Official satellite name: Es'hail-2. The radio amateurs (AMSAT) designated it Qatar Oscar 100 (QO-100).
Satellite built by Mitsubishi Electric Corporation. Weight: 5300 kg
Launched: 15-November-2018 by SpaceX from Cape Canaveral, Florida, USA.
Amateur radio service was opened on 14-February-2019.
Orbit: Geostationary. Es'hail-2 orbits 35,786 km above the Earth's surface at Equator, and it follows the Earth's rotation. The satellite appears to stand still in the sky. My uplink- and downlink antennas are pointed towards the satellite, and they are mounted permanently (no rotator). The distance from my house in Holstebro, Denmark to Es'hail-2 is 39,171 km.
Transponders: NarrowBand (250 kHz bandwidth), and WideBand (8 MHz bandwidth).
Web-SDR for NB transponder: https://eshail.batc.org.uk/nb/
Web-SDR for WB transponder: https://eshail.batc.org.uk/wb/
More info: https://amsat-dl.org/eshail-2-amsat-phase-4-a
10 GHz downlink:
Receive chain for QO-100.
The signal from the satellite's narrowband transponder is received on 10.489 GHz. This signal is mixed with the local oscillator (9.75 GHz) in the LNB, and the IF frequency is 739 MHz. The IF is forwarded to the SDR dongle where it is decoded and displayed. The Bias-T supplies power to the LNB while being transparent to RF.
Triax offset dish with LNB.
I found the Bias-T on ebay.com. It supplies 12 V 100 mA to the LNB via the coax cable, and keeps 12 V away from the SDR.
The receiver is an SDR dongle from rtl-sdr.com. It is tuned to 739 MHz (NB transponder). The SDR software on the computer is SDR sharp (SDR#).
Desktop PC running Windows 10 (64 bit).
CPU is Quad-core i5-2400 at 3.1 GHz.
RAM is 4 Gb.
Transmit chain for QO-100.
Yaesu FT-847 transmits on 432 MHz. The transverter converts the signal from 432 MHz to 2400 MHz at 2 W. The signal is then radiated towards the satellite by a helix antenna.
Yaesu FT-847 transceiver.
My VHF/UHF transceiver Yaesu FT-847 is used for transmitting on 432 MHz. The PSU is a Kenwood PS-30.
13 cm transverter.
I choose this transverter because:
13 cm helix antenna.
|13 cm antenna|
I'm using a 21-turns helix antenna for the uplink. The product name is Helix-13 and I purchased it 10 years ago at wimo.com. The antenna gain is about 14 dB. Wave polarization is RHCP (Right Hand Circular Polarization). The antenna is pointed directly at the satellite in the sky.
Written by OZ1BXM Lars Petersen 24-April-2019