Dongle shift is calculated but not always used

[filipsPL]

2019-01-22 20:40  SDR device found!  
2019-01-22 20:40  Recalibrating the dongle...  
-0.179
2019-01-22 20:40  Using the good old dongle shift (a): 0 ppm 

[somkar1]

For me also dongle shift is not working. It is not even finding new dongle shift and later when I checked in detail, the kal is not finding any frequencies many times. I tried on debian and also on raspberry 3 b+ both same thing happening.

[filipsPL]

and what is the output of the kal itself? Does it work for you?

[somkar1]

There are two problems. One is Kal itself doesn't work at times which only its author can solve.

Our problem is calibrate.sh is only run and not the calibrate_full.sh. So there is no dongleshift.txt or gsm_channel.txt files to start with.

channel=$(cat $channelFile) is empty as in autowx2 config file only calibrate is run and calibrate_full is commented by default.

Kal doesn't find anything if the -c $channel is empty. Hence calibrate.sh fails to find the shift.

When manually run output is

$ kal -s GSM900 -e 74 -g 49.6 2 Found 1 device(s): 0: Generic RTL2832U OEM

Using device 0: Generic RTL2832U OEM Found Rafael Micro R820T tuner Exact sample rate is: 270833.002142 Hz [R82XX] PLL not locked! Setting gain: 49.6 dB kal: Scanning for GSM-900 base stations. GSM-900: chan: 25 (940.0MHz + 733Hz) power: 4392752.42 chan: 27 (940.4MHz + 797Hz) power: 3285022.45 chan: 29 (940.8MHz + 824Hz) power: 2098686.73 chan: 30 (941.0MHz + 1.355kHz) power: 2575591.98 chan: 66 (948.2MHz + 145Hz) power: 1585427.24 chan: 69 (948.8MHz + 956Hz) power: 2206713.86 chan: 70 (949.0MHz + 971Hz) power: 4093341.39 chan: 77 (950.4MHz + 1.527kHz) power: 1795610.18 chan: 78 (950.6MHz + 1.143kHz) power: 2098148.96 chan: 81 (951.2MHz + 1.701kHz) power: 4590153.19 ...chan 124 Difference of offsets between channels is >1kHz. This likely means that the correct PPM is too far away and you need to provide a rough estimate using the '-e' option. Try tuning against a local FM radio or other known frequency first.

So this is what calibrate_full will get if we remove the comment. But calibrate_full won't have entered anything on to dongshift.txt($shiftfile) anyway so even if we run calibrate_full.sh still it won't work.

---

timeout 100 kal -c 27 -g 49.6 -e 0 2 Found 1 device(s): 0: Generic RTL2832U OEM

Using device 0: Generic RTL2832U OEM Found Rafael Micro R820T tuner Exact sample rate is: 270833.002142 Hz [R82XX] PLL not locked! Setting gain: 49.6 dB kal: Calculating clock frequency offset. Using GSM-900 channel 27 (940.4MHz) Tuned to 940.400000MHz (reported tuner error: 0Hz)

Hence calibrate.sh fails as there is no value given for -e $recentShift (which will be zero).