Few instructions were added

README.md

@@ -5,5 +5,48 @@ This repository contains "ADS-B Out" encoder for Tx-capable SDR hardware.
 It is currently written is architecture independent Python language and can be used as an add-on for existing
 open source "ADS-B In" solutions. One known good example is [Stratux](https://github.com/cyoung/stratux).
 
+## Disclaimer
 The source code is published for academic purpose only.
 
+## Instructions
+1. Execute *ADSB_Encoder.py* script with `<ICAO>` `<Latitude>` `<Longtitude>` `<Altitude>` arguments:
+```
+$ ADSB_Encoder.py  0xABCDEF 12.34 56.78 9999.0
+$ ls Samples.iq8s
+Samples.iq8s
+$
+```
+2. Make the raw signal file aligned to 256K buffer size:
+```
+$ dd if=Samples.iq8s of=Samples_256K.iq8s bs=4k seek=63
+1+0 records in
+1+0 records out
+4096 bytes (4.1 kB) copied, 0.00110421 s, 3.7 MB/s
+$
+```
+3. Transmit the signal into air:
+```
+$ hackrf_transfer -t Samples_256K.iq8s -f 868000000 -s 2000000 -x 10
+call hackrf_sample_rate_set(2000000 Hz/2.000 MHz)
+call hackrf_baseband_filter_bandwidth_set(1750000 Hz/1.750 MHz)
+call hackrf_set_freq(868000000 Hz/868.000 MHz)
+Stop with Ctrl-C
+ 0.5 MiB / 1.000 sec =  0.5 MiB/second
+
+User cancel, exiting...
+Total time: 1.00038 s
+hackrf_stop_tx() done
+hackrf_close() done
+hackrf_exit() done
+fclose(fd) done
+exit
+$
+```
+## Validation
+```
+$ sudo ./dump1090 --net --freq 868000000
+...
+```
+
+
+## References