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echo: scanners
to: DUANE VINCENT
from: CHUCK MANDUS
date: 1997-05-25 15:54:00
subject: RE: B-2 and Radio Gear

Duane,
DV>I got to thinking about the frequency in discussion.  Then I subtracted
DV>21.4 Mhz from it, and came up with a frequency in the aircraft band...
        I remember listening to the comms on 388.000 MHz that the B-2
        pilots said to the ground that they would be using 151.400 MHz
        to contact the ground at the park.  They also mentioned a
        141.400 MHz freq, but there was nothing there.
DV>Which makes me suspect that what happened is that the actual
DV>transmission was in the aircraft band, and the 150 Mhz band signal was
DV>in fact an image frequency signal instead.  Check the IF frequency of
DV>your radio in the manufacturer's specs, and listen 2X the IF both above
DV>and below the desired frequency.  If you are listening to a
DV>particularly strong signal, you should hear an image both above and
DV>below the real frequency.  Believe me, it works!  The image signal above
DV>the real frequency is stronger by far than the image signal below the
DV>real frequency.
        I've noticed that too on occasions, especally with dual
        conversion scanners like my Bearcat BC-210.
Chuck, an avid scanner nut.....
DE KA3WRW
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