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INFOSAT C/Ku-Band Combifeed with Integrated Diseqc Switch Thomas Haring and Sylvain Oscul

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INFOSAT C/Ku-Band Combifeed with Integrated Diseqc Switch Thomas Haring and Sylvain Oscul TEST REPORT Satellite Reception INFOSAT C/Ku-Band Combifeed with Integrated DiSEqC Switch Thomas Haring and Sylvain Oscul We have often touched on the C-band subject in TELE-satellite magazine, sometimes with larger antennas and sometimes with smaller ones. One thing was always true: a Combifeed for the ▲ Included in the package: the Com- reception of C-band and Ku-band with integrated DiSEqC switch (to bination LNB with C and Ku-Band switch between bands) as well as 14/18-volt polarization switching LNB in one housing with feed and and 22Khz for switching between the low and high bands has not jumper cable for the built-in DiSEqC been tested by us up to this point. switch. The Combifeed is offered by fitted on an offset antenna. For INFOSAT in Bangkok, Thailand. our first test we opted to use While the C-band is not in all that a 1.2-meter antenna already much use anymore in Europe, installed on the roof of our it does offer some significant testing facility. Oddly enough, advantages in heavy downpours this antenna symbolizes the or high humidity compared to exact problem that DXer’s face the Ku-band. Receiving both in Europe: if you don’t have a bands with a single Combifeed backyard to call your own and does make quite a bit of sense; have no choice but to install you save the cost of having to your antennas on a steep roof or set up a second antenna. This on your balcony, it is often dif- actually gives us a reason to ficult to consider using a larger once again play around with the antenna. C-band here in Europe since all that is really involved is swap- Thanks to modern C-band and ping out the LNB. Ku-band satellites that transmit with more and more power, a The C/Ku-band feed delivered larger antenna may not neces- from Thailand was designed pri- sarily be required. A 1.2-meter marily for use on prime focus antenna already gives you antennas; although with a little access to thousands of channels ▲ modification ingenuity, it can be from around the world in the A look inside the feed open- ing: clearly recognizable is the dielectric that is necessary for reception of circularly polarized signals. Remove it and you have linear reception. Ku-band. But as numerous as the Ku-band availability really is, long-distance reception is typically achieved only with C- band and thanks to this new Combifeed, it is quite easy to retrofit your current system for C-band reception. Since offset antennas are not ▲ The INFOSAT C/Ku-LNBF can be seen here installed on a 1.8m para- bolic antenna. 46 TELE-satellite & Broadband — 08-09/2007 — www.TELE-satellite.com normally designed to handle C- Combifeed has a Ku-band recep- band feeds, a cable clip, available tion range of 10.7 to 12.75 GHz from any electrical installer, was using LOF (local oscillator fre- used to secure the Combifeed quency) values of 9.75 and 10.6 to the antenna. It’s not exactly GHz as well as a C-band range a professional solution, but it of 3.4 to 4.2 GHz with an LOF of is very effective and inexpen- 5.150 GHz. The specifications sive. The installation required also claim a gain of 65dB with a some dexterity but after several noise figure of 0.3 dB. attempts and some fine tuning adjustments, the feed was in Our first tests were aimed at the correct position. the C-band so we quickly set up the correct LOF and then had a The entire assembly including look at our spectrum analyzer. antenna motor was previously It indicated a strong signal aligned using a standard 40mm located at 3675R. We quickly Ku-band LNB; the less sensitive started a channel scan and found C-band should therefore be no numerous Russian channels problem. An Eycos S55.12PVR with plenty of signal strength. and the Prodig-5 signal analyzer According to the SatcoDX chan- ▲ TELE-satellite editor Thomas Haring aligns the C/ Ku-Band LNBF on a 1.2m offset antenna were used as receivers. With nel lists, South American chan- Rede Gospel on 4108R and RCN transponders were also receiv- great expectations, we turned nels with relatively high signal TV on 4016R; unfortunately, able. the antenna to the especially strength could be found on NSS this channel was encrypted. strong EXPRESS A1R C-band 806 at 40.5° west. A number of Even the ImpSat Package from We were less successful satellite at 40° east. MCPC and SCPC transponders Venezuela on 3880R could be when we tried NSS7 at 22° were receivable in sufficient received but without any bad west where we could only According to INFOSAT, the quality. Especially strong were weather reserves. A few other receive 3650R without any www.TELE-satellite.com — 08-09/2007 — TELE-satellite & Broadband 47 problems. On Atlantic Bird taking a closer look towards circularly polarized signals on antenna that happens to be 3 at 5° west we were able to the east. We stumbled across EUTELSAT W4 at 36° east could located at the SatcoDX station easily view 4157L but all the a few surprises: the (unfortu- be received in surprisingly good in Lyon, France. The Combifeed other transponders hovered nately encrypted) AFN pack- quality. is actually designed for this type around the threshold level of age on INTELSAT 906 at 64.2° of antenna. the receiver. Even though on east 4080L was identified by If you remove the dielec- the signal analyzer identified our receiver, the Hope Chan- tric in the feed, then standard And it didn’t take long for us a number of clearly recogniz- nel on INTELSAT 7 at 68.5° Ku-band H/V signals could be to be surprised by the recep- able peaks on the display, they east on 3516V was viewable, received effortlessly. tion results. In the C-band the were still not strong enough Bangla Vision could be seen on Combifeed, fitted with a 17K for actual reception. TELSTAR 10 at 76.5° east on The reasons for the dimin- LNB, could be compared with 4049H and the Express AM1 at ished performance of the Com- a more expensive 15K LNB. As Things looked a little better 40° east delivered a number of bifeed in the Ku-band are fairly our signal analyzer measure- on INTELSAT 907 at 27.5° west Russian channels with plenty of obvious. On the one hand, the ments showed, the Combifeed where we could receive three bad weather reserve. included feed was not designed actually performed better in transponders (3715R, 3831R for use on offset antennas so some frequencies than the and 4048R). On INTELSAT Up until now we were quite you really can’t blame the man- more expensive LNB. 801 at 31.5° west and INTEL- pleased with the results we had ufacturer for this shortfall. SAT 903 at 34.5° west, only gotten; now it was time to take As already seen in the tests one transponder on each was a look at Ku-band reception. On the other hand, the home- with an offset antenna, recep- receivable. made feed holder makes it tion in the Ku-band was some- The strong DTH positions rather difficult to perfectly align what different because the For all the others our antenna such as ASTRA at 19.2° east, the LNB in the focal point of the dielectric had to be removed. was simply too small. The HOTBIRD at 13° east, ASTRA2 antenna. And let’s not forget Then the reception results rep- normally strong EXPRESS A3 at 28.2° east or ASTRA 3A at that the C-band is much more resented those of a 1.5-meter satellite at 11° west could not 23.5° east could all be received forgiving compared to the Ku- antenna. be received with our 120cm without any problems. We band in terms of antenna align- antenna; the signals that we should mention at this point ment. Overall we can say that it saw on the spectrum analyzer that the INFOSAT C/Ku-band definitely pays to replace your were simply too weak. Combifeed is configured for So let’s switch things around current LNB with the INFOSAT reception of circularly polar- and mount the Combifeed on C/Ku-band Combifeed. Don’t The next step involved ized signals. With that said, the a real 1.8-meter parabolic expect miracles with signal Signal Measurements using the C/KU-Band Combifeed EXPRESS AM1 at 40° east, YAMAL 202 at 49° east, NSS 806 at 319.5° east (40.5° west), right-hand polarization left-hand polarization right-hand polarization Measurement with Standard LNB Measurement with Standard LNB Measurement with Standard LNB Measurement with C/Ku-Band Combifeed Measurement with C/Ku-Band Combifeed Measurement with C/Ku-Band Combifeed 48 TELE-satellite & Broadband — 08-09/2007 — www.TELE-satellite.com quality in the Ku-band, but for At the same time, it gives you the reception of the strong C a peek at the wonderful world and Ku-band positions, the of C-band even with a small Combifeed would be the perfect antenna without having to elim- choice. inate the Ku-band. TECHNIC DATA Model CKU Digital LNBF Function C/Ku-Band Combifeed Manufacturer Infosat Intertrade Co., Ltd., 46/22 Moo. 5, Tiwanon Road, Baanmai, Pakkred, Nonthaburi, Thailand Homepage www.infosats.com Email [email protected] Input Frequency Range Ku: 10.7~11.7 GHz/ 11.7~12.75 GHz linear/circular C: 3.4~4.2 GHz linear/circular L.O.
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