[Skimmertalk] Red Pitaya Input 2

[Bob Wilson, N6TV]

Dan,

Regarding INP1 failing, did you guys ever transmit on a nearby HF or 6m
antenna with 100W or more?  If you don't have a front end protector like
the DX Engineering Receiver Guard on the Red Pitaya input, in may be
possible for a nearby transmitter to damage it.

If you do need to use INP2, note that you'll have to move the jumpers
across pins 2 and 5 on INP2 just as you did on INP1, to bypass the built-in
attenuator.  There are separate attenuators jumpers for each input.

Jan's suggested edit is correct, though I don't see a file named
*/sbin/discovery.sh* on my 0.97 image.

You can edit the *start.sh* file using the *nano* full screen editor (or
*vi* if you're more comfortable with that one), e.g.

nano /opt/redpitaya/www/apps/sdr_receiver_hpsdr/start.sh

Note that you have the option to use input 1 or 2 on each of the 6
receivers that it starts, giving you the option to use INP1 for the low
bands and INP2 for the high bands, if you have two antennas.

Use Ctrl-X to exit the editor.  It will prompt you if you want to save your
changes.  Then reboot.

I assume you already edited or replaced */etc/rc.local* after you
reformatted the microSD card, otherwise the SDR won't start automatically.
The Red Pitaya 0.97 needs to have these lines to start the SDR receiver
automatically every time it powers up:

# Start the SDR Receiver compatible with HPSDR at boot time
cat /opt/redpitaya/www/apps/sdr_receiver_hpsdr/sdr_receiver_hpsdr.bit
>/dev/xdev
cfg
. /opt/redpitaya/www/apps/sdr_receiver_hpsdr/start.sh

If you're not comfortable trying to cut and paste these lines into the file
yourself, there's an another way.  Just enter these commands to save the
old *rc.local* file, fetch a new one with the required commands already in
place, and mark it executable:

cd /etc
mv rc.local rc.local.old
wget http://www.kkn.net/~n6tv/rc.local
chmod +x rc.local


73,
Bob, N6TV

On Tue, Aug 15, 2017 at 1:19 AM, Jan ok2zaw <honza at ok2zaw.com> wrote:

> Hi Dan!
>
> I do have the same problem at OL7M. When I run Spectrum analyzer, there is
> no sognal on IN1. PIC: http://www.ok2zaw.com/SDR/spectal.png  I used IN2
> but still board was "unstable". I do have another one which works great!
> I am sending the first one today back - I bought it directly on RP web. I
> think the best way is to write to support.
>
> Anyway, there is way to switch to IN2:
>
> /sbin/discovery.sh
>
> /opt/redpitaya/www/apps/sdr_receiver_hpsdr/start.sh
>
> To select IN 2 for all six receivers you'll need to replace
>
> sdr-receiver-hpsdr 1 1 1 1 1 1 &
>
> with
>
> sdr-receiver-hpsdr 2 2 2 2 2 2 &
>
> Vy 73 Jan OK2ZAW / OL9A / OL7M
>
>
> S pozdravem Jan Šustr
> Regards Jan
>
> http://www.ok2zaw.com
> http://www.qro.cz
>
>
>
> -----Original Message-----
> From: Skimmertalk [mailto:skimmertalk-bounces at contesting.com] On Behalf
> Of Dan Downard
> Sent: Tuesday, August 15, 2017 12:48 AM
> To: skimmertalk at contesting.com
> Subject: [Skimmertalk] Red Pitaya Input 2
>
>
> I configured my Red Pitaya per all of the excellent guidelines on this
> reflector.  Thanks to all.  Everything was working great, but now I have a
> problem:
>
> Something happened to the microSD card that came with my unit.   I bought
> a new microSD card and formatted it using the .97 image.  Everything
> appears to be working but no signals, and no waterfall on HPSDR, not even
> background noise, are present.
>
> I tried loading the Spectrum Analyzer app and noticed that Input 1 was
> dead but Input 2 seemed to be OK.  I am assuming that something happened to
> Input 1!
>
> Could someone tell me how to make Input 2 the primary receiver/antenna
> port?  I saw a Ubuntu script somewhere but can’t find it.
>
> Has anyone else had this problem?  I bought the unit from Mouser and am
> going to contact them once I verify the problem.
>
> Dan K4FXN
>