Back in the 80's and early 90's, I ran a KW mobile SSB, and never had any
negative issues. I used the Hustler Super Resonators (still made and in use by
many today), and they are rated at 1KW. I can't remember what automobiles I
installed it in, but I remember using a much larger battery, and a larger
alternator. Was not a good idea to use it with the car not running!!!!
In fact, I still have the amp in the closet; it is a Magnus MA1000B, ran on 12V
(with the car running, 13.4 or so) and used eight, 31003OD Power Transistors.
Requires about 60 Watts, for 1000W input.
Dick, K8ZTT
From: Ron D'Eau Claire <[email protected]>
To: 'Mike Smith VE9AA' <[email protected]>
Cc: [email protected]
Sent: Friday, April 14, 2017 11:28 AM
Subject: Re: [Elecraft] KPA500 mobile?
One issue with mobile QRO is the antenna. While a mobile whip/loading coil
combo can be designed for high power, it becomes difficult to prevent corona
discharge from the end of the whip while transmitting at high power.
One fairly common solution decades ago was to mount a copper toilet tank float
on the end of the antenna. Of course the wind resistance then required guying
the whip. Since it was typically on the rear of the car, a nylon cord from the
mid-point to somewhere forward on the roof was common.
Another approach - back when car bodies were steel - was to extend the whip to
it could be bent over and tied to the front bumper, turning the car body and
whip into a small loop antenna.
Today, it might be hard to establish the necessary distance from the antenna
while sitting in the car to meet modern RF exposure limits, especially on 20
meters and up.
I never went QRO in my car, but had buddies who tinkered with it way back when
vacuum tubes were "king". Back then I lived in the land of the "California
Kilowatt" (Southern Calif.). They mounted outboard generators on their car
engines to handle the power demand. Adding filaments, etc., a kW mobile station
might require 1.5 or 2 kW of d.c. power to run it. Got a chuckle out of them
when they'd key the mic to transmit while sitting at a stop light with the
engine at idle, and the sudden added power demand caused the engine to stall.
73, Ron AC7AC
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