[hpsdr] Minibox PW-200-M Power Supply

[Duane - N9DG]

I've had a few days to play with the PW-200-M supply over the
weekend. In the end it works fine, but I don't really find
anything about it that is special either. And after reviewing
the specs more closely, I see that the rated running current
output is essentially the same as the Pico120 except for the
-12V.

I am running it from the same power supply that I use with
the SDR-1000. In order to do so I had to put two series
diodes in the + lead to drop the 13.8V down to something
closer to 12V. This is required since the +12V output from
the PW-200-M is just the input 12V fed through. It does
however have overvoltage protection if the input V is too
high as I found out. The PW-200-M simply shuts itself down if
the input V is too high.

The connector reorientation surgery looks doable, but I'm in
no hurry to try it. As for now the PW-200-M just plugs
directly in and hangs over the edge of the Atlas, won't
likely work with Pandora, but is OK for now. And the removal
of the HD power leads was just a pretty painless desoldering
operation.

One thing that I did not see change was the size and position
of the spikes in the passband. The before and after
screenshots I took look nearly identical. So the spikes that
I see must be something other than the PS. The original
supply that I used was just a generic PC supply. If the PS
was the cause of the spikes then I would have thought that
the PW-200-M would have look quite different, even if it
wasn't any quieter.

Duane
N9DG

--- Duane - N9DG <n9dg at yahoo.com> wrote:

> 
> I did order a PW-200-M for use with my one of A/J/O sets. I
> should have it around the end of this week. And I should
> know
> by sometime next week how well it works.
> 
> I decided to go this route since the current draw of the
> follow-on HPSDR boards is somewhat of an unknown. My
> thought
> is that the PW-200-M stands a better chance of being be "up
> to the task" of powering another module or two. The
> picoPSU-120 just seems to be "too close to the edge" to
> suit
> me, especially the -12V.
> 
> I did also order the 20-pin 9" jumper so that the PW-200-M
> can be mounted away from the board if need be. My other
> thought was to see if modifying the 20 pin connector on the
> PW-200-M board will be feasible or not (a 90 degree
> reorientation exercise). I will decide if I'll try to
> tackle
> that or not once the PW-200-M is here. If it can be, then
> there's a fair chance it too can be plugged directly into
> the
> Atlas and maybe even fit inside Pandora.
> 
> And more likely that not, the 4 pin pig tail cables that I
> think are soldered to the PW-200-M board itself will
> whimper
> just a little bit when I cut them off ;).
> 
> Duane
> N9DG



       
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