Step by step Receiver testing procedure

General discussion and support for the Peaberry SDR V1.

Step by step Receiver testing procedure

Postby Ve7pke » Sun Dec 30, 2012 4:44 am

I am try to test out the receiver portion of my peaberry.
So what software and what setting please?
I have tried sdr-radio and it looks like I am tuning it and I get noise. I seem to only recieve the center frequency as a tone. So figure I have messed up the hardware but not sure.
Any links to how to go through things. I am not tied to SDR Radio as it wont allow tx.

Thanks
Dave
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Re: Step by step Receiver testing procedure

Postby kb3vuk » Sun Dec 30, 2012 2:53 pm

I would try HDSDR along with the ExitIO Si570.dll file that allows the software to fully control the local oscillator, you may not be tuning anything as the SDR software needs additional files to control the LP.Check one of my earlier posts about receiver troubleshooting, as you describe it that was pretty much a word-for-word description of my problem when I was getting the receiver to work. If you have a scope and RF generator you can use the block diagram and schematic to trace the signal back to the SoC to see if there is a HW mistake. I would first get the config tool and make sure the you are actually tuning the LO. I would also reference the Ensemble RXTX kit since the receive front end is pretty much Identical and the build notes go into a lot of detail. Also make sure you took care in winding T2.

http://pe0fko.nl/CFGSR/

http://www.hdsdr.de/hardware.html

http://makeprojects.com/Project/Softwar ... OBUqDnppHE

http://www.wb5rvz.com/sdr/ensemble/


Good luck!
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Re: Step by step Receiver testing procedure

Postby Ve7pke » Sun Dec 30, 2012 5:23 pm

Thanks.
I did some quick checking last night before shutting down as I just can't let things go when it almost done. ;-)
First question is can you troubleshoot the RX without it plugged into USB? Do you have to have SDR software running?
Where I am at is .
Built for40,30',20
Put a -5dbm 14.000 MHz signal into the front end with unit powered up on 12V and plugged into PC with drivers loaded so OS shows Peaberry devices. Can play sounds etc. Trace signals and signal around T2 dont look right. I will do some digging but I figure the issue is I wound the T2 per directions and got the 6 wires in the wrong holes since given the lack of clear direction it's a crap shoot.

You have 6 holes on the board. The two with the line on the PCB I guessed are the single winding?
Then the next pair should be winding one of Bifilar?
The next pair should be second winding. I would love to see a quick diagram of how T2 is supposed to be wired. I hope the the ensemble directions will help.

On the other side I have a 14.08 square wave to the U6. The Si570 is at 4 times that frequency correct?

From my view now the Peaberry kit is excellent, easy to build, but the directions on the transformer installations are missing. I would think a couple of waveforms on a scope around U6 and T2 would be a great addition to common knowledge. I guess I may have volunteered to do that. ;-) Of course I can provide scope traces of a non working unit. :D For now.

Thanks and I am getting excited about getting this on the air.

Thanks to the creator of this fantastic project.
Dave
VE7PKE
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Re: Step by step Receiver testing procedure

Postby Ve7pke » Mon Dec 31, 2012 12:53 am

After chasing the signals around a bit. Pointed to T2
I redid T2 again. Put it back in and seemed to get the same signals around T2. I think it was in properly first time.
Hooked up HDSDR and figured out where the Extdll was. Figured out the basics of HDSDR.
Listening around on 40, 30 and 20 and it even works.
WWV 10.000 comes in nicely.

Now on to transmitter.

Thanks for all the pointers.

Dave
VE7PKE
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Re: Step by step Receiver testing procedure

Postby kb3vuk » Mon Dec 31, 2012 2:56 am

Awesome! Glad you got it working!

I agree that the kit is nice and the addition of on-board audio processing was the next best evolution. I just finished mine last night and for my first radio kit I'm completely satisfied with the experience. Today I took some gear up to my folks house and stuck a makeshift dipole in the attic and started tuning 40m and 20m, it worked and sounded great. I still have yet to test the transmitter but for the time being I'm limited to CW on 40 and living in a ground level apartment pretty much rules out the radio hobby - the finished project will be a mobile rig.

As far as the construction went I found it to be challenging but not overly difficult. I too discovered that yes the USB needs to be connected, software can't control the board without the proper files, how you wind toroids matters :D Transformer construction in general is something that needs more attention as well as test point procedures/data. After digging though the web and some books I had the answers did present them selves. Open source is awesome!

http://www.wb5rvz.com/sdr/common/Common ... oid_xfrmrs

http://www.wb5rvz.com/sdr/common/ToroidWindingHints.htm

Good luck with the transmitter part!
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