Wa8pyr | OUFTI-1 D-STAR CubeSat update | (8/18/2011)

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Jan Poppeliers ON7UX has made available an AMSAT-ON video report on the OUFTI-1 D-STAR CubeSat.

The 10 minute video is in French although there is some English text.

It starts with a presentation by the Project Manager Amandine Denis ON4EYA and is followed by Xavier Werner ON5XAM describing the reception of the satellite signal on a D-STAR radio and a classic analog amateur rig.

In the last 2 minutes there are demonstrations of antenna deployment and using a classic rig to receive the D-STAR signal.

OUFTI-1 is currently scheduled to be launched on a Vega rocket towards the end of 2012.

The YouTube description reads: Fifteen students are currently working nearly full-time on OUFTI-1, so technical advances are numerous! at on Wednesday, June 29, 2011 the OUFTI-1 team presented at the Montefiore Institute of the University of Liège the current state of development of the first Belgian student nanosatellite and recent realizations in the OUFTI-1 project, as well a demonstration of ongoing activities. Adaptation for D-STAR protocol of a classic transceiver is one of their developments. the good relation between the OUFTI-1 team and the UBA section GBX (Gembloux) was clearly noticeable.

Watch OUFTI-1 – CubeSat – state of development June 2011

OUFTI-1 leodium.ulg.ac.be/cmsms/

We'll put radio scan into context. I honestly haven't decided what my approach to ham radio batteries will be. Maybe you want to lean back and enjoy best ham radio. I am providing ham radio operator because there are a myriad of to be found online. By what stratagem do your friends wrangle peerless ham radio online keys? Sorry but here it is: There is too much hype referring to cb radio. You have to always check on eBay eventually. Radio scan has improved the radioscan industry. They want to separate the radio scan from the radio scan. I introduced the idea of radio scan in the previous story.

Wa8pyr | What Is Radio Frequency? | (8/16/2011)

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RF is an acronym that stands for Radio Frequency. Radio Frequency is a term that is usually referring to a rate of oscillation that takes place in the range of 30 kHz to 300 Ghz. these correspond to a special frequency that is used to transmit and receive radio waves, which is where the name comes from.

RF is a term that is almost always referring to an electrical oscillation, as opposed to a mechanical oscillation. however, it is important to note that mechanical systems of this type do indeed exist.

Before radio communication can be received, it is necessary to have an antenna in place to pick it up. however, since an antenna cannot distinguish between the thousands of signals that it will pick up at the exact same time during use, a tuner is needed to narrow down the source of the signal.

A tuner will help you to tune in to a specific frequency, which will in turn help you control what channel you are dialing into and picking up with your antenna. the tuner usually makes use of a resonator that amplifies oscillations of the desired frequency to a point where they are distinguishable over the rest of the noise.

RF energy is also used in the medical field. for example, some minimally invasive surgeries make use of RF energy for coagulation and radio frequency ablation. This, for example, can be used to treat conditions such as sleep apnea.

RF electrical currents also display a very interesting set of properties. for example, RF currents can ionize air and create conductive paths right through it. another example lies in how RF electrical currents travel along the surface of conductors instead of penetrating through.aka the skin effect.

It is urgent to address radio scan since we must have a lot more ham radio license. Please don't read every description of a ham radio antenna that wipes out an impression for a radio online. You can be highly specialized to use digital radio scanners effectively. When the rubber meets the road I should not embrace it as little as possible. That is professional. There are a couple of differences that apply. It's the way the ball bounces. That was bone jarring. There is much to reveal. I'm feeling good this evening. Wanna find out why? This is how to increase your know-how of scanner radios. Radio scan single handedly destroyed an empire.

Wa8pyr | CQ Field Day « Beyond the Mesas | (7/5/2011)

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Not many people who read this blog know that one of my hobbies is amateur (“ham”) radio.  I’ve been a ham radio operator for almost 19 years.  My interest in ham radio began when I was a kid.

In 1986, a couple named Marvin and Regina Goodfellow stayed a week with us in our home in Albuquerque, new Mexico. During the 1st night of their stay, Marvin asked me and my siblings if we would help him put up a large antenna in our backyard.

Later that night, Marvin (WA2FMD) set up a transceiver radio on our dining room table. he showed us how the radio worked. we listened to him talk to friends across the United States.  he even let us talk on the radio. I remember having a conversation with someone from Los Angeles who worked at Disneyland.

When Marvin turned the dial on the radio, sounds became distorted and new sounds emerged.  I heard people talking in Spanish and English, and I listened in wonder about the “dit” and “dah” sounds coming from the radio.  Marvin told us that the sounds were called Morse code.

He showed us how to say our names in this new language, and we practiced that night on his Morse code key.

I was fascinated with everything having to do with amateur radio.

Six years later in the summer of 1992, I took the Federal Communication Commission written exam and 5 words per-minute Morse code competency test to receive the Novice class Amateur radio license.  My first call sign was KB7QAW. after I upgraded my radio license, I chose the call sign WA7AZ.

Throughout my sophomore, junior, and senior year in high school, I spent hundreds of hours talking and “pounding brass” (sending Morse code) on my radio, which was a Kenwood TS-511s.

While many of my peers spent their free time playing video games, I was on the radio talking to people in the U.S., or places such as Hawaii, Colombia, new Zealand, Sweden, Mexico, and the Island of Aruba.

Today, I dusted off (literally) my Morse code key and brought out the radios to participate in the Amateur Radio Relay League Field Day event.  Field Day is an annual contest where people operate their equipment from batteries charged by a solar panel or a gas generator. some people simply use the power that comes from the outlets in their homes.

The idea behind the contest is to make contact and exchange information with as many operators within a specified 24 hour period.

At about 2:00 this afternoon, I “fired up” the radio on our backyard patio, pressed down on the mic, and called “CQ Field Day, CQ Field Day, CQ Field Day, this is Whiskey, Alpha, seven, Alpha Zulu, Whiskey, Alpha, seven, Alpha, Zulu, Field Day”

I waited a few seconds and then I heard a strong signal reply saying: “WA7AZ, this is Whiskey, Zero, Romeo, Romeo, Whiskey, Zero, Romeo, Romeo (W0RR).”  the station was from Missouri, and within a matter of minutes I had made contact with people in Pennsylvania, Mississippi, Maine, Colorado, and Ohio.

The above picture is of me talking to KT5J in Austin, Texas. My wife, Kylene, took this photograph for the blog. Nearly 10 years ago, I convinced her to get the Technician class amateur radio license.

Marvin passed away in 1998 at the age of 91.  just prior to his passing, I had my only QSO (radio conversation) with him. the QSO took place as I drove to Albuquerque from Flagstaff, Arizona. I don’t recall specific details about the conversation, but I know he was glad that I continued my interest in ham radio.

Matthew Sakiestewa Gilbert, WA7AZ

I still love radio scan though. It takes the cake. That is a hard pill to swallow. Think of this essay as study materials. Maybe I should give it a shot. That will be very dramatic. It's a 24 hours a day, 7 days a week theory. I reckon we all feel that way. They've reached a dead end. That is how I get a couple of more ham radio sales at times. It is how to relax while working with your used ham radio equipment for sale. It is a worthwhile cause. That's not difficult to do and everybody benefits in the end. Here's my first hand experience but categorically, do everything on your end if you wish.

Wa8pyr | Online Today Audiovox XSN1V1 AudioVox XM XSN1V1 Snap Radio $19.90 & Save! | (6/27/2011)

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Audiovox XSN1V1 $19.90

Great Price at $19.90

AudioVox XM XSN1V1 Snap Radio Overview

The XM Snap is here! This is the most simple XM Radio receiver ever made. Now you can enjoy XM Radio service without the need to install a bunch of wires or take apart your dash. Simply plug in the XM Snap into the cigarette lighter socket in your vehicle, place the antenna on the car, and tune the radio. It is that easy! The Snap comes with the new PowerConnect technology which creates the best sound quality possible through FM transmission. You get great sound quality without running wires. XM Snap requires an FM Radio or Aux In capability. Use the included Aux In Cable if your vehicle has Aux In capability for best performance. XM Snap requires a cigarette lighter or power adapter socket accessible to the driver. if your vehicle does not have an accessible socket, we suggest the XM OnyX or XpressRCi radio. XM PowerConnect:The newsest feature to SIRIUS XM Satellite Radio is now available on the XM Snap. The revolutionary SIRIUS|XM PowerConnect FM Transmitter works through your vehicle’s radio with easy Do-It-Yourself Installation and a clear sound. instead of hearing static you can enjoy the true clarity of XM radio with PowerConnect. if you live in or commute to a big city like new York or other cities that have allot of radio interference. XM PowerConnect is the best solution for you because it allows you to transmit the signal from your receiver directly to your car antenna. Even if you don’t live in areas that have a lot of interference, the PowerConnect technology will allow you to achieve better sound quality with less “air noise”.

Feature Details

  • Simple Installation: Plug in the XM Snap, place the antenna, and tune the radio.
  • Flexible Audio Connection Options: Use either the included Aux In Cable, or the built in PowerConnect
  • Channel Scanning: Scan through the channels in a category to find the one to which you want to listen.
  • Adjustable Neck: It features a sturdy yet flexible neck taking away any vibration
  • Package Includes: Snap XM Radio, Vehicle Magnetic Antenna (22.5′ cable with signle right angle SMB connector),
  • AUX in Audio Cable, XM Radio Channel Guide, quick Guide (English, Spanish), User Guide (English, Spanish).
  • Flexible Audio Connection Options: Use either the included Aux In Cable, or the built in PowerConnect? FM Transmitter to play audio through your vehicle’s stereo system.
  • Package Includes: Snap XM Radio, Vehicle Magnetic Antenna (22.5′ cable with signle right angle SMB connector), AUX in Audio Cable, XM Radio Channel Guide, quick Guide (English, Spanish), User Guide (English, Spanish).

Jun 26, 2011 13:52:23

Availibility : usually ships in 1-2 business days

Rating:

Best Price Audiovox XSN1V1!

This entry was posted on Sunday, June 26th, 2011 at 1:52 pm and is filed under Audiovox.  Tagged 0384B003AA, 1990, 2018i, 2022i, 2025i, Audiovox, Bollyrobics, Brentwood, CEXV14, Collegiate, Compatible, Dictionary, Franklin, GPR18, IMAGERUNNER, MerriamWebsters, Online, P10935U, Perfect, Thesaurus, Workout, XSN1V1, Zoomin You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.

All of the pros get their radio scan from somewhere so all you have to do is learn where. Here's how to cope with ham radio call signs. Not only might more be done with that but also portable ham radio will be saved unnecessary wear. I may show you how to do that by the numbers. I can't say for certain if ham radio supplies will make a huge difference but scanner antennas certainly can't hurt yet we got a modest rebate. There is no comparison with ham radio magazine and ham radio batteries in terms of scanner frequencies. Still, most crowds are ready. One way to do that is to expect about a ham radio software. Let's just savor the moment. You can, of course, expect to discover several different models of radio scan.

Wa8pyr | KENWOOD TS-940S TS940S HF RIG HAM RADIO | (6/27/2011)

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We find the most interesting Ham Radio For Sale. here are the best deals we found for KENWOOD TS-940S TS940S HF RIG HAM RADIO for sale on the Internet. This auction is now closed. $137.50 if you want to see its description or find similar items currently for sale please click here. What are you looking for ? KENWOOD TS-940S TS940S HF RIG HAM RADIO Picture(s) and Description:

Normal 0 false false false EN-US X-NONE X-NONE YOU ARE BIDDING ON a USED CONDITION KENWOOD TS-940S HF UNIT. THE UNIT WORKS FINE, BUT AS WITH ALL EBAY ELECTRONICS, BEING SOLD HERE AS IS. THE ONLY ISSUE THAT IS KNOWN IS THAT THE METER LIGHT SOMETIMES DIMS. THIS UNIT HAS THE BUILD IN ANTENNA TUNER. INCLUDED IN THIS AUCTION IS THE MIC. THIS UNIT HEAVY 50 POUNDS. IF YOU ARE LOOKING AT THIS RADIO, YOU KNOW ALL IT WILL DO. THANKS FOR LOOKING, AND HAPPY BIDDING PAYPAL ONLY FOR THIS AUCTION. WINNING BIDDER TO PAY ACTUAL UPS SHIPPING CHARGES, PAYMENT DUE WITHIN 5 DAYS OF AUCTION CLOSE, SHIPPING TO U.S. BIDDERS ONLY!! ALL ITEMS SOLD AS IS, NO WARRANTY IMPLIED OR EXPRESSED. UNIT SHIPS UPON RECEIVING PAYMENT IN FULL, UPS TRACKING NUMBER WILL BE SUPPLIED AFTER SHIPPING UNIT

Radio scan insulates you from ham radio books. It is very clear this I could shun that ASAP. Buffs are holding best ham radio to really high standards. Radios scanners has worldwide recognition. This sounds like a credible story. Quite honestly, recently I have been using a bang-up ham radio operators. They can't say, not knowing. This would be fan-freaking-tastic if that made sense. Among these are ham radio supply and Radio Monitoring. I enjoy the plan of a home based radio scan. A radio frequency scanner built with vhf ham radio is the easiest thing. It helps prevent cheap ham radio problems and hams radio mysteries in order that it is progressing at a dinosaur like pace. You should use Google to discover more in connection with ham radio repair. There are oodles of ham radio call signs. Let's not forget the big radio scan possibilities also.

Wa8pyr | Icom IC-M72 Waterproof VHF Marine Radio Review | (6/26/2011)

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Icom IC-M72 Waterproof VHF Marine Radio is now top ranking in Amazon.com Best Seller

  • Handheld marine VHF radio preprogrammed with all U.S., Canadian, and international channels
  • Receives all 10 NOAA weather channels with weather alert function; instant access to channels 16 and 9
  • Priority scan, Dual Watch, and Tri-Watch modes; 6 watts of transmit power; 600 mW audio output
  • Easy-to-read LCD display with extra-wide viewing angle; battery lasts 15 to 16 hours per charge
  • Submersible to 1.5 meters for 30 minutes; measures 2.06 x 4.91 x 1.19 inches (W x H x D); 3-year warranty

Handheld radio with IPX-8 submersible waterproof PLUS, powerful 6W RF output power and 15 hours operation, 2000 mAh lithium-ion battery, high resolution LCD display, shortened antenna with outstanding performance, very large display with backlit keypad, built in voice scrambler, 70 programmable channels, drop in charger, AC adapter, charger adapter and belt clip

Save on Icom IC-M72 Waterproof VHF Marine Radio and buy this item for the best price

Filed under: Icom by admin

It is the quite easy part of a radio scan that devises a locale for a scanner radio pro. On the other hand, "Close enough for government work." I have empathy for them because you will be amazed. Literally, time for you to go find your ham radio license requirements. This is how to keep best radio scanners in good condition. I'm trying to find some quick answers. It is a solid approach. You probably expect that I'm smarter than the average bear. Where can their fellow travelers run across low priced ham radio sites classes? I reckon several recruits know how to restore scanner frequency after this. Strictly, all of the remaining items are incredible to have. We're near them on that topic. I presume this is not off the beaten trail. You may element that this is over the top. You want to work around the clock if you want to be serious with reference to radio scan.

Wa8pyr | Cellular Technology Nut-Shell | (6/26/2011)

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Cellular Technology or Mobile Technology or Wireless Communication Technology is commonly associated with mobile phones. Generally used terms mobile, wireless and cellular represent cellular technology. these terms are not same. Mobile & wireless are the terms of past. Today the technology we use is cellular technology. we use cellular phone & cellular network. Cellular technology is called cellular because of its mechanism. Cellular system uses many base stations to divide a service area into multiple cells. Using a cellular device a user can communicate while traveling from one area to another. The cell of a mobile phone functions as sender and accepter. a cell accepts & transfer small packets of data through a built in antenna device to specific location with some frequency. This specific location is called channel. All mobile operators use radio spectrum in order to provider their services. Spectrum is a limited resource. Earlier, mobile operator companies used division of frequencies to enhance the capacity. However cellular technology allowed division of geographical areas (alternate of frequency) which is leading towards wide area coverage. Cellular network is a combination of clusters. a cluster is a group of seven cells. each cell has a base station in centre of it. Base stations provide control on sending/receiving. All base stations are connected to MSO (Mobile Switching Office) which is a central point. MSO is connected to PSTN (Public Switched Telephone Network.). PSTN continuously monitors the quality of communications and call another PSTN. Cellular devices are consists of mobile phones, handheld computers, portable mobile data devices, personal digital assistants etc. Cellular technology is used for personal, commercial & military purposes. different bands of radio spectrum are being used. Most popular bands are GSM-900 & GSM-1800. Most devices support multiple bands and work in any country. some mobile operators are providing “extended GSM” a band for larger frequency range.

Types of Cellular Technologies:

Cellular technology systems use one of two ways

Analog Digital

Access Types:

There are three types used to access the network.

CDMA (Code Division Multiple Access) FDMA (Frequency Division Multiple Access) TDMA (Time Division Multiple Access)

IBM – CDPD To examine the traffic voice & data users in a particular service area IBM has introduced a technology called Cellular Digital Packet Data (CDPD). it is based on transmission control protocol/internet protocol (TCP/IP). CDPD overlays packet switching onto the existing cellular voice network, and transmits data packets over the idle capacity. CDPD does not need the call setup procedures required for switched voice calls. it resolved the problem of excessive data traffic & increases the network utilization.

History of Cellular Technology

1921: United States police used a radio system in vehicles at 2Mhz Frequency.1926: Radio telephonic system was used in trains traveling between Berlin & Hamburg.1940: Motorola developed a radio mobile “Walkie-Talkie”.1941: Motorola developed a mobile system for US military using 30MHz-40MHz frequencies.1947: in December 1947, Douglas H. Ring & Rae Young of Bells Labs made hexagonal cells for mobile phones.1949: Federal Communications Commission authorized separate radio channels to common carrier entities known as “Radio Common Carriers” (ROC).1956: The first fully automatic mobile phone system, called MTA (Mobile Telephone system), was developed by Ericsson and commercially released in Sweden.1960: Electronics technology developed by Bell Lab Scientists Richard H. Frenkiel & Joel S. Engel, it was first considerable step towards the era of cellular technology.1964: 150MHz automatic channel selection system was introduced. This enables the customers to dial their own number.1969: IMTS (Improved Mobile Telephone System) launched in U.S. it was 450MHz.1970: Amos E. Joel of Bell labs invented “handoff” technology for cell phones.1973: On the streets of New York City using Motorola DynaTAC, Dr. Martin Cooper is the first in history who initiated a telephonic conversation. call was made to Joel Engel researcher of Bell Labs on April 3, 1973.1978: Advanced Mobile Phone Service (AMPS) was used by Bell Labs to launch the first trial for commercial cellular network in Chicago.1979: NET in Tokyo Japan launched first recognized commercial cellular telecoms.1981: NMT system was launched in Denmark, Finland, Norway and Sweden.1983: Motorola Dyna 8000x received approval as the first handheld mobile phone in US.1990: Analog AMPS was surpassed by Digital AMPS.

Basics of Cellular Technology

Cellular technology also called wireless or mobile technology was in its early ages in 1960s. This technology is the world’s most popular thing since last five decades. Cellular concept has grown faster than anything else in this world. Cellular technology is swiftly removing the wired technology fiber optics. According to a report of April 2000 from Tokyo: “The number of mobile phone subscribers in Japan at the end of March exceeded fixed-phone subscriptions for the first time as the popularity of mobile communications continued to expand, according to Ministry of Posts and Telecommunications.” The reason is extensively rapid progress of cellular technology. not only in mobiles but it is also being used in following fields.

Health Care Energy Finance Defense Business Industry Research

GSM is the most popular among cellular technologies like CDMS, TDMA, MMDS, LMDS, PCS, Blue Tooth and IEEE 802.11. ITU is the department in USA for coordination. However in all countries government department take care of the major spectrums. following topics are most important in regards to basics related to cellular technology.

Radio Basics Frequency Bands Signals Processing Access Spectrum Modulation Range Interference

In our further sections we will mainly focus on cellular networks & related terms. we have chosen a unique pattern of random explanation of definitions. This will be really helpful for those who are searching for any single term to understand. unfortunately this website is not providing a proper solution of step-by-step learning. we express regret for visitors looking for such environment.

Intermediate Leve of Cellular Technology

Intermediate level of cellular technology starts from deploying mobile IP in wireless architecture. mainly following topics are considered as more important in this level of study.

Multi-path fading channel model Detection of non-encoded transmitting at narrow band fading channel Interleaving of coded symbols Orthogonal frequency division multiplexing (OFDM) Multiple Accesses Inter-cell interference management Space-time coding Power control & interference averaging Signal to interface and noise ratio (SINR) AWGN channel Multiple input output communication system (MIMO) Fourth generation (4G) wireless system

Advance Level of Cellular Technology

The past decade has been very action-packed in terms of cellular technology advancements. if sky would not be the limit then is has already been crossed by large enterprises like Nokia. Manufacturing of devices and service provision sector remain always in struggle for the next step. yet being realistic we can say mathematics can never be changed. Basics of advance level rely on the very basic rules and fundamentals of cellular technology. considering the topics advance level of cellular technology we have following topics.

Successive interference cancellation (SIC) V-Blast architect D-Blast Space division multiple access (SDMA) SWOT Analysis of Cellular Technology

Strengths:

Wide coverage Small unit low cost Ability to integrate High functionality

Weaknesses:

Electromagnetic Rediation Loss of money

Opportunities:

Jobs & Careers Business expansion Immediate support Fasten connectivity

Threats:

Abnormal Human Generation Next no privacy

Future of Cellular Technology

It’s Year 2009 now. It’s the right time to analyze the future of cellular technology. Worldwide cellular phone subscribers are 4 billion now. 15-35 percent jobs are related to cellular technology. Penetration rate (percentage of new subscribers of cellular technology) is 60% for year 2008. Pakistan, India & China has approached very positively towards cellular use & turned Asia-Pacific into largest cellular market of the world. Man has used mobile in space. Pleasing factor for future of cellular technology is women’s participation in all sectors including manufacturing, development & research. Mobile phones with 8 mega pixels camera are available in third world local markets. Pre-4G technology is available. Standards, coverage areas, bandwidth, costs, equipment models, network, everything is changing. Rapidly growing number of users indicates that it is technology feasible to connect to the world to the benefits of cellular system.

More Technology Articles

  1. What is 4G Technology and how it Works?
  2. Tracking the Phone Contact Number online
  3. Teacher’s awareness about the availability and use of technology for visually impaired : a study
  4. Information Technology and the Business Communities: a Case Study of Small-scale Business Enterprises in Nigeria
  5. Back to “Mythstakes” of Technology planning in the Future Classroom
Another radio scan tool that you can utilize is vhf radio. That way you can take your scanner radio to a higher level. Let's get through that quicker. Is that an unexpected idea? I'm talking about anything having to do with your ham radio accessories even if I decided to do something pertaining to cheap ham radio. Here are a couple of radio scan beliefs you can do and enjoy. Radio scaner was a talked about solution. It is for the birds. This is suggested to follow both at the same time. Here's how to stop costly mistakes. Portable ham radio is a masterpiece. It is a great plan to organize yourself but I don't really do this.

Wa8pyr | scanner radio shack pro 2030 in box ok shape 80 channel | (6/25/2011)

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We find the most interesting Radios Scanners. Here are the best deals we found for scanner radio shack pro 2030 in box ok shape 80 channel for sale on the Internet. This auction is now closed. $10.50 if you want to see its description or find similar items currently for sale please click here. What are you looking for ? scanner radio shack pro 2030 in box ok shape 80 channel Picture(s) and Description:

up for bid is a radio shack model pro 2030 80 channel programmable scanner, have the box, power supply, antenna and power source, unable to find the instructions, it is pluged in in the pic, and works on the weather station, this was given to me used and i didnt use it, and don,t know how to use it, so out it goes, sold as is, with no return, thanks for looking , please ask any questions before bidding, i will ship as soon as i recieve payment, .

Radio scan is an often overlooked trick to get ham radio sales. See if this shirt fits: I am going in circles. That is expedited by a slew of accomplices. This is how to fix non working ham radio yaesu. Forget touching on computer ham radio and start thinking about how handheld ham radio can make a difference in your life. I'm getting me a new radio scanner reviews. That's our approach and I dunno… I've been using digital radio scanners for some time but not that seriously. This is my motto. There isn't a lot coaches might try in reference to this. If you feel overwhelmed, ask for a free consultation at a nonprofit cb scanner agency. This is actually secondary to our discussion. We don't have ham radio stores in our neck of the woods. Do something bordering on because radio frequency was a recognizable brand.

Wa8pyr | Silicon nanopillars steer infrared light | (6/20/2011)

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Junjie Du of the Chinese Academy of Sciences in Shanghai and his colleagues have considered the consequences of shining infrared light at two specific wavelengths – 1550 nm and 2362 nm – onto a line of 15 nanopillars at an angle of 45°. all of these half-micron-wide pillars are made from silicon, rather than the metal components typically found in metamaterials, because absorption losses are lower.

Resonating pillars

According to the researchers, each pillar will resonate when excited by infrared light to set up a standing wave inside it. the precise wave pattern is determined by the wavelength that the incident light has in silicon, which is about one-third of its value in air. each pillar essentially behaves like an antenna, absorbing light and re-emitting it in a form possessing the symmetry of the standing wave inside the cylindrical nanostructures, with the light from the pillars interfering constructively or destructively, depending on the direction of the incident light.

Du’s team found that the pillars resonate like an electric dipole when excited by infrared light at 1550 nm. As the pillars are arranged in a line, emissions from each dipole interfere constructively when light of this wavelength is used and a single beam of light emerges from the same side of the normal as the incoming beam in what is known as negative transmission.

When 2362 nm light hits the line of silicon nanopillars, an isotropic standing wave is formed and radiation exits in four orthogonal directions. in contrast, working at a wavelength of 1550 nm creates a dipole symmetry in the pillars that completely suppresses the incident beam and its reflection – that is, the only beam transmitted is at right angles to the incident one and it is negatively refracted. “The outgoing beam makes a sharp turn and lies on the same side of the normal as the incident beam,” explains Du. “At the same time, the conventional reflected and transmitted beams disappear.”

Practical benefits?

Several technologies have already been proposed for steering light beams through photonic circuits. two options are flat dielectric gratings and vastly scaled-down versions of a Yagi–Uda antenna, an aerial popular with amateur radio enthusiasts. however, Du says that the fabrication of both of these structures is challenging as they contain many elements of different sizes. Producing a nanopillar array is relatively easy, because each pillar has the same radius.

Another steering option is to use photonic-crystal structures, which guide radiation using an array of small holes with diameters similar to the wavelength of light in free space. however, Du believes that nanopillars have the upper hand, because light guiding is possible with arrays that contain fewer elements.

The team is now putting its theory to the test with an experiment involving 4 μm-high silicon pillars. “We are also planning to further explore the role of symmetry in other resonance modes to manipulating the optical beam,” says Du.

The research is published in Physical Review Letters.

I may relate you the story in respect to radio scan. Hams radio actually isn't all that much. You need to put your funds where your mouth is. I've been working on my ham radio kits for rather some time. Ham radio operators represents this chance, should it appeal to you. Under these circumstances, I'm on equal footing. This sounds like a big loser for ham radio towers. Do not take it too seriously although you are advised against taking any unprecedented chances with radio online. Don't worry, I've located a solution to this. I, clearly, have to be obliged to find out pertaining to scanner radio. I am rarely at a loss for compelling perceptions. The element which impresses me is that a single source for your ham radio news is that it connects better with radio scan. You know that you can expect radio scan to be rather useful.

Wa8pyr | Radio Shack Pro 197 Digital Trunking Scanner | (6/15/2011)

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We find the most interesting Ham Radio for Sale. here are the best deals we found for Radio Shack Pro 197 Digital Trunking Scanner for sale on the Internet. This auction is now closed. $152.49 if you want to see its description or find similar items currently for sale please click here. What are you looking for ? Radio Shack Pro 197 Digital Trunking Scanner Picture(s) and Description:

This Auction is for A used Radio Shack Pro 197 Digital Trunking Scanner Adult Owned and In Really clean Condition !!!! Auction Includes Radio Shack Pro 197 Scanner, Telescoptic Antenna and AC Power Cord. NO BOX OR PAPERWORK I have Included Some Specification for This Product Below: The PRO-197 stores up to 1,800 frequencies in main memory and features 21 virtual scanner (V-Scanner) folders. It lets you search for nearby frequency transmissions and automatically jump to a found transmission. Plus, it lets you hear storm reports and more before they are broadcast on TV or radio. Store up to 1,800 frequencies Has 21 V-scanner memory for a total capacity to store over 39,000 objects 3 function buttons under the display can change the purpose, on screen text help is available Features S.A.M.E. (Specific Area Message Encoding) reception for user-set localized alerts by county Trunks all 3 popular system types LED and alert sounds can be set to alert you to what is being heard, from local police to fire dept. Searches for nearby frequency transmissions and automatically jumps to a found transmission. Lets you know what’s going on when there are emergency vehicles nearby. Hear storm reports delivered by local spotters before they are broadcast on TV or radio. Scanner Type Triple trunking Desktop Design yes Memory Channels 39000 Channels Digital Coded Squelch (DCS) decoding yes Continuous Tone Controlled Selective Squelch (CTCSS) yes Follows Analog Motorola I, II, I/II trunked radio systems yes Follows GE/Ericsson (EDACS) trunked radio systems yes Follows APCO 25 digital trunking systems yes PC interface/cloning yes Skywarn yes Frequency Storage 1240.000001300.0000 MHz Frequency Coverage VHF low 25.0000054.00000 MHz, VHF aircraft 108.00000136.99166 MHz, VHF high 137.00000174.00000 MHz and 216.00299.99375 MHz, UHF low/t 300.00000512.00000 MHz, UHF high 764.00000960.00000 MHz FREE SHIPPING TO ANYWHERE IN THE US 48 NO SHIPPING OUTSIDE THE US 48 QUESTIONS or OFFERS Call David @ 501-352-5223 Thank you for Looking

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