Re: [IRCA] The Wobbler

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

Bill,

As far as all reports I've seen and my own ongoing investigation of 
the Wobbler phenomenon, they originate only from Cuban AM broadcast 
stations.  There is certainly the possibility they could occur 
elsewhere under similar conditions, but no US, Canadian, or Mexican 
stations have been heard to produce Wobblers.

Wobblers are often heard interfering to some degree with other 
stations.  It is the interaction of the varying carrier of the 
Wobbler and other carriers that produce the most audible result.  Of 
course a very strong local station will likely not be affected so 
much as weaker stations.

Wobblers originate on many different Cuban AMs, up and down the 
dial.  A list is given on the web site along with a log of recent 
receptions I've made.  Most of these are weak and unlikely to be 
heard at any great distance beyond Florida or possibly immediately 
adjacent Gulf and Atlantic states.  The occasional extremely strong 
ones -- like 1100 Radio Cadena Habana of late -- have been heard all 
the way to the northwest coast and once even in Hawaii.

You can read all about the Wobbler, with audio clips and spectrum 
images, at the web site -- link in my signature.

For a quick listen here is a direct link to a 27kB audio clip:
http://ScooterHound.com/WWWR/wobbler/wobbler7-5.mp3
Note: To best evaluate this recording you'll want to use the Windows 
audio mixer controls -- or your equivalent -- to play the left and 
right channels independently.  The Left channel is the processed 
signal, the Right channel is the signal as received.

To enhance the ability to detect weak Wobblers I use USB and off-tune 
to produce a beat note, this elevates the pitch of the Wobbler making 
it much easier to hear.  That is the difference between the left and 
right channels in this recording.  The right channel is what you 
would hear just tuning along the AM dial, if a strong Wobbler were 
encountered.  The left channel was produced using special tuning 
techniques to make the Wobbler more obvious.

Curt
-------
W. Curt Deegan
Boca Raton, (southeast) Florida, USA
http://ScooterHound.com/WWWR/wobbler


At 01:07 AM 2/21/2007, you wrote:
>  Are any wobblers being heard from any other locations
>other than Cuba? Unfortunately most US Stations are
>probably not using original equipment that's old
>enough to cause wobbling signals.I'm not detecting
>anything that sounds like a wobbler on any freq.In
>order to hear a wobbler there can't be other signals
>coming in to make the effect sound like a normal
>signal mix,correct? I'm assuming that a wobbler is
>just from one source. I can't say that I've heard one
>yet so if one of the wobbler guys in the southeast
>could attach the sound of a recorded wobbler then the
>rest of us too far away can also find out what it
>sounds like.Thanx from Bill in Vic,BC----jwkral@yahoo,ca


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