Re: [IRCA] [NRC-AM] 1610 mystery station - Invitation to #mwdx

["W. Curt Deegan" <WWWR@xxxxxxxxxxxxx>]

Bob,

As I understand it now -- after some expert tutelage -- in your 
scenario you would see just what you describe.  Indeed, that was what 
we have been seeing with the 1610 test signal.

All of the other signals I was describing were simply the result of 
the interaction of the uncommon situation of a steady test tone 
signal with the receiver BFO.  Switch everything back to AM and quit 
trying to be so clever and presto, you have a 1kHz tone on 1610.

It would seem under normal circumstances because of proximity to the 
carrier, no one would be looking so closely as to see those offset 
signals.  And of course with a normal AM signal the modulation is all 
over the place so what you hear and see does not give the impression 
of offset carriers.

What I failed to recognize -- amongst other things -- was that last 
night when I could not hear the 1kHz test tone but could detect the 
main carrier, I did not see any apparent offset carriers.  Tonight 
when the audio was strong, those signals were there.  When talk of 
1609 and 1611 began, sure enough, there they were right in front of me.

Sorry I muddied the water with my details, should have stuck to 
something I understood, like, "I heard a tone too."

Curt


At 10:00 PM 11/29/2006, you wrote:
>I was wondering myself how you zero beat on a sideband with a BFO, that
>would mean that anytime a station used a test tone the sidebands would be
>for example 2khz on each side of the carrier with a 2 khz test tone etc.
>Curt I ALWAYS fire up big sets, usually around 85 lbs.
>
>Bob Young
>Millbury, Ma


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