[Lowfer] KFI Captures and stability of AM Stations

[Jay Rusgrove]

Les

The receiver setup I'm using here has all the oscillators tied to GPS so there
is essentially no drift - maybe .02 Hz ... so the signals in the capture below
are exactly as they appear. I've monitored a number of am station carriers over
the last couple years and many are, indeed, all over the place. Guess that's the
beauty of an am detector!

http://www.advancedreceiver.com/capture/KFI081003.jpg

Jay Rusgrove, W1VD

Les Rayburn wrote:

> I notice that many other captures of KFI from Lowfer List members show a lot
> of
> frequency drift over time from carriers on 640khz. (Though KFI's signal
> with it's unique "square wave" pattern still stands out from the crowd)
>
> I'm still puzzled by the frequency drift observed however. My own captures
> of
> this channel reveal very little drift at all from these stations, though I'm
> looking at them
> in 20 Second mode.
>
> It also appears that some on the list are using less than optimum receivers
> for this
> type of work. My Icom 746 is equipped with the high stability oscillator and
> is
> never turned off.
>
> I would assume that Clint Turner is using something equally (or likely far
> more) stable, so
> again, I'm puzzled. Can all this be explained by the additional drift
> observed by integration
> over an additional 10 seconds of time?
>
> 73,
>
> Les Rayburn, N1LF
>
> Les Rayburn, director
> High Noon Film
> 100 Centerview Drive
> Suite 111
> Birmingham, AL 35216
> (205) 824-8930
> (205) 824-8960 FAX
> (205) 253-4867 CELL
> http://www.highnoonfilm.com
>
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