Solid state will Definitely be the way to go when carbon-crystal
transistors are commonplace. Who knows?, maybe they will even have an
efficiency as high as 60%!
On Mar 29, 2005, at 6:44 AM, Bert wrote:
> Very interesting!! Solid state is the way to go.
>
> 73s Bert, VE3OBU
>
>
>
> -----Original Message-----
> From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com]
> On
> Behalf Of Dr. William J. Schmidt, II
> Sent: Tuesday, March 29, 2005 2:08 AM
> To: craxd1@ezwv.com; amps@contesting.com
> Subject: Re: [Amps] Transistor amps
>
> 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
>>>>>
>>>>> _______________________________________________
>>>>> Amps mailing list
>>>>> Amps@contesting.com
>>>>> http://lists.contesting.com/mailman/listinfo/amps
>>>>>
>>>>
>>>>
>>>> _______________________________________________
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>>>
>>>
>>
>> *********** END FORWARDED MESSAGE ***********
>>
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>
>
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>
Rich Measures, 805.386.3734, AG6K, www.somis.org
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