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

[Andy Talbot <andy.g4jnt@gmail.com>]

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

www.g4jnt.com

 

 

On 15 February 2012 21:40, Clemens Paul <cpaul@gmx.net> 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