Search found 49 matches

by AH6DL
Wed Sep 02, 2015 10:09 pm
Forum: Code Corner
Topic: Linux
Replies: 54
Views: 91910

Re: Linux

@AB3XU SDR-J FM works okay but the audio isn't especially clean. As with most SDRs and GQRX, FM stereo is tough without strong signals. Note that the sdr-j shortwave receiver actually does a good job with VHF and UHF NBFM -- it isn't restricted in the frequency range! I haven't looked at the code in...
by AH6DL
Wed Sep 02, 2015 3:46 pm
Forum: Code Corner
Topic: Linux
Replies: 54
Views: 91910

Re: Linux

For my testing, I've found setting the sample rate at 1536e3 and the bandwidth to the same amount works, although with the unstable display and static. I've also had luck with 2048e3. I'll try 5e6 and see if that makes a difference. For what it's worth, after the last changes to the gr-osmosdr SDRpl...
by AH6DL
Tue Sep 01, 2015 9:39 pm
Forum: SDRplay related
Topic: SDRPlay and SDR-J (Linux)
Replies: 7
Views: 10762

Re: SDRPlay and SDR-J (Linux)

I've had good luck with SDR-J. It has been a while since I installed, it, but I recall I had to manually link the library as sdrplay suggested. You might also need to do an "sudo ldconfig -a" on the directory where you have the Miric's libraries installed if anything is changed after the installatio...
by AH6DL
Tue Sep 01, 2015 9:34 pm
Forum: Code Corner
Topic: Linux
Replies: 54
Views: 91910

Re: Linux

I've been toying with the sdrplay_source_c.cc code in gr-osmosdr and am convinced the problem with the static, which leads to the unstable amplitude level, is caused by packets from the SDRplay being corrupted in sdrplay_source_c::work I noticed that SDR-J, which doesn't experience this problem, han...
by AH6DL
Mon Aug 24, 2015 3:52 pm
Forum: SDRplay related
Topic: SDRplay with gr-osmosdr: a few answers, many questions
Replies: 18
Views: 28151

Re: SDRplay with gr-osmosdr: a few answers, many questions

Update -- I had a chance to try the i/32768 value in sdrplay.c.cc with the latest gr-osmosdr version and found it didn't resolve the bouncing noise issue. Looking at the SDR-J code, I see they used 2*i/1024 and 2*i/8192 so I tried i/512 and i/4096 with the gr-osmosdr code. It had some problems. Incr...
by AH6DL
Sat Aug 22, 2015 6:30 pm
Forum: SDRplay related
Topic: SDRplay with gr-osmosdr: a few answers, many questions
Replies: 18
Views: 28151

Re: SDRplay with gr-osmosdr: a few answers, many questions

Thanks kc2sci for finding the reason my small code change worked! I hadn't had time to dig into it further. I suspected something like this was the problem after looking at the API sample code and SDR-J. Analyzing the IQ output was a great idea! I haven't tried the patch with the latest gr-omsosdr r...
by AH6DL
Sat Jul 25, 2015 5:24 am
Forum: SDRplay related
Topic: ADS-B Support
Replies: 10
Views: 17823

Re: ADS-B Support

gr-air-modes almost works with the SDRplay gr-osmocom library. It doesn't crash, but isn't able to receive anything because the bandwidth stays at 1.536 MHz even with the sample rate set to 5 MSPS. Unfortunately gr-air-modes does not provide a way to set the bandwidth as far as I can tell. One solut...
by AH6DL
Fri Jun 26, 2015 4:16 am
Forum: Code Corner
Topic: rtl-sdr gr-osmosdr
Replies: 3
Views: 8538

Re: rtl-sdr gr-osmosdr

hackbox -- I've had similar frustrations with gr-osmosdr in the past. As you suspect, its not finding a support library it needs. Use the source from osmocom.org to make sure you have the latest pieces of gr-osmosdr. Second, make sure you have no left over installations of GNURADIO. Different packag...
by AH6DL
Mon Jun 22, 2015 1:45 am
Forum: Code Corner
Topic: Linux
Replies: 54
Views: 91910

Working GRC receivers for SDRplay in Linux

I've got SDRplay working reasonably well with GNUradio, allowing me to create some receivers for reception of FM radio and also narrowband FM and AM transmissions. I suggest trying this first with the gr-osmosdr installation instructions available in the Downloads section http://sdrplay.com/download...
by AH6DL
Sun Jun 21, 2015 2:06 am
Forum: SDRplay related
Topic: SDRplay with gr-osmosdr: a few answers, many questions
Replies: 18
Views: 28151

Re: SDRplay with gr-osmosdr: a few answers, many questions

WORKING!! (but with a few warts...) I now have an FM GRC receiver working with my modified gr-osmosdr code. There are a few warts, but it is receiving and demodulating signals without errors. http://www.transmitter.com/sdrplay/sdrplay-test-FM-receiver-20150630-working.grc.png For some reason the DC ...