Hello, i leave in France with tetrapol trames available. All install is ok. I use RTL key SDR.

I made a TMP folder in the DEMOD directory

I launch ./tetrapol_detector.sh

I return : 

sample rate: 2400000
decim: 150
output sample rate: 16000
samples per symbol: 2
channel[0]: -1 frequency=393515515, offset=734217 Hz
Using Volk machine: avx_64_mmx_orc
channel[1]: -1 frequency=392047081, offset=-734217 Hz
channel[2]: -1 frequency=392946409, offset=165111 Hz
channel[3]: -1 frequency=393325813, offset=544515 Hz
channel[4]: -1 frequency=392826967, offset=45669 Hz
channel[5]: -1 frequency=393206371, offset=425073 Hz
channel[6]: -1 frequency=392256690, offset=-524608 Hz
channel[7]: -1 frequency=393396073, offset=614775 Hz

Freq 393515515 freq err:  2001    freq: 734617.261646
Freq 392047081 freq err:   366    freq: -734143.850073
Freq 392946409 freq err:   994    freq: 165309.823303
Freq 393325813 freq err:  1613    freq: 544837.590405
Freq 392826967 freq err:   360    freq: 45740.961414
Freq 393206371 freq err:   843    freq: 425241.643213
Freq 392256690 freq err:   581    freq: -524491.716589
Freq 393396073 freq err:  1311    freq: 615037.154883

Freq 393515515 freq err:  1962    freq: 735009.723584
Freq 392047081 freq err:   358    freq: -734072.181348
Freq 392946409 freq err:   977    freq: 165505.293518
Freq 393325813 freq err:  1585    freq: 545154.581641
Freq 392826967 freq err:   460    freq: 45832.910699
Freq 393206371 freq err:   823    freq: 425406.229443
Freq 392256690 freq err:   573    freq: -524377.189514
Freq 393396073 freq err:  1402    freq: 615317.472778

Freq 393515515 freq err:  1558    freq: 735321.261206
Freq 392047081 freq err:   292    freq: -734013.718341
Freq 392946409 freq err:   777    freq: 165660.597095
Freq 393325813 freq err:  1259    freq: 545406.324341
Freq 392826967 freq err:   237    freq: 45880.384836
Freq 393206371 freq err:   657    freq: 425537.629602
Freq 392256690 freq err:   458    freq: -524285.634351
Freq 393396073 freq err:  1135    freq: 615544.542529

And a lot of files in TMP FOLDER are available

examples :

cch_392045910.json

channel392045910.bits

etc ...

And now ? What can i do ? how to use the kit for listening ?

If i lauch ./sysop_env.sh i think there is an error of missing .cfile

gr-osmosdr v0.1.4-72-g164a09fc (0.1.5git) gnuradio 3.7.9.1
built-in source types: file fcd rtl rtl_tcp uhd hackrf bladerf rfspace airspy redpitaya
data/391.cfile: No such file or directory

FATAL: can't open file

Trying to fill up 1 missing channel(s) with null source(s).
This is being done to prevent the application from crashing
due to gnuradio bug #528.

sample rate: 0
decim: 125
output sample rate: 0
samples per symbol: 0
Traceback (most recent call last):
  File "./demod/demod.py", line 166, in <module>
    tb = top_block()
  File "./demod/demod.py", line 78, in __init__
    raise ValueError('Output name template missing "%%".')
ValueError: Output name template missing "%%".