Application » History » Version 30

HAENNIG, Gerald, 12/14/2015 12:11 PM

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{{toc}}
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h1. 4. Results
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This section explains how the Outdoor system has been installed and the results obtained measuring a real TV signal from a Satellite. 
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p=. !{width:300px}transrecv.jpg!
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Optical system (transmitter + fiber + receiver)
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h2. 4.1 Preparation
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The optical transmitter has been put in an hermetic box.
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p=. !{width:300px}installation.jpg!
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Hermetic box installed outdoors
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Its interface consists of :
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* The power supply plug to be connected to the mains ;
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* The optical fiber harness (2 fibers) : only the red fiber is actually connected to optical transmitter ; the black fiber is not used, it will enable to have a b ;
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* The type F coaxial cable to connect the Antenna Low Noise Block, LNB, to optical transmitter.
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Optical transmitter is set to :
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* To supply 18 V to LNB, which selects Horizontale polarization ;
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* To provide 0 kHz tone to LNB, which set its Local Oscillator to 9.75 GHz to transpose lower Ku Band from  10.7 to 11.7 GHz into IF Band.
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* This hermetic box has been mounted on Antenna mast. This Antenna is pointing to Astra 1KR/1L/1M/1N colocalized satellites on 19.2° East.
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h2. 4.2 Trials
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h3. 4.2.1 Inter Frequency Spectrum with Optical Link
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RF output from Optical receiver has been analyzed with Rohde & Schwartz FSV spectrum analyzer :
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_IF Band, 1 Channel (with Optical Link)_
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It is possible to distinguish several channels within the Inter Frequency, IF, band. There is a zoom on left side. The 3 dB channel bandwdith is 22 MHz.
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The power is about -32 dBm for the channel centered around 1141 MHz.
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p=. !{width:300px}rsz_tv_channel.png!
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_TV channel at 1141 MHz_
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h3. 4.2.2 Link Quality with Optical link
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Measurement setup based on TV, Tuner, IPRICOT SCB router with Optical Receiver (On screen : Einsfestival program on 10744 MHz Horizontal Polarization)
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First, optical link performance enables to have a good TV quality (for example, Einsfestival Plus on 10744H).
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Channel power and 3 dB Channel bandwidth have been checked with Spectrum Analyzer.
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More deeply, physical link quality has been assessed with the information provided by IPRICOT SCB router :
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* IPRICOT confirms that input signal is a QPSK modulation with Forward Error Correction Rate of 5/6 (RX_SIG & VITSYNC set to green). Moreover, IPRICOT is able to get the Frame Synchronization (FSYNC set to green) ;
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* Eb/No is reported by IPRICOT.
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This data has been compared with data from website like [www.lingsat.com] :
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p=. !{width:400px}table_channels.jpg!
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Summary Table
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p=. !{width:500px}IFSignal_994MHz.PNG!
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Channel Bandwidth & Power at 994 MHz (Ku channel @ 10744 MHz)
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p=. !{width:500px}rsz_ipr_sc.png!
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Physical link parameter at 10744 MHz
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|/2 Ku Channel [MHz]|/2 IF Channel [MHz]|_. TV|\2=. www.lingsat.com |\2=. Spectrum Analyzer|\2=. IPRICOT|
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|=. Channel|=. Physical Protocol|=. EIRP[dBW]|=. 3 dB CH BW [MHz]|=. CH Power [dBm]|=. Physical Protocol|=. Eb/No[dB]|
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10744H|994|Eins Plus|DVB-S QPSK 22 Msps 5/6||About 22|-31.94|DVB-S QPSK 22 Msps 5/6|7.7
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11244H|1494|Schau TV|DVB-S QPSK 22 Msps 5/6||About 22|-32.81|DVB-S QPSK 22 Msps 5/6|7.9