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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>>>> Amps@contesting.com
>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>
>>>
>>>
>>>_______________________________________________
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>>
>>
>
> *********** END FORWARDED MESSAGE ***********
>
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