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

[Martin Rath]

Hi Mark,

I would be tempted to say no as in the case of CWSL_Tee all the additional
processing is done on the PC side. I may however be wrong.


73's Martin


On Fri, 6 Oct 2017 at 08:33, Mark n2qt <n2qt.va at gmail.com> wrote:

> Is there a computational as well as thermal impact if rtty skimming is
> used in addition to
> or instead of cw only?
>
> Mark. N2QT
>
> > On Oct 5, 2017, at 8:26 PM, 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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