eshailsat2

Scripts and flowgraphs for the Es'hailsat-2 amateur transponder

Included are:

beacongen.py

A Python script for generating wav files containing a CW beacon, specified by an input string. Basic pulseshaping is used to remove key clicks.

beacontrack.grc

A GNU Radio flowgraph for receiving the QO-100 / Es'hailsat-2 narrowband amateur transponder and performing phaselocking to the PSK400 beacon for automatic LNB drift correction

beacontrack_gqrx_airspy.grc

GNU radio flow, allowing to combine drift correction with convenience of GQRX as SDR receiver. It has been tested with Airspy Mini running at 3 MSPS with 8x decimation (375ksps output).

Usage:

1. Create new fifo object - execute mkfifo /tmp/gqrx_fifo command in linux terminal.
2. Start gnuradio-companion, open beacontrack_gqrx.grc flow and run it using "Play" button or F6 key.
3. Start GQRX and select Complex Sampled (IQ) File as input device. Provide the following settings:
4. Start reception in GQRX using "Play" button or ctrl-D.
5. You should see both gqrx and grc workflow running.

beacontrack_gqrx_rtlsdr.grc

Input osmocom block is using rtl=0 as input string. Sample rate is 1.5M with 4x decimation. Use Frequency adjustment slider to move upper beacon about 110 kHz above center frequency. Rest of instructions - same as above.

eshailuplinkgen.grc

A GNU Radio flowgraph for generating an USB signal at 2.4 GHz for uplinking to the QO-100 / Es'hailsat-2 narrowband amateur transponder. Uses Controlled Envelope SSB blocks from https://github.com/drmpeg/gr-cessb