[Amps] Big Solid State Power Amplifiers

[R.Measures]

>no rich..not ok for SSB nor for shortwave...something to do with switching 
>speeds. i assume when i say not linear, i also mean not good for SSB
> 
**  So why would a Ham want a not-linear amplifier?

>also a question not related to this thread......what would be the issue of 
>running 3,800 volts on a pair of 3-500Zs?  im rebuilding an SB-220 and may 
>do an outboard power supply...thanks......steven  W4IIV

**  The bandswitch in a SB-220 is not very ok with a 3800vdc anode 
supply.  3000v is close to the limit for a SB-220.  If one needs more 
output it takes at least 4x as much suds to make a noticable difference.  
The difference between a SB-220 and a tetrode with handles is only c. 1.7 
S-units.  

>"R. Measures" <r at somis.org> wrote:
>** Not linear is OK for SSB? The difference in S-units between an 
>amplifier that 60% efficient and an amplifier that is 90% efficient - for 
>the same power input - is 0.3 S-units, or 1.76db.
>
>>http://hawkins.pair.com/wabcnow.shtml should give you a heads up on the 
>>operation of these broadcasting beasts.
>>they are totally digital, and uses square waves for RF genoration...they 
>>are not linear..but they are 90% efficient......steven, W4IIV
>>
>>"R.Measures" wrote:
>>
>>
>>>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 at wjschmidt.com
>>>Alternate Email: wmschmidt at charter.net
>>>WebPage: www.wjschmidt.com
>>>
>>>
>>>
>>>----- Original Message ----- 
>>>From: "R.Measures" 
>>>To: ; " AMPS" 
>>>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.
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>>>
>>>
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>>
>>STEVEN GRANT W4IIV
>>
>>
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>
>STEVEN GRANT    W4IIV
>
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