hours and you could well end up on top of a NDB or several.
The same applies on 160 metres where band condx change all the time, fortunately there are no NDB'S to contend with.
It is not surprising commercial operators did not see this part of the spectrum as useful except all NDB'S QRT.
NDB'S are still a useful nav aid for the Aeronautical service es others so I cannot see them switching off.
G3KEV
 
----- Original Message -----
From: graham787
Sent: Friday, June 15, 2012 2:38 PM
Subject: [rsgb_lf_group] Re: Band Planning for 472 Khz Band ?

 

This is going to be a nightmare, more like a downhill slalom course than a band allocation

Has anyone a graphic of the band and beacon allocations what shows where the gaps are ?

G..

--- In [email protected], "Mike Dennison" <mike.dennison@...> wrote:
>
> Guard bands for all 27 listed NDBs would present a problem as the MCW
> receivers would be at least 2.5kHz wide. Fortunately, any
> interference from amateurs is likely to be extremely local. Our small
> signal working is likely to suffer more QRM =from= the NDBs than to
> them.
>
> Mike, G3XDV
> ==========
>
> > Twenty-seven NDBs have been logged in Europe between 472-479kHz.
> > Twelve of those have been logged from the UK.
> > The NDB database on the Classaxe web site would provide detailed
> > information on frequencies which should be avoided. It should be borne
> > in mind that the NDBs use A2 mode with a mix of approx 400Hz and
> > 1020Hz modulation, so there are a good number of specific slots to be
> > wary of.
> >
> > http://www.classaxe.com/dx/ndb/reu/
> >
> > Perhaps some consideration should be given to setting up some form of
> > guard bands/frequencies in order to avoid any problems with NDBs?
> >
> > 73s Tracey G5VU
>

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