Modified rtl_fm, frequency, signal level, date and time, speed test, dynamic squelch, single-shot mode

[Sdr Guru]

Hi

I've modified slightly rtl_fm.

-M nil
-E
log1: enable logging frequency, signal level, date and time - squelch
open
log2: enable logging frequency, signal level, date and time - squelch
closed
log3: enable logging frequency and signal level
log4: enable logging frequency and signal level
speedtest: enable scanning speed test
ds1: enable dynamic squelch 1
-1 enables single-shot mode

---
rtl_fm -M nil -f 101.3M:101.8M:100k -l 20 -E log1 -E log2 /dev/null
freq, 101300000,Hz,-,signal, 31, 20,-,2014.06.05,time,16:16:30.068
squelch open
freq, 101300000,Hz,-,signal, 18, 20,-,2014.06.05,time,16:16:30.197
freq, 101300000,Hz,-,signal, 18, 20,-,2014.06.05,time,16:16:30.327
freq, 101300000,Hz,-,signal, 18, 20,-,2014.06.05,time,16:16:30.457
freq, 101300000,Hz,-,signal, 19, 20,-,2014.06.05,time,16:16:30.587
freq, 101300000,Hz,-,signal, 18, 20,-,2014.06.05,time,16:16:30.717
freq, 101300000,Hz,-,signal, 18, 20,-,2014.06.05,time,16:16:30.847
freq, 101300000,Hz,-,signal, 19, 20,-,2014.06.05,time,16:16:30.977
freq, 101300000,Hz,-,signal, 18, 20,-,2014.06.05,time,16:16:31.107
freq, 101300000,Hz,-,signal, 18, 20,-,2014.06.05,time,16:16:31.237
freq, 101300000,Hz,-,signal, 18, 20,-,2014.06.05,time,16:16:31.367
freq, 101300000,Hz,-,signal, 18, 20,-,2014.06.05,time,16:16:31.497
freq, 101400000,Hz,-,signal, 17, 20,-,2014.06.05,time,16:16:31.627
freq, 101500000,Hz,-,signal, 15, 20,-,2014.06.05,time,16:16:31.758
freq, 101600000,Hz,-,signal, 40, 20,-,2014.06.05,time,16:16:31.887
squelch open

---
rtl_fm -M nil -f 101.3M:101.8M:100k -l 300 -E log4 /dev/null
freq, 101300000,Hz,-,signal, 28, 300
freq, 101400000,Hz,-,signal, 16, 300
freq, 101500000,Hz,-,signal, 15, 300
freq, 101600000,Hz,-,signal, 35, 300
freq, 101700000,Hz,-,signal, 24, 300
freq, 101800000,Hz,-,signal, 15, 300
freq, 101300000,Hz,-,signal, 18, 300
freq, 101400000,Hz,-,signal, 17, 300
freq, 101500000,Hz,-,signal, 15, 300
freq, 101600000,Hz,-,signal, 46, 300
freq, 101700000,Hz,-,signal, 27, 300
freq, 101800000,Hz,-,signal, 16, 300
freq, 101300000,Hz,-,signal, 18, 300
freq, 101400000,Hz,-,signal, 17, 300
freq, 101500000,Hz,-,signal, 15, 300
freq, 101600000,Hz,-,signal, 36, 300
freq, 101700000,Hz,-,signal, 26, 300
freq, 101800000,Hz,-,signal, 16, 300
freq, 101300000,Hz,-,signal, 17, 300
freq, 101400000,Hz,-,signal, 16, 300

---
rtl_fm -M nil -f 101.3M:101.8M:100k -l 300 -E speedtest /dev/null
7.61 steps/s - elapsed time 789 ms - 6 steps
7.69 steps/s - elapsed time 780 ms - 6 steps
7.69 steps/s - elapsed time 780 ms - 6 steps
7.69 steps/s - elapsed time 780 ms - 6 steps
7.69 steps/s - elapsed time 780 ms - 6 steps
7.69 steps/s - elapsed time 780 ms - 6 steps

SG

[John]

Post by Sdr Guru
Hi
I've modified slightly rtl_fm.

This looks like a great feature for rtl_fm and thanks for sharing your
progress. I have been trying to get it working in my setup and would
like more information on what it is doing.

Thanks,

John