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Re: [Amps] Transistor amps

To: <craxd1@ezwv.com>, <amps@contesting.com>
Subject: Re: [Amps] Transistor amps
From: "Dr. William J. Schmidt, II" <bill@wjschmidt.com>
Reply-to: "Dr. William J. Schmidt, II" <bill@wjschmidt.com>
Date: Tue, 29 Mar 2005 01:07:33 -0600
List-post: <mailto:amps@contesting.com>
Check these out... I just uploaded them to my website.  They make fine CW 
amps... need a little work for SSB... but not much!

http://www.wjschmidt.com/ham/apt9502.pdf

http://www.wjschmidt.com/ham/apt9701.pdf

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@ezwv.com>
To: <amps@contesting.com>
Sent: Monday, March 28, 2005 8:54 PM
Subject: Re: [Amps] Transistor amps


> William,
>
> If things convert over to solid state, that is what's needed, a high
> voltage semiconductor. This I am interested in and wouldn't mind building
> a prototype. One thing about mosfets I was told is you can parallel them.
> You can parallel say 4 on each side of a push pull amp (8 total) to
> increase it's power. This way, you dont have to worry about all those
> splitters and combiners.
>
> Thanks,
>
> Will
>
> *********** REPLY SEPARATOR  ***********
>
>>On 3/28/05 at 7:38 PM Dr. William J. Schmidt, II wrote:
>>
>>>Frequency response rolls off too much for those transistors.  They were
>>>made
>>>to work below 2 mhz.  HOWEVER, there are the high voltage mosfets from
>>>Advanced Power Technology that work in the 300-1,200 VDC range deserve
>>>discussion.  The devices are targeted for RF designs  < 75 Mhz, and are
>>>very
>>>cheap by most measures (not Rich).  Lots of class "E" circuits for
>>them...
>>>APT has many app notes on them... check them out!
>>>
>>>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@ezwv.com>
>>>To: <amps@contesting.com>
>>>Sent: Monday, March 28, 2005 7:08 PM
>>>Subject: [Amps] Transistor amps
>>>
>>>
>>>> This is something I have thought of for years and never looked into it.
>>>> Could an amp be built using horizontal output transistors where the
>>>> voltage can be ran up to keep the current down? I wonder if any would
>>>work
>>>> up in this frequency range (2-30 MHz)?
>>>>
>>>> Will
>>>>
>>>> _______________________________________________
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>>>>
>>>
>>>
>>>_______________________________________________
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>>
>>
>
> *********** END FORWARDED MESSAGE  ***********
>
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