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Charlie,
I agree with you it seems improbable that the Wobblers heard on a variety of broadcast channels are jammers.
As for your hypothesis, I must admit I don't have the technical expertise to understand the relationship between satellite downloads and broadcast station signals.
If the Wobbler could be shown to be a modulation artifact, then I could see -- though not really understand the specifics -- that various signals found around a broadcast installation could infiltrate and adversely affect the transmitted signal audio.
However, because of the characteristic of the Wobbler to be highlighted by using a heterodyne technique, it seems more likely it is the carrier of the signal that is fluctuating. If the Wobbler were modulation related, it doesn't seem introducing a heterodyne by using SSB and de-tuning from the carrier frequency would create the varying beat signal that it does, which is the nature of the Wobbler.
A third possibility occurs to me; that you are suggesting a completely separate carrier is generated as a result of the satellite signal instabilities and somehow broadcast along with the normal signal. The heterodyne then produced by tuning tricks, is on that superfluous carrier. Again, my limited knowledge of broadcast systems prevents me from evaluating that possibility, although off hand it seems unlikely.
There is a good chance I completely misunderstand your point, so patience and further explanation would be much appreciated.
No matter what, thanks for adding more pieces to the thought puzzle that is the Wobbler.
-------Original Message-------
Date: 06/01/05 15:06:46
Subject: Re: [IRCA] [NRC-AM] Wobbler Xtreme on 910
Curt,
I keep turning over scenarios in my mind to explain the Wobbler. Don't
think it's a jammer because it's poor way to go about jamming, without 5
paragraphs and a sentence to define a jammer and the best method(s) of
jamming.
Think it's more likely a spur. That's been postulated before. Reason is
it appears also to be positioned to jam (unintentionally) co-channel Cubans.
And it's not likely radiated by the co-channel Cuban.
I'm thinking some sort of artifact of a part of a downlink of a
satellite signal. One in which a satellite receiver receives the beacon
signal and heterodynes it down and
generates an unwanted 910 or 930 kHz product in the frequency conversion
process. Even though the satellite beacon is stable at microwave
frequencies, it still has minor phase/frequency instabilities that if
measured directly look like fairly large excursions but which are still
minor as a PERCENTAGE of the beacon frequency but large as a percentage
of the artifact product. Instabilities of the satellite axis factored
into doppler shift. The satellite wobbles to some extent. Or the
radiating antenna shakes. Or something.
Are any brains really into gear in trying to analyze this Wobbler?
Does anyone have any experiences that could explain it?
Castro's Fairy Godfather isn't doing it.
Charlie
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Charles A & Leonor L Taylor
Greenville, North Carolina
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