[hpsdr] Thor

[Jeroen Bastemeijer]

Hi Phil,

Thank you for the quick answer! I checked the Wiki on Thor/class 
E-amplifier.

The 48V, I opted, is a telco standard voltage, so lots of relative cheap 
components are available for this voltage range. The 140Volts is 
somewhat more problematic.... at least, not very standard.

A voltage of 48Volts sounds quite reasonable for 100Watts of output. 
Having voltages higher than 48 volts for Demeter is not very practical.

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!

People who want more power from Thor could use another dedicated power 
supply for e.g. for fixed station use. (Seems pretty easy, if it would 
be possible to use the rectified voltage of a 115V isolation transfomer).

Back to the drawing board ;-)

73 Jeroen PE1RGE

Phil Harman wrote:
> Hi Jeroen,
>
> Nice to hear from you.
>
> I did some tests with  a simple Class E PA on 160m - see the Wiki for 
> the schematic.  On a 40v supply I was able to get about 40w output.  
> To get in the region of 200w output then we are going to need say 140v 
> at about 1.5A.
>
> With 100w out we could perhaps use 48v at about 2.2A.
>
> I was thinking of generating this using an off the mains SMPSU and PWM 
> it with the envelope signal.
>
> Perhaps this is more power than you would like to generate?  If so 
> then no problem, we can use a different PSU for Thor.
>
> 73's Phil...VK6APH
>
>
> ----- Original Message ----- From: "Jeroen Bastemeijer" 
> <j.bastemeijer at tudelft.nl>
> To: <phil at pharman.org>
> Cc: "HPSDR discussion list" <hpsdr at hpsdr.org>
> Sent: Thursday, April 16, 2009 4:14 PM
> Subject: Thor
>
>
>> Hi Phil,
>>
>> After a winter-sleep of Demeter ;-) , I'm catching up with the design
>> process.  (The process got stuck, due to a professional work-overload.)
>>
>> One of the problems I'm seeing is designing a low noise switcher with a
>> small difference between the input and the output. Therefor, I'm
>> exploring a new concept, which consists of a first switcher which
>> transforms the input voltage up to a higher voltage (range 24... 48V)
>> and then converts it back to the voltages we need (5V, 12V, -12V and if
>> necessary 3.3V). This higher voltage has some other advantages as well.
>>
>> The nice thing is that the higher voltage could be used for a
>> high-efficiency class E PA. I assume, a normal PA would run from 13.8V
>> or the battery directly. However, a high effeiciency class E-amplifier,
>> like Thor, needs a voltage of 40...48V. The switcher allows the use of
>> Thor for mobile operation! A situation where one certainly wants to have
>> a high efficiency PA.
>>
>> My quick question to you is: Can you give an estimate of the voltage
>> (and power) requirement of Thor?
>>
>> Thank you, 73 Jeroen PE1RGE
>>
>>
>
>
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