** I have yet to hear a Ham station on SSB who is getting 90% efficiency
from his/her linear amplifier. My SB-220 linear amplifier probably uses
c. $1.20 worth of electricity per month. Going to 90% efficiency to save
a quarter a month would not make economic sense.
Thank you, Dr Schmidt
>Well, lets look at this logically.... and for the sake of argument use a
>real example... the Harris DAX series. This box uses the digital adaptive
>(phasing) modulation circuitry. The AM wave form in the exciter is
>digitally generated and non-linear. BUT every ham on the planet knows you
>CANNOT use this form of modulation in the ham bands... so toss the exciter
>and phase correcting module out the door as step one. What's left is group
>of very linear very wide band Mosfet amps. By terminating the combiner to
>replace the modulation phaser, you now have a wonderful high performance SS
>linear to use with your favorite radio.
>
>Its been done before.
>
>Sincerely,
>
>Dr. William J. Schmidt, II K9HZ
>Trustee of the North American QRO - Central Division Club - K9ZC
>
>"Collector of Edison Wind-up Phonographs... Do you have one for me?"
>Email: bill@wjschmidt.com
>Alternate Email: wmschmidt@charter.net
>WebPage: www.wjschmidt.com
>
>
>
>----- Original Message -----
>From: "R. Measures" <r@somis.org>
>To: "Dr. William J. Schmidt, II" <bill@wjschmidt.com>; " AMPS"
><amps@contesting.com>
>Sent: Tuesday, December 16, 2003 4:21 AM
>Subject: Re: [Amps] Big Solid State Power Amplifiers
>
>
>>
>>
>> >This couldn't be farther from the truth...
>>
>> ** Dr. Schmidt. Please explain why high-efficiency BC-type designs are
>> suitable for applications where linear operation over a range of
>> frequencies is required. Tnx
>> >
>> >Sincerely,
>> >
>> >Dr. William J. Schmidt, II K9HZ
>> >Trustee of the North American QRO - Central Division Club - K9ZC
>> >
>> >"Collector of Edison Wind-up Phonographs... Do you have one for me?"
>> >Email: bill@wjschmidt.com
>> >Alternate Email: wmschmidt@charter.net
>> >WebPage: www.wjschmidt.com
>> >
>> >
>> >
>> >----- Original Message -----
>> >From: "R.Measures" <r@somis.org>
>> >To: <gw4dgu@blaenffos.org>; " AMPS" <amps@contesting.com>
>> >Sent: Monday, December 15, 2003 10:25 AM
>> >Subject: Re: [Amps] Big Solid State Power Amplifiers
>> >
>> >
>> >>
>> >>
>> >> >I don't know what designs you are familiar with, but combiner losses
>> >don't
>> >> >usually impact significantly on efficiency. That's why they are used
>in
>> >> >high-efficiency AM BC transmitters...
>> >> >
>> >> **High-efficiency BC-type designs are not suitable for applications
>where
>> >> linear operation over a range of frequencies is required.
>> >> _______________________________________________
>> >> Amps mailing list
>> >> Amps@contesting.com
>> >> http://lists.contesting.com/mailman/listinfo/amps
>> >
>> >
>
>
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