[hpsdr] Thor

[FRANCIS CARCIA]

Hi,
I just wanted to add a FET pair like the MRF150 running at 30 volts easily makes 100 watts. When you derate the voltage like the mil people do the fet will really take a beating and not get hurt. Harris runs 28 volts on their MRF150s.  One could run up to class A and still make 100 watts. Check the motorola specs in the fine print giving -50 dB IMD3. 
frank wa1gfz
--- On Fri, 4/17/09, Jeroen Bastemeijer <j.bastemeijer at tudelft.nl> wrote:

From: Jeroen Bastemeijer <j.bastemeijer at tudelft.nl>
Subject: Re: Thor
To: "Phil Harman" <phil at pharman.org>, carcia at sbcglobal.net, "HPSDR discussion list" <hpsdr at hpsdr.org>
Date: Friday, April 17, 2009, 3:48 AM

Hi Phil and Frank,

Phil, thank you for the confirmation. Frank, I think (hope) that your mail to
the HPSDR list was triggered by the short discussion about the power supply for
Thor.
Quote from Franks e-mail: "48 volts with a 1:2 output transformer will
yield about 300 watts"

Can I "convert" that to a 150 Watts PA at 48V without a transformer?
Or is the transformer essential for impedance matching? What would be the
maximum operating frequency with and without the output transformer?

In short: Based on your experience would a 100 Watt PA working from 160m to
10m, powered from 48Volts be feasible? Or would it even be doable from 24Volts?

Looking forward to your answer,

73 Jeroen PE1RGE

Phil Harman wrote:
> Hi Jeroen,
> 
> 
>> Can I make the assumption that when Demeter gives a voltage of 48Volts
Thor is able to produce (approximately) 100Watts of output power? This
combination (HPSDR, Thor and Demeter) would make a nice mobile station, with a
very high energy efficiency!
>> 
> That would be fine.
> 
> 73's Phil...VK6APH 
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