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

from [Clemens Paul] [Permanent Link][Original]
To: <[email protected]>
Subject: Re: LF: Re: WRC-12 Approves the New 472-479 kHz Amateur Radio Allocation
From: "Clemens Paul" <[email protected]>
Date: Wed, 15 Feb 2012 22:40:17 +0100
References: <6C05E5021A484E229E4D20124C3D4AA9@TraceyPC> <002d01cceb30$87c42cc0$0401a8c0@xphd97xgq27nyf>,<[email protected]> <7E7DFBB4D102A04DB5ADC88D66628A4A015771@ICTS-S-MBX5.luna.kuleuven.be>
Reply-to: [email protected]
Sender: [email protected] 

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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