Also mobile antennas are usually much narrower in bandwidth which helps.
David
G3UNA
>
> From: "Tom Rauch" <w8ji@contesting.com>
> Date: 2007/10/10 Wed PM 09:40:19 BST
> To: <amps@contesting.com>
> Subject: Re: [Amps] CB etc Amps
>
> > Often, money spent on a better feedline or the replacement
> > of an old one
> > might yield better results than trying to squeeze 700w
> > (dirty) out a 600w
> > (clean) amp.
>
> That's true with tubes and many HV FET's, but with bipolar
> transistors the distortion starts to ramp up long before
> anything close to saturation occurs.
>
> 200 watt LV bipolar transistors used on big antennas or in
> IM critical applications belong in 100 watt power amps. Now
> on a small antenna like a mobile, especially when used with
> a crummy exciter and maybe 400-500 watts output maximum as
> most tiny mobiles are, we might give up significant IM
> performance without disturbing too many people. But when we
> try to run a gallon on a good antenna with a good radio the
> degradation is severe.
>
> I'd stay far away from bipolar transistors, especially at
> high power, in a home station.
>
> 73 Tom
>
>
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