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ARTICLE "Multi beam antenna Wavefrontier TOROIDAL-90" When we introduced the Wavefrontier TOROIDAL-55 in a previous edition of TELE-satellite we found that it met almost all demands of our test crew. The only points we criticized in the pre-volume-production test model was the small pole fixture size of 38 mm and an LNB mounting rail that didn't seem to be very strong. After all, with an antenna like this you should be able to receive as many as 10 satellites having an EIRP of approximately 50 dBW at your site - without a motor! In the Ku-band, a 90-cm reflector leaves almost nothing to be desired these days, given the number of powerful DTH satellites that populate the orbit. So it was with great expectations that we installed and tested the TOROIDAL-90.
The shape of a regular offset or prime focus dish results in an exactly defined focal point. If three LNBs are mounted on a single dish, only one can be in the focal point, the other two have to be offset. A toroidal antenna, on the other hand, has a focal line rather than a focal point. Each LNB can therefore enjoy the same level of amplification.
The main reflector measures only 96.7 cm by 108.6 cm and the sub reflector is 36.1 cm by 83.6 cm - and they effectively replace several single 90-cm dishes with a gain of 40.1 dB at 0¡Æ azimuth and 39.2 dB at 20¡Æ azimuth (at 12.5 GHz).
Installation
Assembling the antenna was extremely easy. The assembly manual that comes with the package guides you through the process step by step. Also, the new model now has a 60 mm pole fixing.
Two robust support arms lead to the front from behind the main reflector and carry the sub reflector. A slightly angled rail is fixed between the two reflectors - this is where the LNBs are to be mounted. To raise it up, it is mounted on plastic bases that are screwed to the support arm from below. The fixing of the rail on the bases is now very robust, unlike that of the TOROIDAL-55.
Antenna alignment
At our test location (48¡Æ north/12¡Æ east) HOTBIRD was selected as the central satellite for our second test, while to the left and to the right, converters for ASTRA 1 and 2, KOPERNIKUS-3, EUTELSAT W1 and W2, SIRIUS, THOR, AMOS and TELECOM 2 were set up. The azimuth scale on the LNB rail is almost identical to the real angular separation of the satellites in degrees. This way the individual positions for the LNBs can be identified in only minutes. After setting the basic elevation the antenna only had to be carefully aligned towards the south until the antenna signal meter detected the best signal from HOTBIRD. The remaining 9 satellites were also aligned perfectly and no correction was required.
The C/N values for ASTRA and HOTBIRD ranged between 10 and 12 dB, depending on the transponder. SIRIUS is lower in southern Germany, which means we had to accept a C/N level of 9 dB. TELECOM 2, THOR and AMOS came in with a C/N level of 10 dB again. For home reception these are acceptable results. The further you look for satellites to the east or to the west from your own position, the lower the elevation angles for the individual satellite become, which normally means that TURKSAT, for example, could only be paired with EUROPE*STAR. Not so with the TOROIDAL-90, because the dish is tilted in itself in order to accommodate the steep elevation change so that all satellites positioned within the 50¡Æ azimuth range can be received. As soon as we had installed 8 LNB's and performed an automatic search we found that the 3000-channel memory of our satellite receiver was too small to retain all the receivable channels.
Conclusion
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WIDEVISION NASHVILLE, TENN, Korea-based WaveFrontier gave SBCA showgoers a glimpse of its new satellite dish design that will enable reception from multiple satellite orbital slots at one time. The Toroidal 55 and 90 antennas will enable reception from DBS Ku-band satellite, and could, for example, allow a DISH network customer to access most of that provider's services without the need for a second dish. Echostar CEO Charlie Ergen popped in during the WaveFrontier press conference to get the story for himself. No plans for shipping or pricing were announced. ![]() |
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DISH Creates Waves with "I Like 9" NASHVILLE, Tenn., - DISH Network's newest fall promotion took center stage for the DBS company at this year's SBCA satellite convention.
At its booth and throughout its presence at the show, EchoStar was hyping its "I Like 9" campaign, in which consumers who purchase a system for $199 can get DISH Network programming for $9 a month. The latest approach is a change for Charlie Ergen's satellite TV company, which prior to the new effort was known for giving away satellite systems.
During his chat with the press Thursday, the chairman and CEO talked about DISH Network's HDTV slate, including the recent acquisition of CBS high-definition programming. Said Ergen, "We think people will want HDTV once they see it."
EchoStar personnel showed off the latest HDTV programming from CBS, recently made available through an agreement the network scored with EchoStar. CBS executive vice president Marty Franks was at the press event, promoting the network's deal with the DBS provider. Through the partnership, DISH subscribers residing in TV markets with a CBS-owned station can access the special HDTV feeds.
The company also displayed its latest set-top boxes, including the Pro 501 PVR system and the developing DISH Pro 721. In addition, Ergen praised the StarBand high-speed Internet service, and said the offering "is going to be here for a long time." Recently, EchoStar took a controlling stake in StarBand.
Ergen didn't limit his presence to just the EchoStar press conference. He was found mingling with delegates throughout the Opryland Hotel, site of this year's convention. Ergen also showed up for a press conference held by WaveFrontier, asking questions about the company's multi-lnb antenna and talking with WaveFrontier personnel.
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"WAVEFRONTIER'S TOROIDAL55 Long-Term Test" This antenna had already caught the attention of the industry with our first report (TELE-satellite, 04-05/2001).
The antenna's manufacturer, Wavefrontier, has all along been promising reception of up to 10 satellites with just one antenna, and all without a motor.
The shape of a normal offset or prime focus dish provides for a single focal point. Even if only three LNB's were used, only one of them would sit right in the focal point, the other two would be offset to the side.
The result would be reduced gain for the two offset LNB's. A Toroidal antenna on the other hand provides a focal line rather than a focal point. Every LNB in this line would receive the same gain.
The 53.2cm x 66.8cm main reflector and the 25.3cm x 49.7cm sub-reflector should be able to replace multiple 55cm single antennas that have gains of 35dB at 12.5 GHz.
The Installation
The TOROIDAL 55 that the TSI team received was one of the first models from the manufacturer.
A box that was not all that big managed to contain all the parts of the antenna.
The only things missing were the LNB and a proper DiSEqC switch, and those were supplied by Sat-Shop Munich. And since the TSI test team believes in using only in the highest quality LNB's, the new Cambridge models were selected.
That this choice later turned out to be the wrong one, had nothing to do with the converters quality, but its shape instead.
The assembly of the antenna was actually quite easy even though the instructions were missing.
Unfortunately, the manufacturer wasn't thinking about your local satellite accessory dealer.
Who today has antenna legs with a diameter of 38mm? It would have been better to have a more heavy-duty antenna mast.
Two support arms run from the back of the main reflector to the front and support the sub-reflector.
Between the two reflectors runs a slightly curved bar with gradient markings on which the LNB's are mounted.
This bar is mounted slightly above the support arms via a pair of plastic standoffs.
These plastic standoffs are screwed into the support arms from underneath.
The bar itself is mounted to the standoffs with simple screws that go into holes in the plastic.
No nuts are needed. Doing this the first time doesn't present any problems. But if for some reason this set up has to be taken apart and re-assembled, the holes will most likely be worn out and will have to be filled.
A metal mount would have been much better.
Another problem might be long-length LNB's (like Philips or Cambridge).
The two support arms behind the main reflector must have a convex shape towards the back.
As luck would have it, the two LNB's for ASTRA 1 and EUTELSAT W3 ended up right in front of this arm and therefore could not be properly mounted.
Switching to much smaller L-shaped LNB's solved that problem. Unfortunately, only four LNB mounts were provided with this first model.
So for our tests we had to improvise a little and occasionally re-position the individual converters.
Antenna Alignment
An included graphic showed all the satellites (for Central Europe, in our case) with an accurate indication of those satellites that can be received by one of these 55cm antennas and those that
can't. Also included was a clear strip that when placed over the graphic identified those satellites that were receivable in this region.
This is where the Toroidal antenna's characteristics become recognizable.
Across the antennas reception range, only those satellites that fall within a 3¡Æ elevation tolerance can be received.
This clearly puts a limit on those 10 satellites the manufacturer states can be received.
In our test location there were theoretically 10 visible positions between ASTRA 2 and TELECOM 2A.
This covered a range of 36¡Æ (40¡Æ is possible) although for one thing the weaker satellites were difficult to receive or couldn't be received at all and for another it assumes that the 10 satellites would be within 3¡Æ.
The LNB mounts were allocated with 3¡Æ of spacing but the endcaps on the LNB's are normally somewhat larger and would probably get in the way of each other at this spacing. 4¡Æ spacing is more realistic.
  In our test area (48¡ÆN / 12¡ÆW) the HOTBIRD satellite was chosen as the middle point for the first test with the converters for ASTRA 1, SIRIUS and TELECOM 2 installed to the left and right of this point.
The LNB bar comes marked with azimuth intervals in degrees that correspond to the actual satellite offsets.
Thus it only takes minutes to find the correct positions for the individual LNB's.
After the antennas elevation was set up, the only thing left was careful alignment towards the south until the antenna measurement unit showed a usable signal from HOTBIRD.
The remaining three satellites were also optimally aligned and no correction was needed.
The C/N values for ASTRA and HOTBIRD fell between 9 and 10 dB - depending on the transponder.
In southern Germany SIRIUS' signal is not as strong and thus you had to be satisfied with a C/N of 8 dB.
With TELECOM 2A it was once again 9 dB.
For your own individual reception, these values are good enough. In another test, the LNB's were repositioned so that now AMOS, TELECOM 2A, SIRIUS and TELSTAR 12 could be received.
TELSTAR was not listed as a receivable satellite, but in our test area it was still receivable with its C/N of 7 dB.
The values of the other satellites fluctuated between 8 and 9 dB.
As you start to move further east or west, the elevation angles of the individual satellites begin to drop off more quickly.
The TOROIDAL 55 easily adapts to this. The dish itself can be rotated to adjust to this elevation curve making it possible to receive all those strong satellites that are positioned within its 40¡Æ range.
Conclusion
The TOROIDAL 55 is a true innovation.
If you're looking to tune into those DTH satellites that lie just east and west of your southern orbital position, you might want to reconsider that motorized system.
LNB's cost very little today making these two types of systems very similar when it comes to price.
With the TOROIDAL 55 you don't have to worry about any mechanical problems.
Even more important is the lack of any motor noise.
And should a new satellite be launched into orbit, only about 20 Euros for a new LNB puts this new bird within reach.
Of course for all of this to work you need a proper DiSEqC switch.
The only drawbacks are the need to use L-shaped LNB's and the use of somewhat unstable plastic pieces.
The manufacturer has promised that they are working on this issue.
Unfortunately at press time we had not yet seen the TOROIDAL 90.
This version is supposed to offer a somewhat larger azimuth range with a gain of 39.1 dB at 12.5 GHz.
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"10 Satellites With Only One Antenna" When N. Cassegrain first intro-duced his sub-reflector system in France, for which he was also later named, he probably never expected that a single antenna could be used for multi-satellite reception.
The classic Cas-segrain antenna works with a hyperbolic sub-reflector that is designed to match with the main parabolic reflector of the dish.
This arrangement can provide for an additional 10 to 12% increase in gain over several variations to this technique with the most popular being the Grego-rian antenna.
A new and extremely efficient version of this Gregorian variant has emerged from Korea.
The term ¡°variant¡± is really not cor-rect since the basic formula used in making this antenna is somewhat different.
Wave-frontier¡¯s TOROIDAL Dual Reflector does not work according to your basic parabolic for-mulas.
This system uses a convex/concave sub-reflector and doesn¡¯t just have a single focal point like its parabolic cousin.
Instead of a focal point, its toroidal design actually creates a focal line across the surface of the reflector allowing multiple LNB¡¯s to be installed on one dish antenna.
At this point you might say that an offset antenna can do this too.
This is true, but with a parabolic dish only one LNB sits in the focal point of the dish.
The other LNB¡¯s have to live with the weaker signals that exist off to the side of the focal point.
TOROIDAL55
It is the smaller model that we are pre-senting here.
Its larger cousin, the TOROIDAL90, is undergoing long-term testing and a detailed test report will appear in the next issue of TELE-satellite International.
Since the model 55 can handle up to 10 LNB¡¯s, you automatically expect there to be a large dish to go along with it. Well, this is not true.
The dish¡¯ main reflector measures 53.2cm x 66.8cm and its sub-reflector measures 49.7cm x 25.3cm.
This relatively small set-up can take the place or 10 different single 55cm antennas allowing the TOROIDAL55 to be used with almost all DTH (Direct-to-Home) satellites with EIRP¡¯s greater than 50 dBW.
For analog signals from some satellites, 55cm might not be enough, but for reception of digital signals, this size will work for most satellites.
In our tests on KOREASAT 2, KOREASAT 3, BAST 1A, JCSAT 3, JCAST 4, HOTBIRD, ASTRA 1 and 2 and AMOS (spot) C/N values of 8 to 10 dB were measured - acceptable for DTH reception.
A maximum of 10 LNB¡¯s can be installed across an azimuth range of +/- 20¡Æ for a total of 40¡Æ, What this means is that in Central Europe, for example, reception is guaranteed for nearly every satellite from the ASTRA 28¡Æ position and the TELECOM 2A position at 8¡Æ West.
While offset antennas often have a limited elevation setting, the TOROIDAL55 can be set anywhere from 0¡Æ to 90¡Æ, so now the only limitation is the lack of available DTH satellite.
It doesn¡¯t matter if the signals are in circular or linear polarization.
This antenna works in today¡¯s standard Ku-band (10.95 to 12.75 GHz).
Great value was placed on the antennas capability to withstand wind (up to 40m/sec) and its weather-proofing.
Both of the reflec-tors are made out of galvanized steel and coated with a polyester epoxy. Even the mount and foot are made out of stainless steel.
Installation is quite easy with no special knowledge required.
Elevation and Azimuth data are available from the SatcoDX CD-ROM via a simple mouse-click. Of course, the cables - and there could be up to ten of them - need to be connected somewhere.
And that¡¯s where the matching multiswitches come in. But for all of this to work, the receiver has to be DiSEqC compatible and then nothing more will stand in the way of better reception.
The set-up work involved here is only a fraction of what would be needed to install a motorized system.
Of course a motorized system could view all of these satellites also, but the disadvantages include the noise level of the motor the aging mechanical compo-nents and the waiting time as the antenna moves from one satellite to another.
A fully laded TOROIDAL55 carries with it some extra costs because of all the LNB¡¯s, but when you consider what these converters really cost today, the extra cost doesn¡¯t amount to all that much. Either that, or you can start off with only a few LNB¡¯s and add more at a later time.
Conclusion
If you have more than three Ku-band sat-ellites that you are looking to receive , then the TOROIDAL55 might be just right for you.
The antennas gain is sufficient for most of the DTH satellites. Simple installation, good reception results and high-quality construc-tion highlight this unusual antenna.
The larger version (90cm) which can be used with a maximum of 16 satellites, will be presented in the next issue of TELE-satellite magazine.
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"Wave Frontier launches multi-beam antenna" Korean company Wave Frontier is introducing is Toroidal dual reflector multi-beam antenna.
The product can receive signals from sev-eral satellites at the same time and Wave Frontier says the system is very different from parabolic antennas in both formula and shape.
The Toroidal consists of two reflectors. The convex-concave sub-reflector is from a virtual Toroidal, but the main reflector is analo-gous to an ellipsoid. The product also allows for the installation of multiple LNBs on one dish antenna.
Although some offset antennas can achieve this, the company says offset anten-nas can only receive signals from a few satellites located in a very close azimuthal range and the signals of sub-LNBs are weaker than main LNBs.
The Toroidal antenna, on the other hand, has several gains in each point across the surface. The product can also receive broadcasting and internet signals from one satellite, without the need of a second satellite antenna.
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Wavefrontier's New Multi-Satellite Antenna Outperforms Competition and Design Expectations in Independent U.S. Tests Wavefrontier Introducing World's First Commercial Toroidal Multi-Satellite Antenna Based on breakthrough technology developed by scientists and engineers in Korea and Russia, Wavefrontier's Toroidal 55 antenna performed as well or better than traditional, single-satellite parabolic antennas. ``With Wavefrontier's Toroidal 55 antenna, consumers, small businesses and large enterprises alike can use several DBS and commercial Ku-band satellites simultaneously,''said Woo Jun, president of American Wavefrontier Corp., the U.S. sales subsidiary of Korea-based Wavefrontier Co. Ltd. ``And they'll be ready for Ka-band service when it becomes available.'' The Toroidal 55 is the first mass produced, high grade, small dish multi-satellite antenna offered to the general public, and it is well suited for both consumer and enterprise applications. Wavefrontier plans to price the Toroidal 55 below the cost of two single-satellite antennas, creating a very attractive consumer selling proposition. Three rounds of tests were completed on the final production samples of the Toroidal 55 antenna, by Coram Engineering, an independent satellite antenna testing and design firm based in Pasadena, Calif. ``The results were better than what the R&D center projected,'' said David Darakjy, president and chief engineer of Coram. ``When you look at the 36 dB gain at the center position, it is comparable to a typical 60 cm single offset parabolic antenna manufactured by major U.S. suppliers.'' The Toroidal 55 successfully acquired signals from several different sets of DBS and commercial Ku-band satellites -- for example:
The tests were conducted on the final production samples of the dual reflector type Toroidal 55 antenna, which consists of a main reflector (53 cm high, 67 cm wide), a sub-reflector (25 cm high, 50 cm wide) and several different LNBFs. The tests focused on two key aspects: antenna gains at various LNBF positions and multi-satellite reception characteristics. Wavefrontier developed the Toroidal series of innovative dual reflector, multi-satellite antennas in conjunction with the Institute of Radio Engineering and Electronics of the Russian Academy of Science. Patents have been filed in both Korea and Russia. The first two models, Toroidal 55 and Toroidal 90, will be introduced shortly in the United States, and will be followed by the Toroidal 120 later this year. Wavefrontier is also in the process of obtaining regulatory and system operator certification for transmit and receive operations via the Toroidal series of multi-satellite antennas. Wavefrontier's Toroidal series of antennas makes use of toroidal geometry, rather than the more widely used parabolic formulas. The toroidal elements create a large focal line instead of the single focal point found on parabolic antennas. It is capable of five or more satellites at once, along an 80-degree arc. Since the Toroidal antennas use a discrete LNBF for each satellite, DBS, commercial Ku-band, Ka-band and in some cases C-band satellites can be mixed freely. Wavefrontier Co. was established in October 1999. It is a new venture company specializing in satellite antenna research, development and manufacturing. The company has headquarters in Seoul, Korea, with its R&D center in Moscow, its manufacturing plant in Taiwan and its U.S. sales subsidiary in Irvine, Calif. Wavefrontier is a member the KDB consortium and is participating as an antenna supplier. At the end of last year, the Korean government granted KDB the sole right to satellite broadcasting operations in Korea. |
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À±¼®¿ë »çÀåÀº "Á¶¸¸°£ Â÷·® · IMT 2000¿ë ¾ÈÅ׳ªµµ ¼±º¸ÀÌ¸ç ¼¼°èÀûÀÎ À§¼º¾ÈÅ׳ª Àü¹®±â¾÷À¸·Î ¼ºÀåÇÒ °èȹ" À̶ó°í ¸»Çß´Ù. (02)516-1600 ³»¿Ü°æÁ¦ À̼ö°ï ±âÀÚ/leesk@ned.co.kr |
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New antenna for Wireless Web developed A local venture firm has developed an antenna to be used for high-speed wireless
Internet services.
Wavefrontier said yesterday that it sent California Network of the U.S. the first sample
of the antenna,
The antenna transmits images faster and a lower cost than cable TV network and
uses a 25-29GHz band.
Wavefrontier has signed an agreement with California Network to initialy supply 20,000
antennas next
An official of Wavefrontier said the antenna is five inches in diameter as requested by
the U.S. firm,
Wavefrontier developed the antenna by appying the theory of "central symmetry lenz."
the official explained.
Silicon-based Calipornia Network was established in 1998 with a capital of $42 million.
It is planning to The Korea Herald 2000. 12. 15 |
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¿þÀ̺êÇÁ·ÐƼ¾î, ¾ÈÅ׳ª Çϳª·Î ¿©·¯ À§¼ºÀüÆÄ ¼ö½Å ¸ÖƼ À§¼º¼ö½Å ¾ÈÅ׳ª »ý»ê ¾÷üÀÎ ¿þÀ̺êÇÁ·ÐƼ¾î(´ëÇ¥ À±¼®¿ë)ÀÌ ÇϳªÀÇ
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°³¹ßÇß´Ù. Á¤Çö±Ç ±âÀÚ ( ¸ÅÀϰæÁ¦ 2000. 7. 21 ) |
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À§¼ºÀüÆÄ ´ÙÁß ¼ö½Å ¾ÈÅ׳ª °³¹ß À§¼º¼ö½Å¾ÈÅ׳ª »ý»ê¾÷üÀÎ ¿þÀ̺êÇÁ·ÐƼ¾î¢ß´Â 20ÀÏ ¾ÈÅ׳ª Çϳª·Î ¿©·¯ °³ÀÇ
À§¼ºÀüÆÄ¸¦ µ¿½Ã¿¡ ¼ö½ÅÇÒ ¼ö ÀÖ´Â '¸ÖƼ ¹Ì·¯·»Áî ¾ÈÅ׳ª' ¸¦ °³¹ß, ƯÇã Ãâ¿øÀ» Çß´Ù°í ¹àÇû´Ù.
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¡¸Developing Multi-Beam Lens Antenna Receiving 18 Broadcast Satellites in Maximum¡¹ WAVEFRONTIER Co. Ltd., one of the representative
venture business companies in Korea, was successful to develop the Multi-Beam
lens antennas receiving 18 broadcast satellites and which are available
for various telecommunications like wireless local loop, local multi-point
distribution, and satellite internet service, for the first time, in the
world. - Maeil Business Newspaper, The Electonic Times, Chosun Daily Newspaper, Seoul Business Newspaper, The Korean Economic Daily Newspaper, Weekly Dong-A, etc
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¾ÈÅ׳ª Çϳª·Î Àü¼¼°è À§¼ºÀ» ¾È¹æ¿¡¼... ¾ÆÆÄÆ® º£¶õ´Ù¸¦ ¼ö³õÀº Á¢½ÃÇü ¾ÈÅ׳ª¿©, ÀÌÁ¨ ¾È³ç-. À§¼º¹æ¼Û ¼ö½Å¿ë ÆÄ¶óº¼¶ó
¾ÈÅ׳ª¸¦ ´ëüÇÒ »õ·Î¿î ¾ÈÅ׳ª°¡ µîÀåÇß´Ù. ±âÁ¸ÀÇ Á¢½ÃÇü ÆÄ¶óº¼¶óÀÇ °æ¿ì ¾ÈÅ׳ª Çϳª·Î À§¼º¹æ¼Û ÇÑ Ã¤³Î¸¸À» ¼ö½ÅÇÒ ¼ö ÀÖ¾î
¼ö½ÅÀ» ¿øÇÏ´Â À§¼º¹æ¼Û ¼ýÀÚ¸¸Å »õ·Î¿î ¾ÈÅ׳ª¸¦ ¼³Ä¡ÇØ¾ß Çß´Ù. ÇÏÁö¸¸ À̹ø¿¡ °³¹ßµÈ '¸ÖƼºö(Multi-Beam) ¾ÈÅ׳ª'´Â
¾ÈÅ׳ª Çϳª·Î Àü¼¼°è ¸ðµç À§¼ºÃ¤³ÎÀ» ¼ö½ÅÇÒ ¼ö Àִ ȹ±âÀûÀÎ Á¦Ç°. ´Ùä³Î ¼ö½Å±â´É ¾ÈÅ׳ª·Î´Â ¼¼°è ÃÖÃÊ·Î °³¹ßµÈ °ÍÀ¸·Î ±¹³»´Â
¹°·Ð ¼¼°è ¾ÈÅ׳ª ½ÃÀå¿¡ µ¹Ç³À» ÀÏÀ¸Å³ °ÍÀ¸·Î ¿¹°ßµÇ°í ÀÖ´Ù. ÈÁ¦ÀÇ È¸»ç´Â ¿þÀ̺êÇÁ·ÐƼ¾î(ÁÖ)(´ëÇ¥ÀÌ»ç À±¼®¿ë).
ÀüÆÄ°øÇÐºÐ¾ß ¿£Áö´Ï¾îµéÀÌ ¸ð¿© ¼³¸³ÇÑ È¸»ç·Î '¸ÖƼºö ¾ÈÅ׳ª'°³¹ßÀ» À§ÇØ 97³âºÎÅÍ ·¯½Ã¾ÆÀÇ ±¹¸³ ÀüÀÚ°úÇבּ¸¼Ò¿Í °øµ¿¿¬±¸¿¡
µé¾î°¡ 2³â¿©¿¡ °ÉÄ£ ³ë·Â³¡¿¡ ¸¶Ä§³» °á½ÇÀ» ¸Î¾ú´Ù. ±è½Â·Ä ±âÀÚ : sykim@joongang.co.kr (Áß¾Ó ÀÌÄÚ³ë¹Ì½ºÆ® : 1999. 12. 7)
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"¾ÈÅ׳ª ÇÑ °³·Î ¿©·¯°³ À§¼º µ¿½Ã ¼ö½Å" ±¹³» º¥Ã³±â¾÷ '¸ÖƼºö' °³¹ß ±¹³» º¥Ã³±â¾÷ÀÎ (ÁÖ)¿þÀ̺êÇÁ·ÐƼ¾î(´ëÇ¥ À±¼®¿ë)°¡ ¾ÈÅ׳ª ÇÑ °³·Î ¿©·¯
°³ÀÇ À§¼ºÀ» µ¿½Ã¿¡ ¼ö½ÅÇÒ ¼ö ÀÖ´Â '¸ÖƼ ºö(Multi-Beam) À§¼º¼ö½Å ¾ÈÅ׳ª' °³¹ß¿¡ ¼º°øÇÔÀ¸·Î½á À§¼º Å×·¹ºñÁ¯À̳ À§¼º
ÀÎÅÍ³Ý ½ÃÀåÀÇ Ç÷§Æû¿¡ ÀÏ´ë Çõ½ÅÀÌ ÀϾ°Ô µÇ¾ú´Ù. Á¶¿ëÁØ ±âÀÚ : abraxas@donga.com (ÁÖ°£µ¿¾Æ, 1999. 12. 2 - Á¦ 211È£)
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½Å±â¼ú·Î Àϱº 'ÀÛÀº ±â¾÷ Å« ½Â¸® ÃÖ±Ù °« »ý±ä ÇÑ Áß¼Ò±â¾÷ÀÌ '¼¼°è ÃÖÃÊ'¶ó´Â ¼ö½Ä¾î¸¦ ´Ü À§¼º ¹æ¼Û ¼ö½Å
¾ÈÅ׳ª¸¦ °³¹ßÇß´Ù°í ÇØ¼ ÈÁ¦´Ù. À念Èñ ±âÀÚ (½Ã»çÀú³Î, 1999. 12. 2 - Á¦ 527È£)
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¡º·¯½Ã¾Æ ÀüÀÚ¿¬±¸¼Ò¿ÍÀÇ °øµ¿ ¿¬±¸°³¹ßÀ» È®´ëÇÏ´Â µî ½Å±â¼ú °³¹ß³ë·ÂÀ» °ÈÇØ ¿þÀ̺êÇÁ·ÐƼ¾î¸¦ ¼¼°è ¼öÁØÀÇ ¾ÈÅ׳ª Àü¹®¾÷ü·Î ¼ºÀå½Ãų °èȹÀÔ´Ï´Ù.¡» ¡¡ ¡¡¡¡ ÃÖ±Ù ÃÖ´ë 18°³ÀÇ À§¼º½ÅÈ£¸¦ ¼ö½ÅÇÒ ¼ö ÀÖ´Â ¸ÖƼ ºö À§¼º¼ö½Å ¾ÈÅ׳ª¸¦ ¼±º¸¿© ÁÖ¸ñ¹Þ°í ÀÖ´Â ¿þÀ̺êÇÁ·ÐƼ¾îÀÇ À±¼®¿ë »çÀåÀº ³»³âÁß 100´Þ·¯ ¼öÁØÀÇ º¸±ÞÇü À§¼º¼ö½Å ¾ÈÅ׳ª¸¦ ¾ç»êÇÏ´Â ÇÑÆí ¾ÕÀ¸·Î ¹æ¼Û, Åë½Å¿ë ¾ÈÅ׳ªÀÇ °³¹ß¿¡µµ ÁÖ·ÂÇÒ ¹æÄ§À̶ó°í ¹àÇû´Ù. ¡¡ ¡¡¡¡ ÀÌ È¸»ç°¡ ·¯½Ã¾Æ ±¹¸³ ÀüÀÚ¿¬±¸¼Ò¿Í °øµ¿À¸·Î °³¹ßÇÑ ¸ÖƼ ºö À§¼º¼ö½Å ¾ÈÅ׳ª´Â À§¼ºTV¸¦ ºñ·ÔÇØ WLL°ú LMDS, À§¼ºÀÎÅÍ³Ý µî ±¤´ë¿ª Á֯ļö¸¦ ÇѲ¨¹ø¿¡ ¼ö½ÅÇÒ ¼ö ÀÖ´Â Á¦Ç°À¸·Î ¾ÕÀ¸·Î Á¤º¸Åë½Å ±â¼úÀÌ ¹ßÀüÇÒ¼ö·Ï Ȱ¿ë ¹üÀ§°¡ ´õ¿í ³Ð¾îÁú °ÍÀ¸·Î Àü¸ÁµÇ°í ÀÖ´Ù. ¡¡ ¡¡¡¡ À± »çÀåÀº ¡ºÀ§¼ºTV ¾ÈÅ׳ªÀÇ ¼¼°è½ÃÀå ±Ô¸ð°¡ ¿¬°£ 4000¸¸´ë¸¦ ³Ñ¾î¼´Â µî ¾ÕÀ¸·Î ¾ÈÅ׳ª½ÃÀåÀÇ ¼ºÀå°¡´É¼ºÀÌ ¸Å¿ì Å« °ÍÀ¸·Î ÆÇ´ÜµÅ ÃÖ±Ù ¿þÀ̺êÇÁ·ÐƼ¾î¸¦ ¼³¸³, ¾ÈÅ׳ª½ÃÀå¿¡ ÁøÃâÇÏ°Ô µÆ´Ù¡»¸ç ¡º¿¬±¸°³¹ß ÀηÂÀ» ´Ã¸®°í R &D ºÐ¾ß¿¡ ´ëÇÑ ÅõÀÚ¸¦ È®´ëÇØ ¼¼°è½ÃÀåÀ» ÁÖµµÇÒ ¼ö ÀÖ´Â ´Ù¾çÇÑ Ã·´Ü ¾ÈÅ׳ªÀÇ °³¹ß, »ý»êÀ» ÃßÁøÇÒ °èȹ¡»À̶ó°í ¹àÇû´Ù. ¡¡ ¡¡¡¡ Áö³ 2³âµ¿¾È ¹«¿ª¾÷ü¸¦ ¿î¿µÇÏ¸ç ¼ºÀå»ê¾÷ÀÎ Á¤º¸Åë½Å ºÐ¾ß·ÎÀÇ ÁøÃâÀ» ¸ð»öÇØ¿Â À± »çÀåÀº ¿ì¿¬ÇÑ ±âȸ¿¡ ¸ÖƼ ºö À§¼º¼ö½Å ¾ÈÅ׳ªÀÇ °³¹ßÀηÂÀ» ¸¸³ª°Ô µÅ À̸¦ °è±â·Î º¥Ã³±â¾÷À» ¼³¸³ÇÏ°í »õ·Î¿î ½ÃÀå¿¡ °ú°¨È÷ ÁøÃâÇß´Ù. ¡¡ ¡¡¡¡ ÃÖ±Ù ¼±º¸ÀÎ ¸ÖƼ ºö À§¼º¼ö½Å ¾ÈÅ׳ª·Î º»°ÝÀûÀÎ ÇØ¿Ü½ÃÀå °ø·«¿¡ ³ª¼ ³»³â¿¡ 1¾ï´Þ·¯ÀÇ ¼öÃâ½ÇÀûÀ» ´Þ¼ºÇÑ´Ù´Â Æ÷ºÎ¸¦ °®°í ÀÖ´Â À± »çÀåÀº ¾ÈÅ׳ª ±â¼úÀ» ±â¹ÝÀ¸·Î ÷´Ü Á¤º¸Åë½Å±â±âÀÇ °³¹ß¿¡µµ ³ª¼ ÁßÀå±âÀûÀ¸·Î ¿þÀ̺êÇÁ·ÐƼ¾î¸¦ ¼¼°èÀûÀÎ Åë½Å±â±â Àü¹®¾÷ü·Î À°¼ºÇÒ °èȹÀÌ´Ù. ¡¡ ¡¡¡¡ À± »çÀåÀº ¶ÇÇÑ ¡º±âÁ¸ÀÇ »ç¾÷°æÇèÀ» »ì·Á ¿þÀ̺êÇÁ·ÐƼ¾î¸¦ ¾ÈÁ¤ÀûÀ¸·Î ¿î¿µÇϱâ À§ÇØ ½Å±â¼ú °³¹ß ¿Ü¿¡ ÀÚ±Ý, ¸¶ÄÉÆÃ ¹®Á¦ÀÇ ÇØ°á¿¡µµ ÁÖ¾ÈÁ¡À» µÑ »ý°¢¡»À̶ó°í ¹àÇû´Ù. ¡¡ ¡¡ |
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| ±¹³» ¹«±ÃÈ À§¼º°ú ½ºÅ¸, CNN µî ¿Ü±¹ À§¼º¹æ¼Û ä³ÎÀ» µ¿½Ã¿¡ ¼ö½ÅÇÒ ¼ö ÀÖ´Â ¾ÈÅ׳ª³ª °³¹ßµÆ´Ù. º¥Ã³±â¾÷ ¿þÀ̺êÇÁ·ÐƼ¾î»ç´Â "ÃÖ´ë 18°³±îÁö À§¼º ¹æ¼Û ÀüÆÄ¸¦ µ¿½Ã¿¡ ¼ö½ÅÇÏ´Â ¸ÖƼºö ¾ÈÅ׳ª¸¦ °³¹ßÇß´Ù."¸ç "ÇöÀç »ùÇà »ý»êÁßÀ̸ç, ÁÖ¹®·®À» È®º¸ÇÏ´Â ´ë·Î º»°Ý ¾ç»ê¿¡ µé¾î°¥ ¿¹Á¤"À̶ó°í ¹àÇû´Ù. ÀÌ ¾ÈÅ׳ª°¡ ½ÃÀå¿¡¼ ¼º°øÇÏ¸é ¼ÒºñÀÚ´Â ½Å±Ô À§¼º¹æ¼Û ä³Î¸¶´Ù °¢°¢ÀÇ ¾ÈÅ׳ª¸¦ ¼³Ä¡ÇÒ Çʿ䰡 ¾ø¾îÁú Àü¸ÁÀÌ´Ù. ÀÌ ¾ÈÅ׳ª´Â Áö¸§ 30-60cm µîÀÇ ´Ù¾çÇÑ ¾ÈÅ׳ª¸¦ ¿©·¯ ¹æÇâÀ¸·Î ¼³°èÇÑ °Í. Áö¸§ 60cm ÀÌÇÏ ¸ÖƼ¾ÈÅ׳ªÀÇ °æ¿ì 10GHz(±â°¡Ç츣Ã÷)-38GHzÀÇ Á֯ļö ´ë¿ªÀÇ ÀüÆÄ¸¦ ¼ö½ÅÇÒ ¼ö ÀÖ´Ù. À±¼®¿ë »çÀåÀº "´ëºÎºÐÀÇ À§¼º¹æ¼ÛµéÀÌ 10-13±â°¡Ç츣Ã÷ÀÇ Á֯ļö ´ë¿ª¿¡¼ ÀüÆÄ¸¦ ½î°í ÀÖ¾î, ´Ùä³Î ¼ö½ÅÀÌ °¡´ÉÇÏ´Ù"¸ç "¹Î¼ö¿ëÀ¸·Î ¸ÖƼºö ¾ÈÅ׳ª°¡ µîÀåÇÑ °ÍÀº óÀ½"À̶ó°í ¸»Çß´Ù. ´Ùä³Î ÇØ¿Ü¹æ¼ÛÀ» ½ÃûÇÏ·Á¸é, ¾ÈÅ׳ª ¿Ü¿¡ º¹¼öÀÇ Æ©³Ê¸¦ º°µµ·Î °®Ãë¾ß ÇÑ´Ù. ƯÈ÷ ÀÌ Á֯ļö´Â À§¼º¹æ¼Û ¿Ü¿¡µµ °í¼Ó À§¼º ÀÎÅͳÝ, ¹«¼± °¡ÀÔÀÚ¸Á(WLL), Ãʰí¼Ó °íÁÖÆÄ µ¥ÀÌÅÍ Åë½Å(LMDS)Àåºñ·Îµµ Ȱ¿ëÇÒ ¼ö ÀÖ´Ù. Áï ÇϳªÀÇ ¾ÈÅ׳ª·Î ¹«±ÃÈ 3È£ À§¼ºÀÇ Áß°è±â¸¦ ÅëÇÑ °í¼Ó ÀÎÅͳݰú ¿Ü±¹ À§¼º¹æ¼Û¼ºñ¸¦ ÀÌ¿ëÇÒ ¼ö ÀÖ´Â °Í. ±Çżö ±â¼úÀÌ»ç´Â "ÀçÁúÀÌ Àú·ÅÇÑ Æú¸®½ºÆ¼·»À¸·Î ¾ç»óüÁ¦¿¡ µ¹ÀÔÇÏ¸é °¡°ÝÀÌ Å©°Ô ³·¾ÆÁú °Í"À̶ó°í Àü¸ÁÇß´Ù. ÇöÀç °³´ç °¡°ÝÀº ¾à 1000´Þ·¯ ¼±.
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[¼¿ï°æÁ¦½Å¹®] - ¿þÀ̺êÇÁ·ÐƼ¾î '¸ÖƼºö' ¼¼°è ù °³¹ß |
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| ¾ÈÅ׳ª Çϳª·Î ¿©·¯°³ÀÇ À§¼º¿¡¼ ¼Û½ÅÇÏ´Â ¹æ¼ÛÀ» µ¿½Ã¿¡ ¼ö½ÅÇÒ ¼ö ÀÖ´Â À§¼º¼ö½Å¾ÈÅ׳ª°¡ óÀ½À¸·Î µîÀåÇß´Ù.
¿þÀ̺êÇÁ·ÐƼ¾î(´ëÇ¥ À±¼®¿ë)Àº ·¯½Ã¾Æ ±¹¸³ÀüÀÚ¿¬±¸¼Ò¿Í °øµ¿À¸·Î ¾ÈÅ׳ª Çϳª¸¸À» ¼³Ä¡Çϸé ÃÖ°í 18°³±îÁö À§¼º¹æ¼ÛÀ» ½ÃûÇÒ ¼ö ÀÖ´Â '¸ÖƼºö ¾ÈÅ׳ª'¸¦ °³¹ßÇß´Ù°í 22ÀÏ ¹àÇû´Ù. ±âÁ¸ÀÇ À§¼ºÇÑÅ׳ª´Â ÇѰ³¿¡ ÇϳªÀÇ À§¼º¹æ¼Û¹Û¿¡ ¼ö½ÅÇÒ ¼ö ¾ø¾î ¿©·¯°³ÀÇ À§¼º¹æ¼ÛÀ» º¸±â À§Çؼ´Â ±×¸¸ÅÀÇ ¾ÈÅ׳ª¸¦ ¼¼¿ö¾ß Çß´Ù. ÀÌ Á¦Ç°Àº À§¼ºTV »Ó¸¸ ¾Æ´Ï¶ó WWL, LMDS µî ±¤´ë¿ª Á֯ļö¸¦ µ¿½Ã¿¡ ¼ö½ÅÇÒ ¼ö ÀÖ¾î Ȱ¿ëÆøÀÌ ¸Å¿ì ³Ð´Ù. Ưº°ÇÑ °èÃø±â°¡ ¾øÀ̵µ ¼³Ä¡°¡ °¡´ÉÇÏ°í ¼³Ä¡°ø°£µµ ÆÄ¶óº¼¶ó ¾ÈÅ׳ª¿¡ ºñÇØ ÈξÀ ÀûÀº °ÍÀÌ Æ¯Â¡ÀÌ´Ù. ¶Ç ´«, ºñ¿Í °°Àº ±âÈĺ¯È¿¡µµ ¿µÇâÀ» °ÅÀÇ ¹ÞÁö ¾Ê¾Æ ¼³Ä¡Àå¼Ò¸¦ °í¹ÎÇÒ Çʿ䰡 ¾ø´Ù. ¾ÈÅ׳ªÀÇ Àç·áµµ °ª½Ñ Æú¸®½ºÆ¿·»À» »ç¿ëÇØ ´ë·®»ý»ê¿¡ µé¾î°¥ °æ¿ì ÇѰ³¿¡ 100´Þ·¯ ÀÌÇÏ·Î ³·Ãâ ¼ö ÀÖÀ» °ÍÀ¸·Î ȸ»çÃøÀº ±â´ëÇϰí ÀÖ´Ù. ¿þÀ̺ê´Â ÀÌ´Þ¸»ºÎÅÍ °øÃ»¿ë Á¦Ç°À» Áß½ÉÀ¸·Î ¼¼°è½ÃÀå¿¡ ¼±º¸ÀÏ ¿¹Á¤À̸ç Á¶¸¸°£ »ý»ê¿ø°¡¸¦ ÀÏ¹Ý ÆÄ¶óº¼¶ó ¾ÈÅ׳ª ¼öÁØÀ¸·Î ³·Ãç °¡Á¤¿ëÀ¸·Îµµ °ø±ÞÇÑ´Ù´Â °èȹÀÌ´Ù. ¶Ç Æò¸é, ÀΰøÁö´ÉÇü, À̵¿Åë½Å¿ë ¾ÈÅ׳ª µî °¢Á¾ ÀÀ¿ëÁ¦Ç°µµ °³¹ßÇÒ ¹æÄ§ÀÌ´Ù. ÇÑ °ü°èÀÚ´Â "¸ÅÃâÀÌ º»°ÝÀûÀ¸·Î ÀϾ´Â ³»³â¿¡´Â 1¾ï2,000¸¸´Þ·¯ ¸ÅÃâÀº ¹«³ÇÒ °Í"À¸·Î ¿¹»óÇϰí "¾ÕÀ¸·Î ȸ»ç¸¦ ¾ÈÅ׳ª Àü¹®¾÷ü·Î ƯȽÃÄÑ ³ª°¥ °Í"À̶ó°í ¹àÇû´Ù. |
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À̱ÔÁø ±âÀÚ : kjlee@sed.co.kr (¼¿ï°æÁ¦½Å¹® - 1999. 11. 23)
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[Çѱ¹°æÁ¦½Å¹®]ÃÖ´ë 18°³ À§¼º µ¿½Ã¼ö½Å |
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ÃÖ´ë 18°³ÀÇ À§¼ºÀ» µ¿½Ã¿¡ ¼ö½ÅÇÏ´Â TV¿ë ¾ÈÅ׳ª°¡ Çѱ¹ÀÇ º¥Ã³±â¾÷¿¡
ÀÇÇØ ½Ç¿ëȵȴÙ. ¿þÀ̺êÇÁ·ÐƼ¾î(´ëÇ¥ À±¼®¿ë)´Â ·¯½Ã¾Æ ±¹¸³ÀüÀÚ¿¬±¸¼Ò¿Í °øµ¿À¸·Î ¸ÖƼºö À§¼º ¼ö½Å¾ÈÅ׳ª¸¦ °³¹ßÇß´Ù°í 22ÀÏ ¹ßÇ¥Çß´Ù.
±âÁ¸ÀÇ À§¼º ¼ö½Å¾ÈÅ׳ª´Â ÇѰ³ÀÇ À§¼º¸¸ ¼ö½ÅÇÑ´Ù. ¿©·¯ À§¼º¹æ¼ÛÀ» ½ÃûÇÏ·Á¸é ¼ýÀÚ¸¸Å ¾ÈÅ׳ª¸¦ ¼³Ä¡ÇØ¾ß ÇÑ´Ù. ¼¼°èÀûÀ¸·Î ¸ÖƼ
ºö ¾ÈÅ׳ª °³¹ßÀº Ȱ¹ßÇÏÁö¸¸ ´ëºÎºÐ ±º»ç ·¹ÀÌ´õ¿ë µî Ư¼ö¿ëµµ·Î Á¦ÇѵŠÀÖ´Ù. ƯÈ÷ À̹ø¿¡ °³¹ßÇÑ ¾ÈÅ׳ª´Â WLL(¹«¼±°¡ÀÔÀÚ¸Á)
À§¼ºÀÎÅÍ³Ý µî ±¤´ë¿ª Á֯ļöµµ ÇѲ¨¹ø¿¡ ¼ö½ÅÇÒ ¼ö ÀÖ´Ù. Ȱ¿ëÆøÀÌ Å©´Ù´Â ¾ê±â´Ù. ÀÌ È¸»çÀÇ ±â¼ú°³¹ß´ã´çÀÎ ±Çżö ÀÌ»ç´Â "°ª½Ñ
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