[Amps] Solid state amps

[Dr. William J. Schmidt, II]

Of course you realize that running the DC through the transformer is 
disadvantageous because it creates a strong "B" field in the core which can 
drastically reduce the dynamic response of the DC/RF transformer.  With an 
outboard choke, both parts can be smaller in size... and keep the RF 
transformer from saturating (reduce non-linearities and less distortion 
because of it!).

Most of us use another core as a DC choke... and AC couple the RF 
transformer... and there are better materials to use...


Sincerely,

Dr. William J. Schmidt, II  K9HZ
Trustee of the North American QRO - Central Division Club - K9ZC

Email: bill at 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: "Carcia, Francis A HS" <francis.carcia at hs.utc.com>
To: "Amps (E-mail)" <amps at contesting.com>
Sent: Thursday, March 31, 2005 3:09 PM
Subject: [Amps] Solid state amps


> Hi all,
> I've collected parts to do 9 push pull MRF150 stages and someday maybe I
> will assemble. The boards will
> be modified ENI surplus. I found ENI transformers don't work well below 7
> MHz. and the typical type 43
> sleeve doesn't work well below 3 MHz. I found it takes 2 sleeves in series
> to get minimum primary inductance
> on 160 meters. These are the .875 inch O.D. sleeves. I wonder if anyone 
> has
> also noticed this on 160 M.
> I have also seen this with CCI kits. I plan to run DC through the
> transformer because I found it forces a better
> balance with MRF429 bipolars. Frank, WA1GFZ
>
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