Changes between Version 3 and Version 4 of GettingStarted

Timestamp:

10/16/11 18:05:06 (20 months ago)

Author:

horiz0n

Comment:

--

GettingStarted

@@ -9 +9 @@
 
 {{{
-apt-get install build-essential libtool autoconf git-core pkg-config libfftw3-dev
+apt-get install build-essential libtool autoconf git-core pkg-config
 }}}
 
@@ -68 +68 @@
 
 There are several possible targets depending on your hardware:
- * uhd: For using any ettus hardware
- * usrp: To use the libusrp drivers for the USRP1 hardware
- * fcdp: To use the specific Fun Cube Dongle Pro drivers
+ * usrp: To use the libusrp drivers for the USRP1 hardware (gnuradio has to be compiled with gr-usrp enabled)
+ * uhd: For using any ettus hardware (see [http://code.ettus.com/redmine/ettus/projects/uhd/wiki UHD Wiki] for build instructions)
+ * fcd: To use the specific Fun Cube Dongle Pro drivers ([https://github.com/csete/gr-fcd gr-fcd] has to be installed)
 
 === Wireshark ===
@@ -79 +79 @@
 git clone git://git.osmocom.org/wireshark
 cd wireshark
+git checkout sylvain/gmr
 ./autogen.sh
 ./configure
@@ -91 +92 @@
 
 You need to capture samples off the air and of course "there's an app for that".
-For a first try the easier is to lookup a beam that match your geographic area by looking at ThurayaBeams and the associated map.
+For a first try the easier is to lookup a beam that match your geographic area by looking at Thuraya_Beams and the associated map.
 
 Depending on the target hw you selected, options might vary. Example below is for the UHD version. You can lookup the available options using {{{gmr_multi_rx -h}}} .
@@ -105 +106 @@
  * It can be pretty CPU intensive depending on the # of ARFCNs and how much they're spaced.
 
+==== [http://tetra.osmocom.org/trac/wiki/Funcube_Dongle FunCube Dongle] Build ====
+{{{
+./gmr_multi_rx --gain 30 --gmr1-dl 941 942 943
+}}}
+
+ * when receiving 3 consecutive channels, the middle channel will be distorted by the center peak caused by dc offset / iq imbalance
+ * when receiving 2 channels, each channel will have a small contribution of the center peak on the right or left side.
+ * best results may be achieved when receiving only one channel.
+
+==== Default USRP clock ====
+
+{{{
+./gmr_multi_rx --gain 45 --gmr1-dl 941 942 943
+}}}
+
+Only 75% of the master output rate will be used on the usrp/uhd builds, because of insufficient attenuation of the fpga channelizer at filter edges.
+
+==== Modified USRP clocks ====
+
+ * use --mcr to tell custom fpga frequency in Hz
+
+{{{
+./gmr_multi_rx --gain 45 --gmr1-dl 941 942 943 --mcr 52e6
+}}}
+
+ * mcr of 59.904e6 Hz is gmr1-friendly, thus allowing to save on interpolation stage
+
+{{{
+./gmr_multi_rx --gain 45 --gmr1-dl 941 942 943 --mcr 59.904e6
+}}}
+
 === Analyzing them ===
 
@@ -112 +144 @@
  * Run the {{{gmr_rx}}} compiled in the {{{src/}}} directory on the generated files:
   * {{{gmr1_rx 4 /tmp/gmr1-dl-977-sps93600.cfile}}}
- * View packets in wireshark
+ * View packets in wireshark using gmr1_bcch.* filters