[hpsdr] Pandora's Box

Wed Feb 28 21:18:43 PST 2007

Nathan Sokal invented the class E topology, and patented an EER
technique for SSB transmission back in the 70's.  I think he is a ham.
We might try to contact him and ask if he would be interested in
helping.

-----Original Message-----
From: pvharman at arach.net.au [mailto:pvharman at arach.net.au] 
Sent: Thursday, March 01, 2007 12:15 AM
To: Jason A. Beens
Cc: Ben Hall; hpsdr at hpsdr.org
Subject: RE: [hpsdr] Pandora's Box

Or D or F, yes!

Phil....

Quoting "Jason A. Beens" <jbeens at sensetechnologies.com>:

> Phil,
> Are you talking about a class-e based power amplifier?
> 
> -----Original Message-----
> From: hpsdr-bounces at hpsdr.org [mailto:hpsdr-bounces at hpsdr.org] On
Behalf
> Of pvharman at arach.net.au
> Sent: Wednesday, February 28, 2007 10:29 PM
> To: Ben Hall
> Cc: hpsdr at hpsdr.org
> Subject: Re: [hpsdr] Pandora's Box
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Whilst it is early days as yet in the planning of a PA (or more likely
> PAs) I 
> think that it is unlikely that one of modest power, say 100w, will fit
> in an 
> Atlas slot.  
> 
> The current thinking is to design a high efficiency EER (Envelope
> Elimination 
> and Restoration) PA and this intention has shaped some of the features
> of the 
> Penelope exciter project. 
> 
> In which case a special ( i.e. not 13.8v DC) mains power supply will
be 
> developed that again will not fit in an Atlas slot. 
> 
> In designing an enclosure allowing room for a switching PSU and PA
> external to 
> the Atlas based boards would be a good idea.
> 
> Sorry that I can't be more specific at the moment but the PA ideas are
> still at 
> an early stage. 
> 
> 73's Phil...VK6APH 
> 
> 
> 
> 
> 
> Quoting Ben Hall <kd5byb at bellsouth.net>:
> 
> > ***** High Performance Software Defined Radio Discussion List *****
> > 
> > Eric Ellison wrote:
> > 
> > Hi Eric and group!
> > 
> > > It looks like you really did open Pandora's box!
> > 
> > That's okay!  I wanted input from the user community and I'm happy
to 
> > have it - it's got people thinking and talking.  That's good!
> > 
> > > Actually she was an "All
> > > gifted" woman, and Zeus made her do what she did! We don't have a
> Zeus
> > yet!
> > > 
> > > 	SO
> > > 
> > > Why don't we forget the Box and rescue Pandora. Already she has
> released
> > her
> > > 'misery' here! 
> > 
> > Nah!  No misery, really - lots of good ideas and lots of ideas on
how 
> > people want to use the HPSDR.
> > 
> > > Larry wants everything front mounted, my wife wants all the
> > > 'ugly stuff' rear mounted, Cecil suggested side mounted others
below
> the
> > > table, some top shelf. Horst illustrated a home brew rack mount.
So
> far
> > the
> > > commenters have NOT agreed on ANYTHNIG box related. Most liked
> Pandora! 
> > 
> > That's okay!  Yes, it makes the task a little more complicated, but
> I've 
> > not yet come to the conclusion that all can't be happy.  Yet.  ;)
> > 
> > > I spent lunch searching through hundreds of Computer boxes. Last
> year I
> > > spent hours and hours Googling out the myriad of off the shelf
> extrusions,
> > > enclosures, even Rose Bopla custom enclosures. TenTec, FlexRadio
> were also
> > > in there! I never did find anything which had EXACTLY 6 slot
> openings.
> > 
> > I've not yet either, but did have a thought today.  If a power amp
is 
> > designed for the HPSDR, it will likely be more than one slot thick -

> > heatsinks and transformers and extra power wires to get in the 
> > voltage/currents needed.  So, say if an 8-wide case is found, we can

> > simply say that the extra three slots are for a future power amp
(or, 
> > some yet-unknown card) that needs more space.
> > 
> > > I think the best you are going to get a consensus on is a really
> well
> > > thought out, brainstormed, L shaped subchassis, with 6 slots,
> perhaps with
> > a
> > > slide in strip with 'grounding fingers' across the top to provide
> support
> > > and grounding. Just large enough to add screw mounts at each
> vertical
> > corner
> > > and some surplus side to side and in back to mount cable
management
> etc.
> > The
> > > outside facing logo could say "Pandora" with a little block off to
> one
> > side
> > > with arrow pointing (or down) saying "User Supplied Box".
> > 
> > I'm having a hard time visualizing what you've described above -
spent
> 
> > the day in a forest fire (which they call a controlled burn) at work
> and 
> > am a bit foggy from the antihistamine due to all the smoke.  I'll 
> > re-read this tomorrow and draw some pictures to myself and I'm sure
> I'll 
> > understand.
> > 
> > > That way Horst can draw 2 more rails and suspend Pandora in
> 'mid-air'
> > Larry
> > > can carve out a hole in the front, I can mount it on PCBoard
stock,
> or
> > > modified Gamer enclosure and someone can come up with a neat
> masonite
> > > enclosure '50's style'.
> > > 
> > > Just brainstorming here.
> > 
> > Brainstorming is good!
> > 
> > -- 
> > Thanks and 73,
> > Ben, KD5BYB
> > 
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> 
> 
> 
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