[HomeBrew] RE: Homebrew Equiv. of Ameritron ALS-500M?

[Hsu, Aaron (NBC Universal)]

Just so there's no confusion...

The ALS-500M and ALS-600 are not "equivalent" amplifiers.  Yes, they are
both 500W amps, but they have completely diferent designs.  The ALS-500M
uses 12-volt Toshiba 2SC2879 bi-polar transistors and the ALS-600 uses
48-volt Motorola MRF150 MOSFETs (hence the voltage differences).

I missed the original question, but DIY designs are out there...search
Google.  Many power transistor spec sheets include a "reference" design
that can be used - in fact, many commercial products (not just amps) use
"reference" designs.

73,

  - Aaron Hsu, NN6O

-----Original Message-----
From: homebrew-bounces at mailman.qth.net
[mailto:homebrew-bounces at mailman.qth.net] On Behalf Of Jim Miller
Sent: Saturday, July 01, 2006 4:56 AM
To: homebrew at mailman.qth.net; DavidE Benedict
Subject: Re: [HomeBrew] Homebrew Equiv. of Ameritron ALS-500M?


** Please do NOT cross-post messages when posting to HOMEBREW **

The Ameritron ALS-500M does use 13.6 instead of the 50v as used by the
equivalent ALS-600.  It ALS-600 has a 50 volt powers supply that comes
with it.

4 batteries gives 50v but takes up some space (under hood - not in
today's cars, floor in back seat - dangerous for hydrogen or in an
accident, trunk in bolted down battery boxes - probably O.K.).  Charging
them can be done with four little "maintenance" chargers fed by a single
inverter in your car (unless you are planning on HOURS of continuous
operation).  This will run your battery down if you are not driving
while the amp batteries are charging, turn off the inverter when you
drive into the garage

Use 12v power transistors instead of the 50 volt ones, probably more
expensive but lacking the problems.  The ALS500M puts out 500-600 watts,
or just find a ALS500M (with a guarantee) at a hamfest or on ebay.  It
is an excellent amp.  I use it for my main amp in the shack, heavy wires
to 2 batteries in boat battery boxes which also serve as battery backup
for my station then backed up by generators.

73, Jim

----- Original Message ----- 
From: "DavidE Benedict" <iam at pmug.org>
To: <homebrew at mailman.qth.net>
Sent: Friday, June 30, 2006 5:25 PM
Subject: [HomeBrew] Homebrew Equiv. of Ameritron ALS-500M?


** Please do NOT cross-post messages when posting to HOMEBREW **


I would like to ask everyone's help in deciding about homebrew amps for
mobile.

I think the HomeBrew mobile amp in June 2006 QST page 39, etc., would be
great if I could get my auto 13.6 batteries up to the necessary 50 volts
for this amp.

I guess Ameritron uses a supply voltage of 13.6 for their 500 watt
mobile amps, though.

Is there any homebrew/DIY equivalent offered of the Ameritron ALS-500M?

Any ideas?


David B.
W7DBH
Mobile-Only ...in NW Oregon

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