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@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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