[hpsdr] Pandora's Box

[pvharman at arach.net.au]

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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