[hpsdr] book RF design recommendation

[Jim Sanford]

All:

I have been perusing the data sheets on the various 600W and 1200W 
devices people are now using at 50 volts.  I note that many of them have 
a Vdd max of 100 volts or so.

I know that 50 volts is a nice value and relatively easy to obtain power 
supplies.

So, here's the question:  Could these devices be operated at 75 or 90 
volts, and what would be the impact?
     Would efficiency go up?  (Suspect yes)
     Would current drain go down?  (probably)
/Would IMD be further improved, like the move from 12 to 50 volts????/

Or is it like the AM days where you had to operate a device at half it's 
rating to allow for doubling by the modulation envelope?  I suspect not, 
given today's SSB and digital modes, but would be very interested in 
what the brilliant people on this list think.

73,
Jim
wb4gcs at amsat.org

PS:  Ulrich, nice to see your post.  I have *_/thoroughly/_* enjoyed 
every one of your books that I've read.
Jim


On 9/24/2012 7:20 PM, KA2WEU at aol.com wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> This new book has a special chapter on FET amplifiers.
> Ulrich
> http://www.wiley.com/WileyCDA/WileyTitle/productCd-0470901810.html
> In a message dated 9/24/12 4:37:39 P.M. Eastern Daylight Time, 
> dc6ny at gmx.de writes:
>
>     ***** High Performance Software Defined Radio Discussion List *****
>
>     Hi Georg,
>
>     there is no significant difference designing bipolar or FET
>     pushpull power
>     amps, except biasing. Use the wellknown Motorola AN593, AN749,
>     AN758, AN860,
>     AR305, AR313 and also the Philips Notes ECO6907, ECO7213, NCO8701 and
>     NCO8703 are very helpful. All is available in the internet.
>
>     73, Helmut, DC6NY
>
>     -----Ursprüngliche Nachricht-----
>     Von: hpsdr-bounces at lists.openhpsdr.org
>     [mailto:hpsdr-bounces at lists.openhpsdr.org] Im Auftrag von Georg Prinz
>     Gesendet: Montag, 24. September 2012 20:08
>     An: hpsdr at lists.openhpsdr.org
>     Betreff: [hpsdr] book RF design recommendation
>
>     ***** High Performance Software Defined Radio Discussion List *****
>
>     Hello,
>
>     could anybody recommend me a good engineering book about practical
>     design of broadband RF MOSFET push pull amplifiers?
>
>     73, Georg, dl2kp
>
>
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