|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|
I have change the LNB to new one here is the LO details
|LO 9.75 for 13V|
Satellite frequency For now is 10.706 - 9.75 = 0.956Mhz
|For Narrow 250Khz Band Polarization is 0 deg V|
|Add caption 0 Deg V Polarization|
|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 Up-link 10489.550 - 10489.800 MHz Down link
Wide band digital transponder 2401.500 - 2409.500 MHz Up-link 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.
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.
(For now the Elevation is 59.17 and Azimuth 350.43)
|Azimuth and Elevation from Johannesburg|
|Paper with a piece of string at back of Dish|
Here is the Paper details
Gpredict tracking details.Catalog number of Satellite is 43700
|It seems that the satellite is still rotating around the equator|
With the new TLE the Satellite has stabilized. at 59.17 Elevation and 350.43 Azimuth
|Elevation is now 59.17 and Azimuth 350.43|
The plan is to use my LimeSDR or hackrf 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
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
Azimuth direction finding http://www.satsig.net/ssazelm.htm