Re: Receive NDB beacons ?

From: Tim Wescott (tim_at_wescottnospamdesign.com)
Date: 07/26/04 

Date: Mon, 26 Jul 2004 12:56:51 -0700

John Woodgate wrote:
> I read in sci.electronics.design that Damien Teney <dteney@hotmail.com>
> wrote (in <WvSdnfBdaO5H2JjcRVnyhg@scarlet.biz>) about 'Receive NDB
> beacons ?', on Mon, 26 Jul 2004:
>
>>I wonder if anyone has already tried to receive the signal of NDB
>>beacons ? These are long-range radio beacons, used by aircrafts for
>>navigation, operating in the frequencies from stg like 200 to 500 KHz I
>>think. Their signal is AM-modulated with a sound signal of their code
>>(three letters) in morse.
>>
>>It would be an interesting project to build a receiver and ADF for these
>>beacons, but I'd like to know if anyone has already tried that.
>
>
> Some AM radios for the Swiss market go up to 285 kHz on the LF band.
> Some beacons can be heard. You can modify an MF radio to receive 250 to
> 420+ kHz, but you can't get too close to the IF, which may be 450, 455,
> 459, 468 (+ n x 9 kHz) .... kHz.

I never knew about the 450 + n x 9 business -- do you know why that is so? 

-- 
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com

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