[Amps] 4CX250 bases (David Kirkby)

PA3DUV pa3duv at planet.nl
Sat Jul 23 18:02:07 EDT 2005


The same in my mobile HF system.
When the Henry SS750 kicks in on 40 meters at 1.1 KW, the aircon fan starts 
to increase speed.
Cheers, Dick
PA3DUV


----- Original Message ----- 
From: "kenw2dtc" <kenw2dtc at comcast.net>
To: "Bill Fuqua" <wlfuqu00 at uky.edu>
Cc: <amps at contesting.com>
Sent: Friday, July 22, 2005 11:03 PM
Subject: Re: [Amps] 4CX250 bases (David Kirkby)


>
> WA4LAV asked:  "I have often wondered if strong RF fields ever mess up the
> brushless motor's internal controllers?"
>
> Yes they do.  I had a friend who ran a 4000 watt CB transmitter in his 
> van.
> (two 270 amp Leese Neville alternators with a variable field that would
> allow the voltage to hit around 21 volts).
> When he keyed the mike, the six cooling fans would vary, some at half 
> speed,
> some slower, some completely stopped.  He never figured out if the RF was
> radiated from antenna to the fans or if there was RF on the common DC 
> feed.
> (There was virtually no voltage drop because of the huge welding cable 
> size
> feeds).
>
> The first time he visited my house, he got into everything, all audio
> equipment, telephones and TV sets.  With the power mike turned all the way
> up and the non-linear amp, he was basically an RF SQUARE WAVE on wheels. 
> I
> always thanked him for not being on the amateur radio bands.
>
> 73,
> Ken W2DTC
>
>
>
>
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps 



More information about the Amps mailing list