[Skimmertalk] Red Pitaya set up with N6TV's instructions

[Dai NAGAKURA]

When I had run 7 SDRs ( RP=3 , AFEDRI=2 ,QS1R and S9-C ) 
for  testing SDR full Skimmer,

Room temperature was over 38degC even in early spring.
I used three strong desk fan other than each SDR's cooling fan
towards to SDRs and PCs.

Outsides cooling fan is must for QS1R to run RTTY SkimServ.
This is my QS1R.
http://air.ap.teacup.com/jf2iwl/img/1476521828.jpg

73 
Dai JF2IWL

On Fri, 06 Oct 2017 00:26:45 +0000
Martin Rath <martin.rath at gmail.com> wrote:

> Hi,
> 
> Reading all this I'm starting to wonder by I bought the more expensive
> aluminium case... the usual temperature around the shack here is about 32c.
> I now have a large 12v fan powered through the 5v usb port. It's run slow
> and quite and the temperature is about 64c skimming 6 bands. The QSR1 next
> to it uses some passive cooling as i just placed a larger heatsink on top
> of it.
> 
> 73's Martin 9V1RM
> 
> On Fri, 6 Oct 2017 at 05:08, <dd5xx at web.de> wrote:
> 
> > Thanks for info Bob. I want to share my experience:
> >
> > I used the aluminium case before and with the help of your script I
> > monitored the temperature. I never exceeded 67° C even after long working
> > periods (several hours!) and while running sdr_transceiver_hpsdr for the
> > use of 6-band-CW-decode. I cannot explain why my RedPitaya was cooled down
> > better than yours. One hour ago I did a test and replaced the aluminium
> > case with the original RedPitaya plastic housing. Under this housing I
> > installed a fan "SUNON MagLev DC5V ~0.55W". The fan sits exactly (!) above
> > the FPGA heat sink, it fits perfect between FPGA heat sink and plastic
> > housing. I want to emphasize, the cooling fan does not sit above/outside
> > the plastic housing but directly on top of the FPGA heat sink. With this
> > setup the maximum temperature achieved was 56° C. The temperature decreased
> > about 10° C. I definitely will stay at this setup, the fan is doing a great
> > job and I am quite happy.
> >
> > Just wanted to share this information with you.
> >
> > Best 73
> > Saki, DD5XX
> >
> >
> >
> > Gesendet: Donnerstag, 05. Oktober 2017 um 02:56 Uhr
> > Von: "Bob Wilson, N6TV" <n6tv at arrl.net>
> > An: dd5xx at web.de, "SkimmerTalk Reflector" <skimmertalk at contesting.com>
> > Betreff: Re: [Skimmertalk] Red Pitaya set up with N6TV's instructions
> >
> > For Alpine Linux running on the Red Pitaya, try this version of the
> > temperature / voltage display script that I just uploaded (it was modified
> > by Pavel Demin to work in the ash shell):
> >
> > http://www.kkn.net/~n6tv/xadc-new.sh
> >
> > According to the FPGA data sheet, 85° C. is the absolute maximum
> > temperature supported by the FPGA.  Of course, heat is the enemy of all
> > electronics (this is why so many un-cooled QS1Rs like mine eventually
> > failed), so the cooler you can keep it, the better.
> >
> > To cool the aluminum case, I simply mounted a 30mm 5V fan a few mm above
> > the top center of the case, right above the center of the heat sink.  That
> > required drilling and tapping some small mounting holes.
> >
> > Since there is no room inside, and no cooling holes, it's about the only
> > place to put it.  You can then carefully run two thin power wires into a
> > gap on the left side of the case to bring them inside, then carefully
> > solder or somehow connect those two wires to the power pins next to the
> > Ethernet connector (the positive pin is closest to the center of the
> > case).  This Red Pitaya is currently running 66° C with the ambient room
> > temperature around 24° C.
> >
> > The Red Pitaya next to it in a plastic case with a similar fan on top is
> > running 58° C.
> >
> > When the room got very warm on a hot day (28° C.) I saw the temperature of
> > the Red Pitay in the metal case get as high as 78° C., which was too close
> > to the limit IMHO.  After adding the fan on top, the most I've seen is
> > around 70° C.
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> >
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-- 
Dai NAGAKURA <ndai at cameo.plala.or.jp>