[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [IRCA] Wobblers and a possible explanation
- Subject: Re: [IRCA] Wobblers and a possible explanation
- From: "W. Curt Deegan" <WWWR@xxxxxxxxxxxxx>
- Date: Sat, 17 Feb 2007 22:33:34 -0500
Charles,
A very interesting suggestion as to Wobbler cause.
I'm listening to an Xtreme 1100 Wobbler right now at 10:07 pm ET, Feb
17 2007 (0307Z). I have audio from WTAM Cleveland, OH, on 1100, but
a weaker carrier on 1098.01 kHz, which could account for the
Wobbler. It is generally accepted that many Cuban transmitters are
old and in ill repair. This would all certainly seem to meet your
suggested criteria.
Conditions tonight are such that audio from Radio Cadena Habana is
not being heard, though in the past it usually has been. The next
time RCH is in strong and Wobbling, I'll be better able to determine
it's carrier frequency without doubt.
Your suggestion is possibly the best proposed Wobbler cause so
far. Previously, the combination of bad power regulation and old
equipment had seemed the most likely culprits, but still with no
technical explanation of why they would cause a Wobbler. You may
have added that missing element.
Thanks,
Curt
-------
W. Curt Deegan
Boca Raton, (southeast) Florida
http://ScooterHound.com/WWWR/wobbler
At 09:25 AM 2/17/2007, you wrote:
>I see a possible causes for the Wobblers.
>
>It's common among tube-type transmitters that, when the oscillator tube
>reaches the end of its useful life (when the transconductance drops below X
>micro-mhos), the inherent feedback inside the transmitter will cause the
>transmitter to "take off" and oscillate at some frequency near the assigned
>frequency. The station will sound about normal, but the carrier frequency
>will be a few kHz off and "wobbulate," or vary with a frequency-modulated
>characteristic caused mainly by bass components of the audio modulation.
>
>If the 1100 Wobbler kicks down at its extreme frequency deviations, betcha
>it'll pop up FMing a few kHz from 1100.
>
>Jest mah opinion. Take it or leave it, sez I.
>
>Charles
>
>
> -----
>Charles A Taylor, WD4INP
>Greenville, North Carolina
_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca
Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers
For more information: http://www.ircaonline.org
To Post a message: irca@xxxxxxxxxxxxxxxx