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All:<br>
<br>
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.<br>
<br>
I know that 50 volts is a nice value and relatively easy to obtain
power supplies. <br>
<br>
So, here's the question: Could these devices be operated at 75 or
90 volts, and what would be the impact?<br>
Would efficiency go up? (Suspect yes)<br>
Would current drain go down? (probably)<br>
<i>Would IMD be further improved, like the move from 12 to 50
volts????</i><br>
<br>
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.<br>
<br>
73,<br>
Jim<br>
<a class="moz-txt-link-abbreviated" href="mailto:wb4gcs@amsat.org">wb4gcs@amsat.org</a><br>
<br>
PS: Ulrich, nice to see your post. I have <b><u><i>thoroughly</i></u></b>
enjoyed every one of your books that I've read.<br>
Jim<br>
<br>
<br>
<div class="moz-cite-prefix">On 9/24/2012 7:20 PM, <a class="moz-txt-link-abbreviated" href="mailto:KA2WEU@aol.com">KA2WEU@aol.com</a>
wrote:<br>
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<blockquote cite="mid:19d89.5a614d40.3d9244bb@aol.com" type="cite">
<pre wrap="">***** High Performance Software Defined Radio Discussion List *****
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<div>This new book has a special chapter on FET amplifiers.</div>
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<div>Ulrich</div>
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<div><a moz-do-not-send="true"
href="http://www.wiley.com/WileyCDA/WileyTitle/productCd-0470901810.html">http://www.wiley.com/WileyCDA/WileyTitle/productCd-0470901810.html</a></div>
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<div>In a message dated 9/24/12 4:37:39 P.M. Eastern Daylight
Time, <a class="moz-txt-link-abbreviated" href="mailto:dc6ny@gmx.de">dc6ny@gmx.de</a> writes:</div>
<blockquote style="BORDER-LEFT: blue 2px solid; PADDING-LEFT:
5px; MARGIN-LEFT: 5px"><font style="BACKGROUND-COLOR:
transparent" color="#000000" size="2" face="Arial">*****
High Performance Software Defined Radio Discussion List
*****<br>
<br>
Hi Georg,<br>
<br>
there is no significant difference designing bipolar or
FET pushpull power<br>
amps, except biasing. Use the wellknown Motorola AN593,
AN749, AN758, AN860,<br>
AR305, AR313 and also the Philips Notes ECO6907, ECO7213,
NCO8701 and<br>
NCO8703 are very helpful. All is available in the
internet.<br>
<br>
73, Helmut, DC6NY<br>
<br>
-----Ursprüngliche Nachricht-----<br>
Von: <a class="moz-txt-link-abbreviated" href="mailto:hpsdr-bounces@lists.openhpsdr.org">hpsdr-bounces@lists.openhpsdr.org</a><br>
[<a class="moz-txt-link-freetext" href="mailto:hpsdr-bounces@lists.openhpsdr.org">mailto:hpsdr-bounces@lists.openhpsdr.org</a>] Im Auftrag von
Georg Prinz<br>
Gesendet: Montag, 24. September 2012 20:08<br>
An: <a class="moz-txt-link-abbreviated" href="mailto:hpsdr@lists.openhpsdr.org">hpsdr@lists.openhpsdr.org</a><br>
Betreff: [hpsdr] book RF design recommendation<br>
<br>
***** High Performance Software Defined Radio Discussion
List *****<br>
<br>
Hello,<br>
<br>
could anybody recommend me a good engineering book about
practical<br>
design of broadband RF MOSFET push pull amplifiers?<br>
<br>
73, Georg, dl2kp<br>
<br>
<br>
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