Signal on 28.635 MHz

Bill Fuqua wlfuqu00 at UKY.EDU
Tue Jan 4 10:16:55 EST 2005

It just occurred to me that you may try to track it down. It could be a 
local computer experimenter that has constructed his own card   for some 
I/O process or someone using the common 14.318 crystal in a single board 
computer with our shielding or filtering between it and the power line.

Bill wa4lav

At 02:42 PM 1/3/2005 -0800, Glen Zook wrote:
>Last night I was checking a local's SSB signal on the
>10 meter band.  After we got through I started tuning
>around the band and ran across a steady carrier
>located approximately at 28.635 MHz.  Although there
>are numerous computer "spurs" around that frequency
>this particular signal is very different from the
>"normal" computer spurs.
>First of all, there is no modulation of any type on
>the carrier, not even a trace of "hum".  There are
>computer spurs on almost the same frequency but the
>signal strength of those is such that an S-1 signal
>could be easily copied through the spurs.  The signal
>is definitely vertically polarized.  When I switch
>from a vertical antenna to my 3-element yagi at 55
>feet above ground the carrier virtually disappears in
>signal strength and the computer spurs take over the
>I have checked with "locals" and they are hearing the
>same signal again vertically polarized.  I first came
>across the signal about 11:00 PM CST last night and it
>was as close to 28.635 MHz as I could read on all 3 of
>my Collins S-Line receivers and my Collins 75A4.
>Since last night the signal has drifted up in
>frequency almost 1 KHz and is now on about 28.636 MHz.
>Since I haven't tuned around that part of the 10 meter
>band for months I have no idea as to how long the
>signal has been on the air.  But, the signal level is
>running around S-8 on receivers that have been
>calibrated for an S-9 reading of 50 microvolts.
>Because of the fact that the signal level does not
>seem to vary this source has to be local.
>I have heard from several people around the country
>that are hearing signals on 28.635 MHz.  However, all
>of those seem to be the "usual" computer "spurs" since
>they do have some sort of modulation ("buzz", etc.).
>Anyway, I haven't put my 10 meter mobile in the car
>and gone looking for the source of the signal.
>However, I am looking for suggestions as to just what
>this might be.  Frankly, over the years I have run
>into all sorts of signal sources.  But, none as
>"clean" as this particular source.
>Glen, K9STH
>Glen, K9STH
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