Re: Receive NDB beacons ?
From: Tam/WB2TT (t-tammaru_at_c0mca$t.net)
Date: 07/26/04
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Date: Mon, 26 Jul 2004 16:38:40 -0400
"Tim Wescott" <tim@wescottnospamdesign.com> wrote in message
news:10gaofq3iuq6q25@corp.supernews.com...
> John Woodgate wrote:
............................
> > 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
Tim,
Let me take a wild guess that makes sense. You want the local oscillator
frequency to be a multiple of 9 KHz (The EU channel spacing) to make it
simpler to design the PLL. Seems that 450 would work with both 9 and 10 KHz
spacing.
Are they still using the NDB stations? seems kind of redundant with VOR,
that has been around for 50 years or so.
Tam
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