[IRCA] Re: Wobbler strong on 930

[Charles A & Leonor L Taylor <calltaylor@xxxxxxx>]

N0UIHEric@xxxxxxx wrote:

> The wobbler...is that the bubble-sounding jamming? If it is, then I've 
> heard that on shortwave, jamming the signals of Radio Marti and 
> WRMI-Radio Miami International.
>  
> 73, Eric (N0UIH)


Eric,

Should have answered this earlier. The Cuban SW jammers transmit an 
unmodulated carrier whose frequency is swept back and forth across the
frequency to be jammed. The sweep rate is something like 5 Hz, is 
symmetrical and is regular and unchanging. As though a varicap diode driven
with a 5 Hz sinewave were placed in series/parallel with the transmitter 
crystal cut to the jamming channel frequency.

The Wobbler sounds the same except the sweeping stimulus sounds to be a 
random variable frequency and random variable intensity damped
sinewave.

I haven't heard any AM modulation on the MP3 clips that Curt Deegan has 
put at the_ http://ScooterHound.com/WWWR/wobbler/_. 
In order for varying powerline voltages to cause a crystal oscillator to 
wobble in frequency as the Wobbler does would probably require
such wild fluctuations as to blow the transmitter off the air. With that 
sort of instability, power coming off a power grid wouldn't be able
to keep the power generators feeding the grid in synchrony.

Weirdest dern thing!

Charlie
_
_

_-- _
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Charles A & Leonor L Taylor
Greenville, North Carolina


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