osmocom-sdr

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910 discussions

RTL-SDR Continuous Operation
by loay abdelrazek 25 May '18

25 May '18

Hello, would like to know, what is the average time that an RTL-SDR (R820T2) can run nonstop without affecting its internals The use case, is to sniff GSM packets noting that sniffing will take several intervals during the day, and the experiment should only run for 1 day , thus what could be the appropriate interval thanks

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R820T Loop Through
by Carl Laufer 25 May '18

25 May '18

Is there any reason for this to be turned on during normal operation of the RTL-SDR? Turning it off seems to reduce current usage by 10 to 20 mA. To turn it off set reg 0x05 bit 7 to 1. Seems to turned be on by default. Haven't seen any effects from turning it off.

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gr-osmodr patches
by andrea montefusco 25 May '18

25 May '18

Hi gr-osmosdr maintainer, can I respectfully ask if the several patches to the gr-osmosdr library, sent in the past months on this list, will have a chance to be considered in the near future? Many thanks in advance *am* -- Andrea Montefusco IW0HDV ------------------------------------------ As my old boss, an Apollo veteran, would often remind us “It’s good to be smart, but it’s better to be lucky.” Wayne Hale, Space Shuttle Flight Director

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[PATCH] Fix rtl_adsb hanging upon a signal in Fedora 27
by Pete Zaitcev 24 May '18

24 May '18

This code stayed unchanged for many years, but for some reason rtl_adsb started hanging upon exit: *b66116a5164b69281eacc42ae950; ^CSignal caught, exiting! <------ hangs here forever Examining it with gdb reveals that the demod thread waits peacefully on the condition variable, which we're trying to destroy. Either the signals killed all threads before, or condition variables were possible to destroy while other threads still waited on them. The easiest fix appears to be just cancel the demod thread and wait for it to exit before proceeding for the door. --- src/rtl_adsb.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/src/rtl_adsb.c b/src/rtl_adsb.c index 07fdd2a..9087de4 100644 --- a/src/rtl_adsb.c +++ b/src/rtl_adsb.c @@ -492,6 +492,8 @@ int main(int argc, char **argv) else { fprintf(stderr, "\nLibrary error %d, exiting...\n", r);} rtlsdr_cancel_async(dev); + pthread_cancel(demod_thread); + pthread_join(demod_thread, NULL); pthread_cond_destroy(&ready); pthread_mutex_destroy(&ready_m);

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fl2k file does not accept "-" as filename to read from stdin
by Ted Yapo 24 May '18

24 May '18

$ fl2k_file fl2k_file, a sample player for FL2K VGA dongles Usage: [-d device_index (default: 0)] [-r repeat file (default: 1)] [-s samplerate (default: 100 MS/s)] filename (use '-' to read from stdin) $ fl2k_file -s 8192000 - Failed to open - I'm perfectly willing to pitch in and fix this. How do you prefer to receive contributions?

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Osmo-trx compile error
by Babar Ali 24 May '18

24 May '18

I received following error while compling osmo-trx on rasbian, i have already build libosmocore-0-11-0 from source and installed but despite this still unable to compile osmo-trx, any one can help to resolve the issue! configure: error: Package requirements (libosmocore >= 0.11.0) were not met: Requested ‘libosmocore >= 0.11.0’ but version of Osmocom Core Library is UNKNOWN Consider adjusting the PKG_CONFIG_PATH environment variable if you installed software in a non-standard prefix.” I have already build following components on Rasbian from source successfully LimeSuite SoapySDR SoapyUHD libosmocore-0.11.0/ libosmocore-0.96.0 Regards Babar

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[osmo-fl2k] Code issues/warnings report
by SDR is cool 24 May '18

24 May '18

Hi everybody, Thank you for developing osmo-fl2k. Just wanted to report some relevant code issues/warnings I've found in osmo-fl2k's codebase: hope you'll find it useful. All the issues reported below are based upon the source code as seen in commit 16b102efcdae6c33b1761e4f2da8c507eed03bb4 (osmo-fl2k's git repo current HEAD). - libosmo-fl2k.c:213 Implicit cast of expression '(pll_clock * mult) / (uint32_t) div' from 'uint32_t' type to 'double' type (perform explicit cast to avoid the loss of the fractional part. Is it intentional?). - libosmo-fl2k.c:216 Implicit cast of expression '(uint32_t) offset * frac' from 'uint32_t' type to 'double' type (perform explicit cast to avoid integer overflow). - libosmo-fl2k.c:250 Absolute value function 'fabsf' given an argument of type 'double' but has parameter of type 'float' which may cause truncation of value (use function 'fabs' instead). - libosmo-fl2k.c:252 Absolute value function 'fabsf' given an argument of type 'double' but has parameter of type 'float' which may cause truncation of value (use function 'fabs' instead). - libosmo-fl2k.c:262 Absolute value function 'fabsf' given an argument of type 'double' but has parameter of type 'float' which may cause truncation of value (use function 'fabs' instead). - libosmo-fl2k.c:263 Incorrect 'fprintf' format for argument 'target_freq' (use '%lu' format specifier and add explicit cast like: '(unsigned long)target_freq' or use 'PRIu32' macro from 'inttypes.h'). - libosmo-fl2k.c:458 Useless if (expression 'dev' is always true). - libosmo-fl2k.c:577 There might be dereferencing of a potential null pointer 'dev->xfer' (malloc call at may return NULL: line 574). - libosmo-fl2k.c:580 A potential null pointer is given to 'memset' function (malloc call may return NULL: line 579). - libosmo-fl2k.c:583 A potential null pointer is given to 'memset' function (malloc call may return NULL: line 582). - libosmo-fl2k.c:586 Incorrect 'fprintf' format for argument 'dev->xfer_buf_num' (use '%lu' format specifier and add explicit cast like: '(unsigned long)dev->xfer_buf_num' or use 'PRIu32' macro from 'inttypes.h'). - libosmo-fl2k.c:593 Incorrect 'fprintf' format for argument 'i' (use '%u' format specifier). - libosmo-fl2k.c:650 Incorrect 'fprintf' format for argument 'i' (use '%u' format specifier). - libosmo-fl2k.c:856 Incorrect 'fprintf' format for argument 'dev->underflow_cnt - underflows' (use '%lu' format specifier and add explicit cast like: '(unsigned long)(dev->underflow_cnt - underflows)' or use 'PRIu32' macro from 'inttypes.h'). - fl2k_file.c:98 Incorrect 'fprintf' format for argument 'repeat_cnt' (use '%lu' format specifier and add explicit cast like: '(unsigned long)repeat_cnt' or use 'PRIu32' macro from 'inttypes.h'). - fl2k_file.c:169 The 'r' variable is assigned values twice successively (missing return code check after first assignment?). - fl2k_fm.c:570 The 'r' variable is assigned values twice successively (missing return code check after first assignment?). - fl2k_tcp.c:193 The 'r' variable is assigned values twice successively (missing return code check after first assignment?). - fl2k_test.c:259 Incorrect 'fprintf' format for argument 'dev_index' (use '%lu' format specifier and add explicit cast like: '(unsigned long)dev_index' or use 'PRIu32' macro from 'inttypes.h'). - fl2k_test.c:278 Integer overflow (attempt to store value 255 in a char type variable (which may be signed: range [-128, 127]): redefine 'buffer' variable as 'signed char' type to fix the issue). - fl2k_test.c:284 The 'r' variable is assigned values twice successively (missing return code check after first assignment?). - fl2k_test.c:301 Useless if (expression 'do_exit' is always true). Regards, SDR_is_cool

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Blacklist files in /etc/modprobe.d/
by Álvaro Cebrián Juan 15 May '18

15 May '18

Hi everyone, Do osmo-sdr <https://git.osmocom.org/osmo-sdr> or gr-osmosdr <https://git.osmocom.org/gr-osmosdr> place blacklist files in /etc/modprobe.d/ when they are installed? I am asking this because there I have found the files "hackrf-blacklist.conf" and "rtl-sdr-blacklist.conf" and I would like to know where they came from. Thank you. Regards, Álvaro

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Transmitting Digital ATSC TV signals using Osmo-fl2k
by Chase Johnson 15 May '18

15 May '18

Hi all, I am new to Software Defined Radio and I was wondering if it was possible to broadcast a Digital ATSC TV channel using Osmo-fl2k ( https://osmocom.org/projects/osmo-fl2k/wiki/Osmo-fl2k). I am in need of a device that can do this for my work and didn't want to pay $1000+ for the equipment designed for this purpose. Thank you for your help, Chase Johnson -- Sent from an Apple Newton MessagePad 100 https://goo.gl/v82H1C

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Discerning FL2K devices with LDOs versus switching regulators
by Mac A. Cody 12 May '18

12 May '18

Greetings, In Steve Markgraf's slide presentation (http://people.osmocom.org/steve-m/fl2k_slides/osmo-fl2k.html), do slides 16 and 17 imply that some FL2K devices have LDO regulators while other using switching regulators? Obviously, the FL2K devices that have LDO regulators are preferred, due to fewer spurious RF emissions. How can one determine which FL2K devices have LDOs? Can an FL2K device be reworked to use LDO regulators? Thanks, Mac

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