Phil,
The 32V series is basically a 100 watt carrier, and 400w PEP transmitter at
100% modulation. Since the legal limit is 1500w PEP, you need an amplifier that
has about 6 DB of gain, to say ~ 375 watts carrier, and ~ 1500w PEP output with
100w carrier and 400w pep input. To my knowledge, a commercial amplifier does
not fit this requirement unless you insert a 3-10 db attenuator to reduce the
32V power such that the amplifier will not be over driven. A Heath SB-220 will
do with 15-25 watts carrier drive.
Several years ago I posted a concept amplifier using a pair of 304 TL's in
parallel, grounded grid, with a pi-network output. Some rough calculations
showed 6 db of gain, and 400w in made 1600w out in class Ab2 (or was it class
B). Unfortunately I lost my notes on this concept amplifier. A G-G 4-1000
amplifier might also be a candidate to explore, especially if the B+ is not too
high (opening myself up here to the B+ %eff debate..:-))
Since 6 db is ~ 1 S-unit, maybe you are better off sticking with 100w
(400pep), and boosting your antenna a little higher free from things that might
lower antenna efficiency..
Is an amplifier with less than 10db gain worth the effort? It all depends, and
you be the judge.
regards,
Jim
JKO
----- Original Message ----
From: Phil LaMarche <[EMAIL PROTECTED]>
To: Discussion of AM Radio in the Amateur Service <[email protected]>
Sent: Sunday, April 8, 2007 8:04:25 PM
Subject: [AMRadio] Need advice!
I'm getting ready to use a Collins 75A-1 and 32V-1. What commercial
amplifier would be best to up the power and be heard. Appreciate all
comments.
Thanks
Phil
Philip LaMarche
LaMarche Enterprises, Inc.
www.instantgourmetspices.com
www.W9DVM.com
727-944-3226
800-395-7795 pin 02
FAX 727-937-8834
NASFT # 30210
W9DVM
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