[amsat-bb] First Demo of ground-based LEILA-2 for the NB transponder

[Peter Guelzow]

First Demo of ground-based LEILA-2 for the NB transponder
====================================================

the first geostationary P4-A satellite Es'hail-2 will carry two amateur
radio transponders:

- a Narrowband (NB) transponder with 250 kHz bandwidth and
- a Wideband   (WB) transponder with 8 MHz bandwidth for Digital Amateur
Television (DATV, DVB-S2 standard)

The NB transponder is a bent-pipe, non-inverting, linear transponder
with AGC.


A LEILA-2 system, similar to LEILA flown on AMSAT OSCAR-40 (P3-D) will
be used for Traffic Control and Telemetry Beacons.
The mayor difference is, that this is a ground-based system which will
be installed at the Es'hailSat Satellite Control Center (SCC) near Doha
in Qatar.

LEILA-2 will analyze the downlink power levels in the passband of the
NB-transponder and automatically generate a Siren to remark users to
decrease their uplink power.

LEILA-2 is a joint development of AMSAT-DL's Achim Vollhardt DH2VA and
AMSAT-UK's Howard Long G6LVB.

LEILA is an german acronym for "LEIstungs Limit Anzeige", which means:  
Power Limit Indicator


The following video gives a first insight to the Es'hail-2 LEILA-2
hardware concept: https://youtu.be/v-9jVw-pK0A


73s  Peter DB2OS, AMSAT-DL