It's Hail 2 (QO-100) It is a new generation satellite, which enables communication rádioamatérov. The main difference compared to other satellites, it is, that it is geostationary satellites with a height of ca.. 38-one thousand kilometers above the Earth's surface. Thereby it is achieving signal coverage from large parts of Asia through Africa and Europe to South America. The second specific feature of the used frequency. Narrowband transponder has uplink frequencies in the 13 cm (2,4GHz) and downlink band 3 cm (10,5 GHz).
You will read:
Downlink
Downlink is a classic concept with 85cm ofset parabolou and LNB Me L-107. The LNB has a PLL and frequency are among the more stable types. The recommendation for this model is from the government OM3CLS. The signal is then seduced into SDR RTL2832 USB the receiver of the new generation of TCXO. Declared as stability 0,5 PPM and scope 25 to 1760 MHz. A moth-eaten notebook Acer One of N270 Atom processor and 1GB memory. sufficient to HDSDR software, But mows SDRuno.
Uplink
Uplink is based on TM-455E 70cm transvertoru SG-Labs TR-2300, the output power of ca.. 2W is led into PW 24dBi parabolic slices. According to the indicator of adapting to transvertor PSV it is on the correct frequency. This antenna should have a dimension 107 x 61cm.
The said assembly to be made, including several QSO HS0AJ, OM3CLS, OM0MS, DG0OPK, or PA3FYM.
Setting
As the first was adjusted income. Big help in directing the dish is tracking beacon power to SDR receiver. Thus there is a problem to direct the antenna actually exactly. The signal from the LNB is very strong and it is suitable before entering the SDR receiver dampen. It can also be seen drift signal, But while I can not confirm whether the drift caused SDR receiver or LNB. After the experience of the LEO satellites type of AO-7, VO-52 and FO-29 but it is almost negligible.
Propagation delay
Negligible, however, signal delay. Since the satellite is at a distance of ca.. 38-one thousand kilometers, a signal must overcome twice the total distance and it shows. It is practically impossible to listen to your own signal, because the brain can not stack the delay in between, which gives information of the speech organs and that comes through the ears.
Set the transmission antenna is easier to, because the radiation pattern is wider. It is good to calculate the elevation and adjust with the square and then just gently adjust it later. team, that income is no longer functional, It can be set according to the broadcast antenna support. Me, the appearance still managed to improve signal strength 2dB.
Use the Power Amplifier
Some stations also use PA. Available are called. WiFi PA EP-AB003, which can be bought at a good price. Performance is achievable 3 up to 4W. Even so, the latter must be PA to be careful of the possible overheating.
Another possibility is the use of amplifiers provided for the professional transmitter.
Conclusion
QO-100 is a very interesting project disclosing a satellite operation of many of the radio. For me it is also 2 new band, for which I worked so far. I believe, they gradually come around to the improvement of the assembly and JN98av will be permanently present on the satelite. Try also!
