[hpsdr] Compact Power Supply for begginers

[David McQuate]

Hi Maximo,
   Some (many?) switching power supplies radiate RF energy on many 
harmonics of the switching frequency, possibly causing interference that 
you'll hear as you listen to your radio.  Some switchers seem to be well 
shielded and filtered and don't produce noticable RF.  I guess all you 
can do is try one and see how bad it is.

   I have Metis, Mercury, Penelope and Excalibur, and my +5v supply 
current is 1.79 amp.
With only Metis and Mercury, it is 1.56 amp.

Of these cards Penelope is the only one needing +12v, and that's only 
for the 0.5 watt power amp IC.
I'm currently using a very old linear power supply (+5v only).  I plan 
to build a linear supply that would handle all these cards, plus a 
Penny-Whistle 15W RF amp.

Dave
wa8ywq

On 2/26/2011 11:34 AM, Maximo EA1DDO_HK1DX wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
>
>
> Hi,
>
> As a HPSDR begginer with just the Atlas, Mercury EU and the still 
> comming Metis, I need now the power supply.
> I guess that 5VDC is all I need to run with the basic stuff I said before.
>
> A full ATX power supply from a computer is good but may be too large 
> for now, so I am thinking in a compact 5VDC switching power supply. 
> But I would like to get some directions from more experienced HPSDR users.
>
> I found a few options and I would like to share with you, to get your 
> opinion;
>
> http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=130417466390 
> <http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=130417466390>
>
> http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=280584969393 
> <http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=280584969393>
>
> http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=290509371602 
> <http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=290509371602>
>
> http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=390103502122 
> <http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=390103502122>
>
> What you think?
>
> Thank you
>
> 73, Maximo - EA1DDO/G
>
>
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