[Lowfer] KFI Captures and stability of AM Stations

[Stewart Nelson]

> I DID notice that, at least in my captures, that the drifting carriers 
> don't all move in the same direction (up or down in frequency) at the same 
> time ... some may be moving up as some are moving down.  Discounting KFI, 
> of course.
> 
> Would this point to drifting at the source more than the receiver?

Well, not necessarily.  If there were some carriers near 638 kHz, they
would appear to move up as your oscillator drifted up, while the carriers
near 640 kHz would appear to move down as your oscillator drifted up.
A "real" SSB receiver would, of course, greatly attenuate 638 kHz.

However, your capture shows some stable signals, and it is very unlikely
that the source drift just happened to match that of your receiver.
So I believe that your oscillator is pretty stable.  Besides, the warranty
has expired :)

Clint's capture shows many extremely stable signals, some KFI intermod
artifacts (synchronous with KFI but 3 times the swing), one sawtooth
cycler, and one wanderer.  This is consistent with other captures,
showing that a small but significant percentage of stations have carriers
that vary by a hertz or two.

Les's captures are all within a 5 minute interval, so they are just
slightly different views of the same capture.  It is not surprising that
there were no other strong drifters visible.

73,

Stewart KK7KA