[hpsdr] Demeter = HPSDR power supply(?)

Fri Jun 8 11:01:28 PDT 2007

Just a thought

While you are thinking about adding another card to the bus you might
want to look at how this might limit you in your choice of cards..With
only 6 slots and upwards of 11 possible choices without even
considering a slot mounted Power Supply.

Peter Hughes
N7BMG

> -------- Original Message --------
> Subject: Re: [hpsdr] Demeter = HPSDR power supply(?)
> From: Chris Albertson <chrisalbertson90278 at yahoo.com>
> Date: Fri, June 08, 2007 12:29 pm
> To: Jeroen Bastemeijer <J.Bastemeijer at TUDelft.nl>,  HPSDR Group
> <hpsdr at hpsdr.org>
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> 
> I'm thinking recently about a project like HPSDR in that it also
> uses cards and a backplane and of course it to will need a power
> supply.  This project will use a 50 pin ribbon cable as a backplane
> so there are no DC power connectors on the backplane as with Atlas.
> So the power supply, or at least parts of it will be built on one
> of the cards.  I think that idea could work for HPSDR too.
> If you are going to communicate voltage and current levels and
> accept a digital command to "shut down", the power supply needs to
> be connected to the buss which means you need a card.  Once you are
> committed to using a plug-in card you may as well make it as large
> as the specification allows, Smaller cards don't make for a
> smaller system as the enclosure must be spec'd for the largest card.
> 
> So on the card you could mount some DC-DC converters for the voltages
> other than +12 and a regulator to take +13.8 to +12 then you feed
> your new card only 13.8V from either a lead acid battery or a
> standard "ham" power supply that most of us might already own.
> I don't see much reason to use the DC connector that is on the
> Atlas board if you are using a plug in card.  The new power supply
> card would plug into Altals and have just an Anderson Power Pole
> connector and a fuse on it's exposed side.
> 
> 
> --- Jeroen Bastemeijer <J.Bastemeijer at TUDelft.nl> wrote:
> 
> > ***** High Performance Software Defined Radio Discussion List *****
> > 
> > Dear All,
> > 
> > Please allow me to (further) introduce myself. My name is Jeroen 
> > Bastemeijer, I am a radio-amateur (callsign PE1RGE) of 32 years old.
> > In 
> > my professional life I'm an elecronics engineer working at the Delft 
> > University of Technology in the Netherlands. From the beginning of
> > the 
> > HPSDR project I have been a member of the reflector/project and, 
> > occasionally, I submitted a post to the reflector.
> > 
> > Last week I received the HPSDR boards and ATLAS-component kits from 
> > TAPR. They must have loved the boards at the customs.... they kept
> > them 
> > for almost four weeks!
> > 
> > Now the boards have arrived, it's time for some hands-on experiments!
> > 
> > The only thing I still need is a good power supply for the HPSDR. 
> > Becauses I wasn't sure which one to buy, I looked around on the 
> > internet. Off course I did some research on the PicoPSU, and I looked
> > 
> > into "ordinary" computer power supplies as well. Unfortunately, I 
> > couldn't find a power supply which seemed the ultimate solution for
> > the 
> > High Performance SDR project.
> > 
> > After giving it some thought, I send an E-mail to Phil N8VB. To him I
> > 
> > proposed to add a custom power supply to the HPSDR project. His
> > reply:  
> > < I agree that we need a custom power supply solution. Just send your
> > 
> > proposal to the HPSDR list. >
> > 
> > So, here it is.... my proposal! :-)
> > 
> > First thing the power supply needs is a name. So I have been looking 
> > into the Greek gods and other creatures, and I found.....
> > 
> > "DEMETER"
> > 
> > "Demeter" is the Goddes of  grain and fertility , the pure nourisher
> > of 
> > the youth and the green earth, the health-giving cycle of life and 
> > death, and preserver of marriage and the sacred law.
> > 
> > The first part of the description, really applies to a power supply.
> > The 
> > last part.... not really, but we can't blaim her, at that time the
> > power 
> > supplies still had to be invented. Furthermore, I like the name, it's
> > 
> > easy to pronounce. ;-)
> > 
> > Second step in the design process will be to find other enthusiasts
> > who 
> > are willing to participate in the design-process and to determine the
> > 
> > specifications for the power supply.
> > 
> > What I was thinking about:
> > * Output voltages +12 Volt, +5 Volt, -12 Volt (current ratings to be 
> > detrmined)
> > * An optional standby power supply for the OCXO (24 Volt?) and the 
> > GPS-engine of Gibraltar
> > * Electronic (software) switch on/off
> > * Input voltage: 13,8 Volt (mobile use), 110 Volt, 230 Volt
> > * Computer monitoring of the currents and voltages
> > * Output protection (crow-bar) and current limiters
> > * ............
> > 
> > Because this project is not determined by one individual, we should 
> > first agree on the specs for the project, so:
> > 
> > If you have any suggestions, questions, ideas, or data for the
> > Demeter 
> > spec-sheet, please be so kind to E-mail them to me and the
> > HPSDR-community.
> > 
> > Looking forward to your response!
> > 
> > 73 Jeroen PE1RGE
> > 
> > -- 
> > Ing. Jeroen Bastemeijer
> > 
> > Delft University of Technology
> > Department of Electrical Engineering
> > Electronic Instrumentation Laboratory
> > Mekelweg 4, Room 13.090
> > 2628 CD Delft
> > The Netherlands
> > 
> > Phone: +31.15.27.86542
> > Fax: +31.15.27.85755
> > E-mail: J.Bastemeijer at TUDelft.nl
> > GPS: Lat N52.00002 Lon E4.37157 Alt 46.2m
> > 
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> > 
> 
> 
> Chris Albertson
>   Home:   310-376-1029  chrisalbertson90278 at yahoo.com
>   Office: 310-336-5189  Christopher.J.Albertson at aero.org
> 
> 
>        
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