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Re: LF: Re: WRC-12 Approves the New 472-479 kHz Amateur Radio Allocation

To: [email protected]
Subject: Re: LF: Re: WRC-12 Approves the New 472-479 kHz Amateur Radio Allocation
From: Andy Talbot <[email protected]>
Date: Wed, 15 Feb 2012 21:45:10 +0000
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But what is interference?  
If none is reported, none is caused.
 
And who is going to report interference to a service no one uses
 
'Andy
 


 
On 15 February 2012 21:40, Clemens Paul <[email protected]> wrote:
Greetings all,

I wonder what "secondary user on non-interference basis" means in practice.
As we know most NDBs are AM modulated with about 1kHz.
Now it would be interesting to know what selectivity/bandwidth DF receivers
for NDBs in aeroplanes might have.
Imagine they have 1kHz or even 2kHz (quite possible).
For non interfering such a receiver one would have to stay well without that
BW.
Hence with a few NDBs spread between 422 and 479kHz there would
virtually remain no usable frequency for us amateurs if we wanted to make
100% sure not to interfere any aeroplanes' beacon reception.

73
Clemens
DL4RAJ



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