[hpsdr] Status Thor?

[Phil Harman]

Hi Stijn,

I've not heard from the last project leader - Steve,  G1YLB - for quite a 
while so assume the project has stalled for the time being.

There is support for a Class E amplifier in Penny(Lane) and also the KD5TFD 
version of PowerSDR.

My original low power tests on 160m were very encouraging - I'd really like 
to see this project progress, just don't have the spare time myself at the 
moment.

It also looks like the  SGC 'Mini-Lini (TM)'  Class E PA has not made it 
into a commercial product:

< http://www.sgcworld.com/500watt.html >

perhaps we could acquire or gain access to the IP and run with the project 
ourselves?  Since, using Penny, we can independently adjust the phase 
relationship between the envelope and RF drive signals, on a band-by-band 
basis, we should be able to overcome most of the problems that beset earlier 
designs.

I gather one of the problems with the SGC design was getting the PWM 
envelope modulator to drop to 0v during the trough of the modulation.  To 
get round this they ran the PA in Class A for small input levels - an 
innovative solution.  The other problem is that the bandwidth of the 
envelope is much higher than the bandwidth of the voice modulation. If you 
think of the envelope of a two-tone test signal then when the envelope goes 
to zero there is an almost instantaneous change in direction of the envelope 
voltage - this needs lots of bandwidth to keep the transition clean.  With 
higher frequency SMPSU chips now available it may make the design of the 
envelope LPF some what simpler -  not something I've recent experience with.

Anyone have the time and skills to run with this project?

73 Phil...VK6APH




----- Original Message ----- 
From: "Stijn" <stijn at pe1rks.nl>
To: "OpenHPSDR" <hpsdr at lists.openhpsdr.org>
Sent: Sunday, August 07, 2011 12:29 AM
Subject: [hpsdr] Status Thor?


> ***** High Performance Software Defined Radio Discussion List *****
>
> It has been quite a while since there where any updates about Thor.
> Is there anyone who can shed some light on the status of Thor?
> Is the project still alive and is there already some support for Thor in 
> the software/hardware?
>
> Just curious,
>
> Stijn Nestra PE1RKS
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