[Lowfer] KFI Captures and stability of AM Stations

[Bill Ashlock]

Les,

A good way to get a 'feel' of which signal/receiver is unstable is to 
compare the average slope of all visible signals on one screen. Most of the 
AM signals in a typical capture will produce a non-sloping straight line if 
the receiver is stable. If they all seem to be sloping the same way it's 
usually the receiver's drift causing it. Similarly, if a signal stands out 
as having a slope different from the rest, it can't be the receiver causing 
this.

Bill A


>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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