[Milsurplus] Calling Smart People: Class D Transmitter

[don davis]

I think the key hurdle is to get the gate to switch ON/OFF fast enough that
there is minimal operation in linear region.  This is a basic resonant mode
switching power converter.  We designed lots of similar types for space - f
was usually limited to ~ 2 MHz to keep efficiency high and problems low.
But, I'm certain can work on 40M with right FET and driver.

73 de don ad6pb 

-----Original Message-----
From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of
David Stinson
Sent: Saturday, January 31, 2015 2:49 PM
To: milsurplus at mailman.qth.net; boatanchors at mailman.qth.net
Subject: [Milsurplus] Calling Smart People: Class D Transmitter

Yes, this is boatanchor related.  I promise.

Hello Smarter-Than-Me-People:
Take a look at this Class D 630 Meter transmitter:

http://njdtechnologies.net/wp-content/uploads/2014/08/Schematic-for-25-watt.
jpg

If I scale all the parts at RF in the Drain circuit by matching reactances
(assuming IR factors are not material), can I make this transmitter work on
40 Meters?

Thanks,
Dave S.

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