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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 15:08:34 -0000
Cc: "rsgb" <[email protected]>
References: <[email protected]>,<[email protected]> <7E7DFBB4D102A04DB5ADC88D66628A4A0FAADC2B@ICTS-S-MBX5.luna.kuleuven.be>
Reply-to: [email protected]
Sender: [email protected]
 
 
You are forgetting about the USER. It depends where they are flying at the time, they might well be closer to an amateur transmission than the NDB and the amateur could be blocking the frequency.
They are not just local approach nav aids. They are often picked up a few hundred miles away and used for cross checking and used more often than you think. 
g3kev
 
 
----- Original Message -----
Sent: Friday, June 15, 2012 2:46 PM
Subject: RE: [rsgb_lf_group] Re: Band Planning for 472 Khz Band ?

 

I agree with Mike: it's going to be a local problem.

Typical NDB service ranges are 50-100km and they run similar power (50-500W) than we do.

It is very unlikely that we will ever cause any harm to an NDB that's 500km and more away.

So nothing to worry about in the UK, Belgium, Netherlands, Westen-Germany, ...

More east it may be wise to stay away from NDB's that are close.

 

73, Rik  ON7YD - OR7T

 


Van: [email protected] [[email protected]] namens graham787 [[email protected]]
Verzonden: vrijdag 15 juni 2012 16:38
Aan: [email protected]
Onderwerp: [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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