Will,
I seen you discuss adding "air variables", etc. to the output circuits of
transistor amps before... and can't quite figure out why one would do that.
I've built and converted many transistor amps in the past, and they all used
a nice set of high quality wide-band transformers... and a good gain
leveling circuit that would cost just a few dollars. Anyone that reads the
handbook or Schoneke's book ("Single Sideband Systems")... should be able to
design and build adequate transformers. If its the antenna that's causing
an SWR problem... its probably better to fix the antenna than build a pseudo
antenna match into the amp.
I see the mentioned amp lacks any harmonic filters. I *suppose* one could
argue that the antenna is the filter network in a mobile situation.
Sincerely,
Dr. William J. Schmidt, II K9HZ
Trustee of the North American QRO - Central Division Club - K9ZC
Email: bill@wjschmidt.com
WebPage: www.wjschmidt.com
"If computers get too powerful, we can organize them into a committee; that
will do them in." -- Bradley's Bromide
----- Original Message -----
From: "Will Matney" <craxd1@verizon.net>
To: <amps@contesting.com>
Sent: Sunday, July 31, 2005 8:28 AM
Subject: [Amps] Mobile Amps
> All,
>
> I ran across this solid state amp on ebay and thought it might be a good
> one to convert over to amateur service. I about bet now it's class C but a
> bias circuit can be added. It doesn't have a good RF keyer in it either.
> However, the builder did add an air variable capacitor for output tuning
> which is a step up for most. This "Pac Man" brand is a name I've never
> heard of. From the pictures though, it looks like a good candidate inside
> and that it may have enough room for a bandswitched filter board. If your
> not interested in buying it, the pics give a good idea of what they look
> like on the inside. Also, this amp uses 8 sets of push-pull amps using 16
> transistors. In other words, it's a big amp.
>
> Link;
>
> http://cgi.ebay.com/PAC-MAN-16-PILL-10-METER-AMP_W0QQitemZ5794298630QQcategoryZ48700QQrdZ1QQcmdZViewItem
>
> Best,
>
> Will
>
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>
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