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Re: LF: RE: pictures of my new 136kHz stn

To: [email protected]
Subject: Re: LF: RE: pictures of my new 136kHz stn
From: [email protected]
Date: Mon, 1 May 2006 03:36:03 EDT
Delivered-to: [email protected]
Reply-to: [email protected]
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In a message dated 30/04/2006 21:43:09 GMT Standard Time, [email protected] writes:
Hi Dick, LF Group,
What power supply voltage will you be using for your new TX, and what RF power do you hope to get out with 4 times IRFP450?
73, Dave G3WCB IO91RM
Hi Dave / Dick.
If it helps:  I converted on of my 250W linear amplifiers which used 4 IRFP450s to class D(ish)  The power output went to 700W on 136kHz.  I just replaced the input phase splitting transformer with the normal class D 4426 driver chip.  
I also used the same amp in Scotland at 300W on 73kHz to work Jim M0BMU and Derek G3GRO who were nr Lands End. PSU was adjustable 35 to 48V.
David  G0MRF
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