In a mobile environment you will find yourself sooner or later transmitting
into an mismatched load.
You'd better have a close look at the protection features and the amount of
overrating of any amp you consider to purchase. My experience with the SG500
over 400 000 mobile miles is that it is indestructible and very reliable so
far.
Besides the extensive safety features the SG500 has all the other options
you will need in a mobile application.
Trick of the trade for a high performance mobile station is a efficient
antenna and a beefy power supply for the amp. I use a100 Ah Exide gell cell
battery adjacent to the amplifier and the HiQ 4/80 centerloaded vertical.
Remote and/or automatic bandswitching, remote control, low power drive (50
watts for 500 watt out) etc. I've bought the amp second hand from a US ham.
For more info see http://www.qsl.net/pa3duv and http://www.hiqantennas.com
Regards, Dick P3DUV
----- Original Message -----
From: "Gene Bigham" <jbigham2@kc.rr.com>
To: <Amps@contesting.com>
Sent: Tuesday, October 14, 2003 6:09 PM
Subject: [Amps] Henry 750?
One list member asked about a solid state amp, another said get a Henry. I
too am interested in a solid state amp, am working on building one and have
looked at SGC, Ameritron/Vectronics (aka MFJ), there seems to be an Italian
version and a Japanese version also, and the Henry. E-Ham has multiple
posts for reviews of these. It looks like a mixed bag positive and negative
for these units... Anyone on this list with real life experience with the
Henry 750 not the larger 1200 unit? It would be nice if someone developed a
lower voltage FET for mobile use? What does the Henry run 4 - 8 2sc2879's?
They are all pricey, but FCC type accepted. I am still working on my
homebrew with 4 pcs 2sc2879's perhaps this winter will see it to completion,
still need to build an output filter(s), and dynamic bias control. Plan to
put this behind my Radio Shack 10 meter rig mobile in my '03 Dakota Quad Cab
4x4 with super heavy duty electrical system. With sunspots going down I
guess I should not get too excited about a 10 meter mobile station, huh?
Maybe can trade up to an all band mobile rig.
Gene Bigham KB0GU
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