There is very little tissue heating at HF.

As you start passing through Vhf to UHF you have severe issues. Some very
serious tissue effects can happen at 432. My 432 amp can generate 2KW out.
With big antennas at those frequencies ERP's in the mega watt range are
possible at ham power levels.

The original microwave ovens ran around 900MHz well there's another ham band
too.

You have more problems stopping pacemakers at HF. I wonder if there could
be any liability at a stop sign if the person in the car next to you keeled
over because you were trying to work the 7Alpha on 20 meters from the car?

At the old WB0DRL VHF/UHF contest station they tuned the amps with microwave
leakage detectors, you know the tool for testing ovens. All the stations
had them. The shack was RF tight, however when the door was opened the
detectors would all start banging off the pegs to the CW. Everybody would
scream "Shut that door"

I declare Ham Radio is completely safe. What? (Battle Cry heard from the LT
as you charge the enemy with only a knife in your teeth) YOU WANT TO LIVE
FOREVER?

BOB DD

-----Original Message-----
From: ham_amplifiers@yahoogroups.com [mailto:ham_amplifiers@yahoogroups.com]
On Behalf Of badgerscreek
Sent: Wednesday, January 10, 2007 5:34 AM
To: ham_amplifiers@yahoogroups.com
Subject: [ham_amplifiers] Re:hi power mobile

I think those Yellow Top Batteries are called Optima Batteries?

I dont know why nobody is concerned about having their brains so
close to the antenna? I mean sitting in the near field of the antenna
running 1 or more kilowatts at the higher frequencies would have me
worried. Maybe the adrenalin rush is more potent than worrying about
your health, or maybe theres no danger?

Greg

--- In ham_amplifiers@yahoogroups.com, "craxd" wrote:
>
> --- In ham_amplifiers@yahoogroups.com, "pentalab" >
> wrote:
> >
> > --- In ham_amplifiers@yahoogroups.com, 1800 Toll Free
> > > wrote:
> > >
> > > It's kind of funny watching the thread about the mobile
> amplifiers
> > and
> > > voltage requirements.
> >
> > ##### I have zero experience with it. I was just waiting for
> you
> > to come out of the wood work.... since I knew you guys had this
> down
> > pat.. and was all old news. The deep cycle communications
> > batteries work pretty good.
>
>
> Right now, they're running those yellow top batteries with the spiral
> cells. They claim these to be the best. Also, there's really no limit
> to the batteries that you parallel together to get the power required
> you need. The more batteries, the longer you can run. I've seen the
> big 24V batteries used in diesel rigs too ran in these set ups. The
> ones you want have the largest amp-hour ratings.
>
>
> >
> > ### I also read in an old QST... where they would use 2 x
> > batteries in series.... like those used in golf carts..... but one
> > was 6 V... and the other was 8 V. [didn't even know u could get
> > deep cycle batteries... big ones... in 6 + 8 V ] Then ur car
> > regulator would charge em to 14 .3 V..... then with engine OFF....
> > ur small 706-mk-2-G would last way longer. That setup was also
> > used in some Field day event's.
> >
> >
> >
> >
> > > They use a charging system consisting of a 24 volt alternator,
> and
> > run
> > > parallel / series combos of standard car batteries (or standard
> > and deep
> > > cycle, if they are smart) to have a 24 volt electric system.
> One
> > > alternator, and a pair of batteries will power quite a large
> > system, as
> >
> > ### Don't some of em use train alternator's ??? Think they
> > were split stator, dual rotor.... or split rotor, dual stator...
> > made by Neville Leece.... at 1000 A per stator ?? Or was this
> > for the tube setups ??
>
>
> They'll use like 6 of the Leece Neville alternators under the hood to
> power the big solid state amps. Some have used generators that can
> provide 115/230 Vac too ran off the belt.
>
>
> >
> > ### I still haven't seen any detailed website on this hi power
> > mobile stuff. Trying to generate the power is a huge project in
> > itself. RFI, etc... Rf decks... is another issue. You are
> > right... hams are just trying to reinvent the wheel.
>
>
> Right, not a lot has been published on this as it was all done sort
> of under the table away from the FCC.
>
>
> >
> > Later... Jim VE7RF
> >
> >
> > > --Toll_Free
> > >
> >
>
>
> Best,
>
> Will
>

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