Author: SM0TGU

Senaste nytt om Es’Hail-2 P4-A satelliten: Den ska placeras i en geostationär bana 25.5 degrees Öst och planerad uppskjutning är redan i december 2016. Täckningsområdet för oss radioamatörer beräknas bli från Brasilien till Thailand och även täckning för oss här i Sverige.

Es’hail 2 kommer att innehålla två icke-inverterande transpondrar på 2400 MHz och 10450 MHz. En 250 kHz linjär transponder för SSB/CW och en 8 MHz transponder för digitala experiment som tex. DVB amateur television.

Narrowband Linear transponder
2400.050 – 2400.300 MHz Uplink
10489.550 – 10489.800 MHz Downlink

Wideband digital transponder
2401.500 – 2409.500 MHz Uplink
10491.000 – 10499.000 MHz Downlink

Rekommenderad utrustning för markstation:
X-Band 10 GHz Downlink:
– 89 cm dishes in rainy areas at EOC like Brazil or Thailand
– 60 cm around coverage peak
– 75 cm dishes at peak -2dB
– NB: linear vertical polarisation
– WB: linear horizontal polarisation

S-Band 2.4 GHz NB-Uplink:
– narrow band modes like SSB, CW
– 5W nominal Uplink power (22.5 dBi antenna gain, 75cm dish)
– RHCP polarisation

S-Band 2.4 GHz WB-Uplink (DATV):
– wide band modes, DVB-S2
– peak EIRP of 53 dBW (2.4m dish and 100W) required
– RHCP polarisation

Uppdaterat:
Satelliterna kom ut som planerat men STMSat-1 har problem med sin sändare och har inte hörts.

Det kommer släppas ut en ny satellit från ISS på måndag den 16 maj (2016):

A Slow Scan TV (SSTV) CubeSat developed by students at Saint Thomas
More Cathedral School (STM) in Arlington, VA, is set to be deployed
from the International Space Station between 1400 and 1500 UT on May
16. For latest date/time check
https://twitter.com/STMSAT11.

STM is thought to be the first Elementary school to build their own
satellite, even Pre-Kindergarten, Kindergarten, and First Grade
students were involved in the project.

The satellite, a 1U CubeSat called STMSat-1, will transmit a SSTV
Robot36 mode signal on 437.800 MHz.

Middle School Students took the initiative to begin exploring how to
receive data from the CubeSat and formed a Ham Radio Club. There,
they learned the basics of operating a ham radio station and explored
Slow Scan Television as an option for receiving images once the
satellite is deployed.

How Did 400 Grade School Students Built A Nano-Satellite?
http://tinyurl.com/ANS136-NanoSat

Watch the CBS This Morning show report on the satellite
http://tinyurl.com/ANS136-CBS-MorningShow

STMSat-1
https://twitter.com/STMSAT11
https://www.facebook.com/stmsat1/
https://www.facebook.com/groups/491135804399695/
http://www.stmsat-1.org/

[ANS thanks AMSAT-UK for the above information]