[Amps] Mobile high power

[HAROLD B MANDEL]

Years ago police cars had 200 watt transmitters on 29MHz. The shops would
outfit the 
vehicles with Delco-Remy 100 amp generators that barely fit under the
hood.

They needed special regulators, but at that time the regulators were
three-relay
mechanical types. When the operator keyed the mike (AM) the motor would
slow down.

The application today are CB operators who attend "shoot-outs" with very
high
power mobile amplifiers mounted in vans. We're talking idiots who run
dual
3CX5000A's with 1-5/8" hardline and 4/0AWG going to the battery bank.

It's a popular "sport" in some circles.

Hal

On Thu, 27 Oct 2005 13:17:16 -0400 "Will Matney" <craxd1 at verizon.net>
writes:
> Joe,
> 
> Lets say it takes a big, and good motor to run a big alternator, or 
> several like some does. I've seen some that used turbochargers on 
> them with up to six 200 amp alternators under the hood. Nobody needs 
> that kind of power, and especially being that close to it over RF 
> radiation.
> 
> Best,
> 
> Will
> 
> *********** REPLY SEPARATOR  ***********
> 
> On 10/27/05 at 10:12 AM Joe Isabella wrote:
> 
> >My amp has 4 '2879s and pulls 90A peak, around 50A average and puts 
> out
> >about 500W +/- depending on band.  If I can't be heard that way, 
> then it
> >ain't meant to be!!  Besides, my problem is usually hearing in the 
> noisy
> >mobile environment, not being heard.  The exception is 75m and to a 
> lesser
> >extent, 40m.  I really only use the amp down there -- on 20 & up, 
> I
> >haven't really had a need to use it yet.  Well, I did use it on 20m 
> once
> >when I was chatting with another mobile to get over his noise 
> level.
> > 
> >I can't imagine what my truck would do at 4x that power!!  It 
> already not
> >too happy with what I got!
> > 
> >:-)
> > 
> >Joe, N3JI
> >
> >
> >Philip de Cadenet <phil at transmittersrus.com> wrote:
> >Dick,
> >
> >I'd come across that site and it's listed in my favourites.
> >
> >I know there are lurkers, and some posters to this reflector who 
> indeed 
> >have high power mobile experience, far more than myself.
> >
> >Rather than 5Kw+...
> >
> >I still think it's feasible to hit the magic 1500w output off of a 
> 14v 
> >DC rail without messing with voltage doubler circuits or 3-phase 
> >transformers to run AC amplifiers.
> >
> >Despite what some may think it does not take much to design a very 
> high 
> >current 14v DC rail in a mobile suitable for running the US legal 
> limit 
> >and some. It's all down to correct charging techniques, suitable 
> battery 
> >storage and minimising loses along all the cabling.
> >
> >I have a 16 x 2SC2879 amp which I've yet to fire up in anger. One 
> day 
> >I'll install it in a mobile. Plus, the only mains power supply I 
> have 
> >(0-20v @ 200A) requires a 3-phase supply which I do not have access 
> to.
> >
> >I do however have a brand new 350A Electrodyne alternator which one 
> day 
> >will power this baby.
> >
> >I'd dearly like someone to re-invent the Metron with 16 of these 
> >devices.
> >
> >Dissipating all that heat and taming the IMD is your problem:-)
> >
> >" Son of METRON"
> >-- 
> >Philip de Cadenet G4ZOW
> >Transmitters 'R' Us
> >http://www.transmittersrus.com
> >
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> >
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Harold Mandel
Const. Supt.
Baran/Greenville
606 - 205 - 0172
hmandel at barantelecom.com