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  1. 1. TEST REPORT Two Receivers on One Cable globalinvacom Stacker/ De-Stacker Two for the Price of One 0.33 PVR Twin Tuners, whether they are SD or HD boxes, are very high bine the two into one cable. The metal box with three satellite IF on everyone’s wish list but in the end most don’t buy their dream De-Stacker in the living room connections. Two of these con- receiver for reasons as simple as the lack of an input cable. Most separates the two signals again nections are for LNB1 and LNB2 apartments are only supplied with a single cable connection and so that the receiver can now while the third is connected to even in single family homes for many years it was never expected have two fully independent sat- the existing coax cable. that a modern satellite receiver would need two independent signal ellite signals connected to it. sources. Occasionally, with a little effort, you might be able to snake The LNB1 input is compatible a second cable through the walls into your living room but, more The Stacker is delivered from with the 950-2150 MHz frequency often than not, this is not possible. the factory in a stable, weather- range typical for DVB-S/DVB-S2 resistant plastic housing. It IF signals while the LNB2 input The receiver manufacturers came up with a partial solution by fitting should be installed as close covers the range from 47-2150 their boxes with a looped-through output from the first tuner so that as possible to the twin LNB or MHz. This expanded range lets both tuners could be connected to the same cable. But if you happen Quattro-Multiswitch; a cable tie you also connect a terrestrial to be using tuner #1 for a recording, the available channels on tuner is included to make it easy to antenna onto the second input. #2 are limited to the same polarization that is in use on tuner #1. install it directly on the satellite You really can’t have that much fun with your new Twin Tuner PVR antenna mast. Mounting holes The workmanship of the with this kind of set up. are also available for installation Stacker is quite good; it is prop- on a wall. erly labeled and should therefore The British company global- up with a simple yet ideal solu- prevent any possible mistakes invacom, better known to our tion. The Stacker and its coun- The heart of this discovery in connecting the cables. The regular readers because of their terpart, the De-Stacker, take is inside the housing: a small system is designed to work in new fiber optic LNB, decided to the signals close to an antenna address this problem and came or Quattro-Multiswitch and com- 08-09/2008 globalinvacom STACKER/DE-STACKER Easy installation, reliable technology and high-quality workmanship Stacker/ De-Stacker Set 52 TELE-satellite & Broadband — 08-09/2008 —
  2. 2. external temperatures rang- ing for us when we connected with a built-in amplifier and ing from -15°C to +40°C and is the Stacker to a 75cm antenna increases the LNB1 input level well protected from moisture. with Twin LNB pointed to by approximately 9 dB and the A separate power supply for ASTRA2 at 28.2°. LNB2 input by about 6 dB. This the Stacker is not needed; it should take care of most signal gets its power from the exist- The manufacturer recom- loss conditions. ing coax cable. mends using CT100 coax cable between the Stacker and De- But we weren’t going to let The De-Stacker is roughly Stacker, a suggestion that we the globalinvacom system 1/3 the size of the Stacker and naturally listened to for the get off that easy. We decided is also fitted with three satel- time being. to raise the difficulty rating lite IF connections. Since the by increasing the cable length De-Stacker would normally The distance between the between the Stacker/De- High-Band Astra2 28.2° east without Stacker only be used inside, away from Stacker and De-Stacker mod- Stacker to about 115 feet (35 the elements, it does not come ules was roughly 65 feet (20 meters). with a weather-proof hous- meters). To really put this ing. The connections are thus system through the ringers, But even this could not easily accessible. we selected four frequencies disturb the globalinvacom from each band at the start Stacker even though the man- The workmanship of the De- of the test with emphasis on ufacturer recommends that the Stacker is just as good as the frequencies that covered the De-Stacker Plus be used for Stacker with all of the connec- edges of the bands. cable lengths over 100 feet (30 tions nicely labeled. Should meters). The De-Stacker Plus you run into any problems, a As you can clearly see in guarantees interference-free service telephone number can Table #1, all four test frequen- reception with cable lengths cies were receivable at the De- up to 200 feet (60 meters). be found on the back. Stacker without any problems. In addition to connecting High-Band Astra2 28.2° east with Stacker/ Unlike the Stacker, the De- We were especially impressed De-Stacker LNB 1 Input that there was hardly any dif- this system to a twin LNB, it Stacker does need its own ference between the measured is also possible to connect the power supply and for this pur- signal before the test with- Stacker/De-Stacker to a Quat- pose that manufacturer has out the new globalinvacom tro-Multiswitch. To check the included a 20V power supply system and the measured validity of the manufacturers that uses less than 5W. signal with the new Stacker/ claim we linked the Stacker De-Stacker system. For all to two outputs from our 5/18 Even though the Stacker/ practical purposes this differ- multiswitch (four LNB inputs De-Stacker is for the most ence was negligible. for the Quattro LNB plus ter- part self-explanatory, Inva- restrial input) and as expected, com went the extra mile and Our tests also quickly showed the globalinvacom product included a very detailed user that the LNB1 connection was did not disappoint us. manual that takes the installa- tion and assembly and explains slightly better able to process signals compared to LNB2. But We do have to mention it step by step. though that the Stacker/De- High-Band Astra2 28.2° east with Stacker/ this is expected and the manu- De-Stacker LNB 2 Input facturer clearly states that in Stacker system is not designed to be used when DiSEqC sig- Everyday Use the specifications. The maxi- mum C/N difference between nals are present. DiSEqC sig- Several years ago we tested a pass-through signal and nals will not pass through the a similar system from another one that was routed through globalinvacom system; only manufacturer but because of the Stacker/De-Stacker was the 22 kHz switching signals some technical problems and a roughly 1.4 dB. For modern for low and high band will lack of sophistication, it never DTH satellites this is absolutely pass through as will the volt- really was able to penetrate age switching for polarization. no problem. Therefore, the Stacker/De- the market. Of course, this Stacker system can be used on made it all the more interest- The De-Stacker Plus comes these three applications: TELE-satellite World Download this report in other languages from the Internet: ― Reception of two satel- lites each with their own LNB Terrestrial Frequency Spectrum without Stacker/De-Stacker Arabic ‫ﺍﻟﻌﺮﺑﻴﺔ‬ ― Reception of one satellite Indonesian Indonesia Bulgarian Български using a twin LNB Czech Česky ― Reception of one satel- German Deutsch English English lite with a Quattro-LNB and Spanish Español multiswitch Farsi ‫ﻓﺎﺭﺳﻲ‬ French Français Greek Ελληνικά Croatian Hrvatski As we already mentioned, Italian Italiano the entire terrestrial frequency Hungarian Magyar Mandarin 中文 range can be handled by the Dutch Nederlands LNB2 connection. Figure 4 Polish Polski Portuguese Português shows the frequency spectrum Romanian Românesc with a direct connection of our Russian Русский Swedish Svenska TV Explorer II analyzer to the Turkish Türkçe multiswitch. Figure 5 shows Terrestrial Frequency Spectrum with Available online starting from 25 July 2008 the terrestrial signal through Stacker/De-Stacker 54 TELE-satellite & Broadband — 08-09/2008 —
  3. 3. Table 1: ASTRA2 Stacker LNB 1 Stacker LNB 2 without Stacker 11256V 59.8dBµV/CN 12.4 dB 61.0dBµV/CN 11.6 dB 62.2dBµV/CN 13.1 dB 10961H 59.5dBµV/CN 14.5 dB 63.3dBµV/CN 14.7 dB 64.5dBµV/CN 15.0 dB 12204V 66.0dBµV/CN 16.0 dB 66.0dBµV/CN 15.1 dB 68.7dBµV/CN 15.8 dB 12262H 54.1dBµV/CN 13.3 dB 64.5dBµV/CN 13.4 dB 66.0dBµV/CN 14.7 dB Signal comparison Stacker/De-Stacker System and direct cable connection the Stacker/De-Stacker system. Therefore we strongly rec- In addition to all of the DVB-T ommend that you use the cable channels, we were also able to suggested by the manufacturer receive the analog camera signal especially if a length of more from the main entrance of our than 33 feet (10 meters) is to be test lab without any problems used. and at nearly the same level (63 dBuV). How does the If you happen to have a wall Stacker/De- outlet, in most cases this can also be used as long as it can Stacker actually support frequencies up to 3850 MHz. The manufacturer recom- work? mends wall outlets from Global As the name suggests, the Euroframe and Euromod HQF. signals of a twin LNB or a mul- tiswitch are stacked on top of each other. In normal satellite Does it have to reception, the LNB converts the be CT100 coax incoming satellite signals to the 950-2150 MHz so that they can cable? be efficiently carried by a coax Up until now, we only used cable. The Stacker does noth- CT100 cable between the ing more than transfer the LNB2 Stacker and De-Stacker as rec- signals in the 47-2150 MHz range ommended by the manufac- while taking the LNB1 input sig- turer. But in reality, most end nals and converting them to the users already have cable that 2650 to 3850 MHz range. The is of lesser quality. This was Stacker essentially expands the reason enough for us to test this useable frequency range. as well. The job of the De-Stacker is We happened to find a roll of to take the higher frequency sig- older coax cable gathering dust nals that are now on the LNB1 in our storeroom and decided to input and reconvert them such replace the high quality coax with this older cable. As long as the that both De-Stacker outputs cable lengths were fairly short, are in the 950-2150 MHz range we did not encounter any prob- and thus compatible with DVB- lems but, as the cable lengths S/DVB-S2 receivers. A built-in increased, the more problematic amplifier makes up for any signal the transmission became. loss that may have occurred. 56 TELE-satellite & Broadband — 08-09/2008 —
  4. 4. Stacker/De-Stacker Applications Expert Opinion + Reception of two satellites each with their own LNB The globalinvacom Stacker/De-Stacker passed all of our tests quite convincingly. If high quality cable is used, there should be no problems using cable lengths of 100 feet (30 meters) or more; the De-Stacker Plus model according to the manu- Thomas Haring facturer can do 200 feet (60 meters) or more. The TELE-satellite installation is simple and its workmanship is quite Test Center Austria good. Even if you don’t take the manufacturer up on the recommended cabling, the Stacker/De-Stacker still func- tioned without any problems. Receiver with - 2 IF-inputs PVRs can be used only with Twin LNBs or Quattro-Multi- switches, that is, for a single satellite TECHNIC DATA Manufacturer globalinvacom Winterdale Manor, Southminster Road Althorne, Essex, CM3 6BX, UK Tel +44 (0)1621 743440 Email Reception of one satellite Model Stacker/De-Stacker with a Twin LNB Function Transmission of 2 separate signals via one coax cable Input Frequency Range Stacker LNB 1 950-2150 MHz Input Frequency Range Stacker LNB 2 47-2150 MHz Output Frequency Range Stacker 47-3850 MHz Signal Loss Stacker LNB 1 0 dB Signal Loss Stacker LNB 2 -2 dB Power Usage Stacker supplied through De-Stacker Dimensions Stacker 155x122x35mm PVR Receiver Operating Temperature Stacker -15 bis +40 °C Input Frequency Range De-Stacker 37-3850 MHz Output Frequency Range De-Stacker LNB 1 950-2150 MHz Output Frequency Range De-Stacker LNB 2 47-2150 MHz Signal Loss De-Stacker LNB 1 0 dB (+9 dB De-Stacker Plus) Signal Loss De-Stacker LNB 2 -2 dB (+6 dB De-Stacker Plus) Power Supply External AC Adapter Dimensions 116x90x32mm Min. Input Level up to 100 feet (30m) +68 dBµV Min. Input Level up to 200 feet (60m) +70 dBµV Max. Input Level at LNB 1 Input: +95 dBµV Reception of one satellite with a Quattro-LNB and ENERGY Multiswitch DIAGRAM Apparent Power PVR Receiver Active Power Mode Apparent Active Factor Active 6W 2W 0.33 After turning it on, the De-Stacker’s power usage remains constant. Switch- ing operations in the De-Stacker do not affect its energy usage. — 08-09/2008 — TELE-satellite & Broadband 57