Monday, February 22, 2016

Geostationary AMSAT Satellite (Phase 4) Spacecraft Covering the whole of Africa and Europe. (P4B)

I think this Satellite will open up one of the most exiting telecommunication capabilities for Africa and Europe.(P4A/B)

Coverage map
Phase 4 AMSAT planed

Qatar Satellite Company’s second satellite, Es’hailSat-2, will be placed in a geostationary orbit by a Space-X Falcon-9 rocket in November 2018. It will carry an AMSAT linear transponder as a secondary payload, giving Radio Amateurs access to a geostationary satellite for the first time.

Es’hailSat-2 will be “parked” 35 786 km above the equator at 25.5°East, nearly due North from Pretoria and Johannesburg (which are at 28°E).

Planned Frequency.

This satellite will have two linear transponders. (250 Khz and 8Mhz wide)
Narrow band transponder:
Up-links: 2400.050 - 2400.300 MHz modes SSB and CW. 5 Watt up link power,
Down links: 10489.550 - 10489.800 center 10 489.675 MHz. Vertical polarization.

Wide band transponder:
Up-links: 2401.500 - 2409.500 MHz
Down-links: 10491.000 -10499.000 MHz 

It will be so nice to have fixed antennas mounted on mast pointing to the satellite having continuous communication to any where in Africa and Europe. HI ;-) ;-)

Will have to start looking for some equipment and antennas for this one.

Link to Live websdr http://zr6aic.giga.co.za:8903


Here is a list of Equipment that should work for the P4A satellite.

X-Band 10 GHz Down link:




HailSat-2 Down link configuration.


Here is how I inject my power. The black typed lead has an short peas of coaxle cable with an Inductor on Center peas going to a 13V Power supply.
Power DC blocker and Power injection

Top coax go to LNB
Left Bottom go to SDR
Right Bottom has inductor on center going to 13V Power supply
Power Injection and DC isolation to SDR


For Narrow 250Khz Band Polarization is 0 deg V
Add caption 0 Deg V Polarization
Here is my 2.4Ghz Transmitting Antenna
2.4Ghz Tx Grid



Dish 60deg Elevation about 0 Deg Azimuth

2.4Ghz Transmitting Grid
View from back of two Antennas

Setting up Elevation and for best signal.




Here is an Spectrum of the 1Ghz to 1.7Ghz to see if the is a signal.
Signal at 27Deg So LNB works




I think the signal must look lie this



Linear transponder 2400.050 - 2400.300 MHz Uplink 10489.550 - 10489.800 MHz Down link
Wide band digital transponder 2401.500 - 2409.500 MHz Uplink 10491.000 - 10499.000 MHz Down link

My RTL dongle needs to listen on the following frequency

LO with 12V injection = lo - 10.489500Ghz + 1M to get center of bottom of the Spectrum on websdr
=9.75Ghz - 10.489500Ghz + 1Mhz = 7395Mhz (this is still debatable )
  • 89 cm dishes in rainy areas at EOC like Brazil or Thailand.
  • 60 cm around coverage peak,
  • 75 cm dishes at peak -2dB.
Narrow Band : linear vertical polarization.
Wide Band: linear horizontal polarization.

S-Band 2.4 GHz Narrow Band-Uplink:
    • Narrow band modes like SSB, CW
    • 5W nominal Uplink power (22.5 dBi antenna gain, 75cm dish)
    • RHCP polarization

S-Band 2.4 GHz Wide Band-Uplink (DATV):

    • Wide band modes, DVB-S2
    • Peak EIRP of 53 dBW (2.4m dish and 100W) required
    • RHCP polarization

Azimuth and Elevation details for Johannesburg South Africa.

Azimuth and Elevation from Johannesburg

2.4GHZ Transmitter.


The plan is to use my LimeSDR for transmitter with low pass filter and a Power AMP. Details to follow

2.4Ghz Transmitter Diagram





You can generate your own elevation and azimuth here http://www.satlex.us/en/azel_calc-params.html?satlo=&user_satlo=25.5&user_satlo_dir=E&location=-26.16%2C28.03&la=-26.16&lo=28.03&country_code=za&diam_w=75&diam_h=80

 REF:
Information http://amsat-uk.org/2015/07/03/phase-4-spacecraft-frequencies/
and here http://www.itu.int/en/ITU-R/space/workshops/2015-prague-small-sat/Presentations/Eshail-2.pdf
Spectrum Analizer for RTL https://github.com/pavels/spektrum/releases

Frequency list  http://frequencyplansatellites.altervista.org/Beacon-Telemetry_Europe-Africa-MiddleEast.html