You can roughly tune in simply by looking at the The right neighborhood, then the FFT waterfall plot in GQRX visually shows you Pretty much all the LAPDįrequencies are in the 484MHz range or the 506MHz range. So instead of the commandline tools, I ended up GQRX. This very hard, so this could very well be my fault. Hardware inaccuracy, but I still wasn't able to successfully tune into theįrequencies, as defined in the LAPD channel list linked above. There exists an RTL-SDR calibration tool to compensate for the RTL-SDR is a cheap device, and its tuning inaccuracy alone is enough Tuning is sensitive, and small tuning errors make you miss the signal you wantĮntirely. Ran into was that we're tuning into a relatively narrow-band signal, so the I'd prefer to use theĬommandline rtl_sdr or rtl_fm from the rtl-sdr Debian package. There are several basic tools one can use for this. Gcc -O2 -Wall -o dsd dsd_main.o dsd_symbol.o dsd_dibit.o dsd_frame_sync.o dsd_file.o dsd_audio.o dsd_serial.o dsd_frame.o dsd_mbe.o dsd_upsample.o p25p1_hdu.o p25p1_ldu1.o p25p1_ldu2.o p25p1_tdulc.o p25_lcw.o x2tdma_voice.o x2tdma_data.o dstar.o nxdn_voice.o nxdn_data.o dmr_voice.o dmr_data.o provoice.o -L/usr/local/lib -lm /tmp/mbelib/build/libmbe.a HEAD is now at 5d147c9 version perl -p -i -e 's' make Statically-linked version so that we don't need to mess with git clone cd git tag git reset -hard v1.6.0 The Makefile to find and use the library we just built, and to use the HEAD is now at 316bab6 Bump version to mkdir cd cmake make We check out the code, roll bakc to the latest tag and git clone cd git tag git reset -hard v1.2.5
It's not in Debian, so we have to build it. The core RTL-SDR libraries, GNU Radio and UI tools such as GQRX are already inĭebian, so getting them is trivial.
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