[Amps] Solid State HF High power linear amps

[R.Measures]

On Mar 31, 2005, at 4:51 PM, Gary Smith wrote:

> Do a few on this forum recall when "solid state" was transistorized 
> mobile power supply, a great leap forward from dynamotors?
>  
> I'll let others explain to the younger subscribers of this forum what 
> a "dynamotor" was if they don't know.
>  
> I remember seeing pictures of the radios that used them being 
> installed in the trunk of `48 Fords and Chevy's with Leece-Nevell (6 
> v) alternators doing the REALLY heavy lifting, current wise.
>  
Circa 1956, I saw a Leece-Neville 6v, 100a 3Ø system with step-up 
transformers to give 115/200 vac 3Ø.  There was little room left in the 
engine compartment.

> No, I do not want to go back to the good old days, period. 
> 73,
> Gary... wa6fgi
>  
> ps: I did see an engine cough and die under (too much) load at idle 
> when a 80 watt Motorola low band radio was keyed up on a restored 1948 
> Ford patrol car. (I had the job of retuning the radio, nobody else had 
> a Motorola test set. They had all been tossed out in the junk piles. 
> gms)
>  
> ----- Original Message -----
>  From: Steven Grant, W4IIV
> To: Richard Measures ; Steve Thompson
> Cc: amps at contesting.com
> Sent: Thursday, March 31, 2005 3:59 PM
> Subject: Re: [Amps] Solid State HF High power linear amps
>
> Be happy they no longer use 6 volt systems.  a solid state amp for 
> that would be a nightmare
>
> Richard Measures <r at somis.org> wrote:
> On Mar 28, 2005, at 11:14 PM, Steve Thompson wrote:
>
> > Dr. William J. Schmidt, II wrote:
> >> I personally have gravitated towards 2SC2879's, MRF120's, and
> >> MRF455's for the car... the 2SC2879's are 14 VDC devices and are
> >> super dirt cheap in quantity.... even from a high-buck place like RF
> >> Parts.
> >>
> >> A buddy of mine, K0UM is in the process of building a 48 VDC MRF150
> >> amp for his car... using a voltage quadrupler of a simple design 
> (now
> >> I say simple, knowing full well he owns a power supply design
> >> company). The higher voltage devices have better efficiency.
> >
> > It's probably not long until 36V car electrics become commonplace.
>
> BMW is reportedly going to 42Volts. This makes much sense for starting
>  diesel engines and QRO mobiles.
> >
> > Steve
> > _______________________________________________
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> >
> >
>
>
>
> Rich Measures, 805.386.3734, AG6K, www.somis.org
>
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>
>
> STEVEN GRANT    W4IIV
>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org