Signal on 28.635 MHz

[Bill Fuqua]

By the way. When the 20 meter band is dead I frequently check 14.318 MHz to 
see if I can hear the computers in the neighborhood. This way I know that 
it is not a receive problem. These signals are clean carriers with out 
modulation. What can give them the appearance of modulation is that there 
are a number of them.  If you put your computer microphone near the speaker 
of your SSB receiver you can run ARGO (FFT) and see how many signals there 
are. And rotate the beam antenna and see some increase and decrease.  If a 
signal seems to be extremely directional it is usually very near by (not in 
the far field). From my QTH I can see maybe 50 to a 100 signals due to the 
apartments a block away. ARGO is used for weak signal detection and can 
detect signals much too weak to hear. By the way this (acoustic coupling) 
method work well for receiving PSK31 too and other signals. You don't need 
a complicated interface with transformers, over voltage protection and such 
just for receive.

73
Bill wa4lav


At 06:01 PM 1/4/2005 +1100, Brian Goldsmith wrote:


>-----Original Message-----
>From: Bill L. Fuqua
>
>
>14.318 MHz is a common I/O clock in many computers. Just tune in on 20
>meters when the band is dead and you will hear lots of computers. I suspect
>it is a second harmonic of this signal.
>
>
>*** By George,he's got it!!!!!!! Exactly as experienced downunder!.
>
>Brian Goldsmith.

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