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@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@hs.utc.com>
To: "Amps (E-mail)" <amps@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
>
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
>
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|