Spaun
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Spaun Presentation Transcript

  • 1. TEST REPORT Filter for SCR Distribution System • blocks unwanted carrier numbers in a SCR system • setting of the carrier number for the fix connected SCR receiver • greatly enhances reliability of a SCR distribution system • makes finding a faulty receiver settings very easy SPAUN Socket Filter for Single Cable System According to EN50494 78 TELE-audiovision International — The World‘s Largest Digital TV Trade Magazine — 01-02/2014 — www.TELE-audiovision.com www.TELE-audiovision.com — 01-02/2014 — TELE-audiovision International — 全球发行量最大的数字电视杂志 79
  • 2. TEST REPORT Filter for SCR Distribution System Installing a reliable and error-free SCR distribution system A Single Cable Router distribution system can feed up to 8 SCR satellite receivers, giving each of the receivers the full satellite IF signal with just one single Quattro LNB. How is it done? Switching between the 4 levels (Vertical and Horizontal, Low and High Band) is done by assigning each of the SCR receivers their unique carrier frequency to transmit the switching signals back to the LNB. So far so good, the system works perfectly as long as each SCR receiver is indeed using its assigned carrier frequency. But then someone tampers with his receiver, or buys a new receiver without contacting the system’s administrator, or does a re-set of his box. Eventually two SCR receivers in the system might end up using the same carrier frequency. The system becomes unstable and the installer is called in to find what’s wrong. In order to locate the source of the mixup checking all SCR receivers is required, but how to get access to the receivers, when people are not at home, or on holiday or the receiver can’t be accessed for any other reason? SPAUN invented a very easy solution to this problem: the SMA 8 F filter. This is a small box to be inserted between the subscriber’s socket and the IF input connector of the SCR receiver. It does not filter the signal spectrum but prevents a receiver from interfering with other receivers connected to the same single cable line. The filter has a 8 pole DIP-switch, which needs to be set to the carrier’s frequency number of the corresponding SCR receiver connected to this outlet. Now the filter passes only those single cable commands that refer to the correct carrier frequency. So, for example, if the end user accidentally reprograms his receiver to another carrier frequency which is assigned not to him but to his neighbor, the SMA 8 F will stop the improper commands generated by the receiver. In this way, it will block them from entering the line and interfering with another user’s reception. The same holds true 01-02/2014 SPAUN SMA 8 F Enables the creation of an error-tolerant SCR distribution system www.TELE-audiovision.com/14/01/spaun 80 TELE-audiovision International — The World‘s Largest Digital TV Trade Magazine — 01-02/2014 — www.TELE-audiovision.com if the end user reconfigures his receiver to a universal LNB rather than a single cable signal. Of course, the user who tampered with the settings of his receivers will loose the reception but not one of his neighbors will suffer. And it will be very easy for the installer to fix the situation, as he can easily check the SMA 8 Filter for the assigned carrier frequency number and then adjust the SCR receiver accordingly.
  • 3. In our TELE-audiovision test we checked performance of the SMA 8 Filter. After we confirmed that it was working as expected we then took some measurements to see if the satellite signal itself is not af- fected. As can be seen in our graphs, neither signal strength nor its quality were affected. So there are absolutely no penalties in using this device and at the same time this small filter improves the reliability of any SCR distribution system and makes it practically error free, since only the receiver which does not work needs to be checked and the installer can rest assured that the remaining parts of the system will be not affected ■ 82 TELE-audiovision International — The World‘s Largest Digital TV Trade Magazine — 01-02/2014 — www.TELE-audiovision.com at all by any wrong configurations anywhere in the SCR distribution system. This yet simple but so useful device invented by SPAUN greatly enhances any SCR distribution system for best performance.