Can someone explain in more detail the command-line arguments for gain and AGC in dump1090 (V1.3)?
Is the “gain” argument independent of “enable-agc”? From what I understand, the AGC is enabled by default (for RSP), but doesn’t seem to be a way to turn it off, unless perhaps the “gain” setting over-rides it.
Also, there doesn’t appear to be a “help.txt” as in previous versions that contained all command-line parameters. So is a complete list available anywhere for V1.3?
Type in “dump1090 --help”
I don’t have that installed, for dump1090-fa you get this answer:
-----------------------------------------------------------------------------
| dump1090 ModeS Receiver dump1090-fa 3.6.2 |
| build options: ENABLE_RTLSDR ENABLE_BLADERF SC16Q11_TABLE_BITS=8 |
-----------------------------------------------------------------------------
--device-type <type> Select SDR type (default: rtlsdr)
rtlsdr-specific options (use with --device-type rtlsdr)
--device <index|serial> select device by index or serial number
--enable-agc enable digital AGC (not tuner AGC!)
--ppm <correction> set oscillator frequency correction in PPM
--direct <0|1|2> set direct sampling mode
bladeRF-specific options (use with --device-type bladerf)
--device <ident> select device by bladeRF 'device identifier'
--bladerf-fpga <path> use alternative FPGA bitstream ('' to disable FPGA load)
--bladerf-decimation <N> assume FPGA decimates by a factor of N
--bladerf-bandwidth <hz> set LPF bandwidth ('bypass' to bypass the LPF)
ifile-specific options (use with --ifile)
--ifile <path> read samples from given file ('-' for stdin)
--iformat <type> set sample format (UC8, SC16, SC16Q11)
--throttle process samples at the original capture speed
Common options
--gain <db> Set gain (default: max gain. Use -10 for auto-gain)
--freq <hz> Set frequency (default: 1090 Mhz)
--interactive Interactive mode refreshing data on screen. Implies --throttle
--interactive-ttl <sec> Remove from list if idle for <sec> (default: 60)
--raw Show only messages hex values
--net Enable networking
--modeac Enable decoding of SSR Modes 3/A & 3/C
--no-modeac-auto Don't enable Mode A/C if requested by a Beast connection
--net-only Enable just networking, no RTL device or file used
--net-bind-address <ip> IP address to bind to (default: Any; Use 127.0.0.1 for private)
--net-ri-port <ports> TCP raw input listen ports (default: 30001)
--net-ro-port <ports> TCP raw output listen ports (default: 30002)
--net-sbs-port <ports> TCP BaseStation output listen ports (default: 30003)
--net-bi-port <ports> TCP Beast input listen ports (default: 30004,30104)
--net-bo-port <ports> TCP Beast output listen ports (default: 30005)
--net-ro-size <size> TCP output minimum size (default: 0)
--net-ro-interval <rate> TCP output memory flush rate in seconds (default: 0)
--net-heartbeat <rate> TCP heartbeat rate in seconds (default: 60 sec; 0 to disable)
--net-buffer <n> TCP buffer size 64Kb * (2^n) (default: n=0, 64Kb)
--net-verbatim Do not apply CRC corrections to messages we forward; send unchanged
--forward-mlat Allow forwarding of received mlat results to output ports
--lat <latitude> Reference/receiver latitude for surface posn (opt)
--lon <longitude> Reference/receiver longitude for surface posn (opt)
--max-range <distance> Absolute maximum range for position decoding (in nm, default: 300)
--fix Enable single-bits error correction using CRC
--no-fix Disable single-bits error correction using CRC
--no-crc-check Disable messages with broken CRC (discouraged)
--mlat display raw messages in Beast ascii mode
--stats With --ifile print stats at exit. No other output
--stats-range Collect/show range histogram
--stats-every <seconds> Show and reset stats every <seconds> seconds
--onlyaddr Show only ICAO addresses (testing purposes)
--metric Use metric units (meters, km/h, ...)
--gnss Show altitudes as HAE/GNSS (with H suffix) when available
--snip <level> Strip IQ file removing samples < level
--debug <flags> Debug mode (verbose), see README for details
--quiet Disable output to stdout. Use for daemon applications
--show-only <addr> Show only messages from the given ICAO on stdout
--write-json <dir> Periodically write json output to <dir> (for serving by a separate webserver)
--write-json-every <t> Write json output every t seconds (default 1)
--json-location-accuracy <n> Accuracy of receiver location in json metadata: 0=no location, 1=approximate, 2=exact
--dcfilter Apply a 1Hz DC filter to input data (requires more CPU)
--help Show this help
Debug mode flags: d = Log frames decoded with errors
D = Log frames decoded with zero errors
c = Log frames with bad CRC
C = Log frames with good CRC
p = Log frames with bad preamble
n = Log network debugging info
j = Log frames to frames.js, loadable by debug.html
Yes, using the SDRPlay version . . . release V1.3 with RSP1.
It works very well, although I would like to be able to tweak the command line parameters.
I’m about 40 miles south-east of Chicago . . . I typically see about 150 aircraft, with max range of about 225 miles.
Yesterday evening Sunday (perhaps the busiest time of week here) I was tracking 205 aircraft, farthest craft was 232 miles out.