There were more than a few stations that could have benefitted from that on Field Day... heard AO-7 jump to mode A twice from being hammered too hard.
George, KA3HSW
----- Original Message ----- From: "Peter Guelzow" [email protected] To: "amsat forum" [email protected]; "AMSAT-BB" [email protected] Sent: Sunday, June 26, 2016 5:43 AM Subject: [amsat-bb] First Demo of ground-based LEILA-2 for the NB transponder
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
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