Any one running any SDR solutions
#4
If you want to listen use rtl_fm (in rtl_sdr).  It's very efficient but it has no GUI for tuning.  Use a GUI program to find what you want to listen to then set up some little scripts to call rtl_fm with the right frequency, mode, PPM correction, etc.  I had a cron job making daily podcasts of the BBC Newshour by recording in MP3 through Sox, worked quite well.  This was on a Raspberry Pi 3B.  It would work fine for monitoring a repeater, just get the right squelch level by experimenting.  Or any single frequency really.  It's not that practical to make it scan because if you go out of a 2 MHz range you get all these delays waiting for the PLL to lock.  1 dongle per frequency or 2 MHz band might work out, not sure how you'd combine the audio.  Try rtl_fm --help and study the output.

My newshour script:
Code:
#!/bin/sh
adate=`date +"%Y-%m-%d_%H-%M"`

/usr/local/bin/rtl_fm -f 89300000 -M fm -s 190k -p 59 -r 48k - | sox -t raw \
-r 48k -b 16 -e signed-integer -c 1 -V1 - -t  mp3 bbc_nh_$adate.mp3 trim 0 59:50

BBC is rebroadcast on a local NPR FM station here late at night.

It's the flashy GUI junk that's wasting CPU because none I've seen yet use the GPU for that.  Cubicsdr has several spectrum displays plus a waterfall or two going all the time, no way to turn them off.  Other than that it's not too bad.  It doesn't use Gnuradio like GQRX I don't think.  Gnuradio has tons of Python, not very efficient.


Messages In This Thread
Any one running any SDR solutions - by oxoocoffee - 02-15-2020, 09:10 AM
RE: Any one running any SDR solutions - by ab1jx - 02-16-2020, 09:30 AM
RE: Any one running any SDR solutions - by ab1jx - 02-26-2020, 06:07 PM
RE: Any one running any SDR solutions - by ab1jx - 03-04-2020, 12:01 PM

Possibly Related Threads…
Thread Author Replies Views Last Post
  Pinebook Pro freezes when running on battery petaramesh 5 215 09-22-2022, 12:43 AM
Last Post: petaramesh
  Linus Torvalds using M2 Macbook Air running Linux orbital 17 888 09-09-2022, 03:57 PM
Last Post: orbital
  Running Libgdx sdk on pinebookpro Nick_dnepr 2 2,185 10-02-2020, 07:56 AM
Last Post: Nick_dnepr
  PBP running shipping Manjaro won't wake from suspend fornio 2 3,135 07-21-2020, 07:04 AM
Last Post: vancheese
  Pinebook Pro seems to "seize up" after running any OS... rick1959 5 4,970 06-14-2020, 07:33 PM
Last Post: rick1959
  Screen burn in after running for a few min Flapjack 2 3,061 06-13-2020, 06:39 AM
Last Post: matosys
  PBR running hot brzegorz 10 7,821 01-22-2020, 02:55 PM
Last Post: wrzomar

Forum Jump:


Users browsing this thread: 1 Guest(s)