[Amps] CB etc Amps

[d.cutter at ntlworld.com]

Also mobile antennas are usually much narrower in bandwidth which helps.

David
G3UNA

> 
> From: "Tom Rauch" <w8ji at contesting.com>
> Date: 2007/10/10 Wed PM 09:40:19 BST
> To: <amps at 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 
> 
> 
> _______________________________________________
> Amps mailing list
> Amps at contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
> 

-----------------------------------------
Email sent from www.virginmedia.com/email
Virus-checked using McAfee(R) Software and scanned for spam