[hpsdr] Power Supplies

[Chris Albertson]

I've been wondering just how "clean" the typicall PC
power supply is.  My guess is that they splatter
all over the HF bands.  If so it's the last thing
you'd want inside a radio chassis. Also most of
the cheap power supplies make a lot of fan noise.
You need to hunt for quiet ones.   I've also
found that they will not power up unless under load
so you need a simulated load, a resister would
do but I used a broken disk drive because it
already had the connector on and acts as its
own heat  sink.  

I had not thought about the crowbar (it's a good
idea) but had planned on a 20 foot DC power cable
and some big inductors and caps.  

--- Eric Ellison <ecellison at gmail.com> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
> 
> Mike
> 
> Check the HPSDR achieves. Various ATX and newer style connectors and
> adapters, links to get them, power supply modifications, etc. were
> discussed
> in some detail when Atlas was being discussed last year.
> 
> I don't think ANY good fusing suggestions were made at that time.
> There WAS
> quite a bit of concern about connecting the Atlas boards to the
> monster ATX
> supplies. 
> 
> Thanks
> Eric
> 
> 
> -----Original Message-----
> From: hpsdr-bounces at hpsdr.org [mailto:hpsdr-bounces at hpsdr.org] On
> Behalf Of
> Mike Naruta
> Sent: Sunday, April 15, 2007 1:00 PM
> To: Mike Coles
> Cc: hpsdr at hpsdr.org
> Subject: Re: [hpsdr] Power Supplies
> 
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Ah, that's very interesting Mike.  Thank you.
> 
> 
> I planned on outboarding the power supply.
> Less heat in the HPSDR.  And my son gave
> me a beautiful chromed PC supply.
> 
> I plan to have an outside connector, with
> feedthru capacitors, ferrite beads, and
> overvoltage and overcurrent protection,
> then an internal cable to the Atlas.
> I'm a shielding freak.
> 
> I hope someone can tell me part numbers of
> some clamps/zeners.
> 
> 
> Also, can someone recommend 2 and 6 pin header
> sockets, as used on the UCB, Ozy, and other
> HPSDR stuff?  I've poked around Mouser and
> MPJA, but haven't found anything yet.
> 
> 
> 
> Mike - AA8K
> 
> 
> 
> Mike Coles wrote:
> > ***** High Performance Software Defined Radio Discussion List *****
> > 
> > Here's a  link describing the older pinout.
> > 
> > http://pinouts.ru/Power/dell_atxpower_pinout.shtml
> > 
> > 
> > 
> > On 4/15/07, Mike Coles <bluelip at gmail.com> wrote:
> >> Watch for the pinout of the Dell 'ATX' connector. I've come across
> >> some that weren't in line with the ATX standard.
> >>
> >>
> >> Mike
> >>
> >>
> >> On 4/15/07, Mike Naruta <mnaruta at comcast.net> wrote:
> >>> ***** High Performance Software Defined Radio Discussion List
> *****
> >>>
> >>> I've been thinking of adding some fuses
> >>> and crowbars upstream of my Atlas.
> >>>
> >>> Anybody know some good Zeners to use?
> >>>
> >>>
> >>> Mike - AA8K
> >>>
> >>>
> >>>
> >>> stoskopf at tri.net wrote:
> >>>> ***** High Performance Software Defined Radio Discussion List
> *****
> >>>>
> >>>> Pulled the power connector from an old Dell to check the Atlas. 
> All is
> >>>> well, but am wondering:  There have been several PC fried in our
> area
> when
> >>>> the power supplys lost regulation.  With several nearly
> irreplacible
> >>>> boards on the Atlas, is there any need to add some crowbar
> device
> between
> >>>> the Atlas and the supply or is simply purchasing a "name" supply
> adequate?
> >>>>
> >>>> N0UU
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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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