I have an (untested) LPU, but it's asking for a "regulated power supply". I'm looking at amateur radio power sources and some of them are flagged as "switching". How careful do I need to be in staying away from those, considering (*) the LPU probably filters out at least some of the noise, and (*) these power supplies were designed for amateur radio use and are likely heavily filtered to begin with.<br>
<br>Erik KE7YOA<br><br><div class="gmail_quote">On Sat, Feb 26, 2011 at 1:05 PM, David McQuate <span dir="ltr"><<a href="mailto:mcquate@sonic.net">mcquate@sonic.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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Hi Maximo,<br>
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.<br>
<br>
I have Metis, Mercury, Penelope and Excalibur, and my +5v supply
current is 1.79 amp.<br>
With only Metis and Mercury, it is 1.56 amp.<br>
<br>
Of these cards Penelope is the only one needing +12v, and that's
only for the 0.5 watt power amp IC.<br>
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.<br>
<br>
Dave<br>
wa8ywq<br>
<br>
On 2/26/2011 11:34 AM, Maximo EA1DDO_HK1DX wrote:
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<br>
Hi,<br>
<br>
As a HPSDR begginer with just the Atlas, Mercury EU and the still
comming Metis, I need now the power supply.<br>
I guess that 5VDC is all I need to run with the basic stuff I said
before.<br>
<br>
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.<br>
<br>
I found a few options and I would like to share with you, to get
your opinion;<br>
<br>
<a href="http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=130417466390" target="_blank">http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=130417466390</a><br>
<br>
<a href="http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=280584969393" target="_blank">http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=280584969393</a><br>
<br>
<a href="http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=290509371602" target="_blank">http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=290509371602</a><br>
<br>
<a href="http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=390103502122" target="_blank">http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=390103502122</a><br>
<br>
What you think?<br>
<br>
Thank you<br>
<br>
73, Maximo - EA1DDO/G<br>
<br>
<pre><fieldset></fieldset>
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