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A New Kind of Invisibility Cloak Demonstrates Better Cloaking Efficiency

A New Kind of Invisibility Cloak Demonstrates Better Cloaking Efficiency | KH6JRM's Amateur Radio Blog | Scoop.it

Michigan Technological University’s invisibility cloak researchers have done it again. They’ve moved the bar on one of the holy grails of physics: making objects invisible.

 

Just last month, Elena Semouchkina, an associate professor of electrical and computer engineering at Michigan Tech, and her graduate student, Xiaohui Wang, reported successful experimental demonstration of the use of non-conductive ceramic metamaterials to cloak cylindrical objects from microwave-length electromagnetic waves. Previously, Semouchkina had designed a non-conductive glass metamaterial cloak that worked with infrared frequency waves, which are shorter than microwaves.

 

Then, scarcely was the ink dry on their report in the IEEE Microwave and Wireless Components Letters, a journal published by the Institute of Electrical and Electronics Engineers, when they developed a different cloaking approach.

 

This time, they used ordinary dielectric materials such as ceramics having differing dielectric permittivity—a measure of the response of a substance to an electrical field— instead of metamaterials, which are artificial materials with properties not found in nature. They found that they were able to cloak larger cylindrical objects and cloak them more effectively than they had using metamaterials.

 

This research, just published online and supported by the National Science Foundation (NSF), also won Wang an honorable mention in an IEEE student papers competition. Wang’s paper will be listed in the Technical Program Booklet at an upcoming IEEE International Symposium on Antennas and Propagation. He received $1000 IEEE grant to travel to the symposium to present this work.


Via Dr. Stefan Gruenwald
Russ Roberts's insight:

From the frontiers of science...the invisibility cloak. Apparently, this experiment was successful. "Star Trek" and the Klignon's "cloaking device" are becoming science fact.  Keep you eyes on this development.  In some ways, this is a truly amazing century.  Aloha de KH6JRM.

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US-to-VK Transpacific Reception On 630 Meters Reported: - eHam.net

US-to-VK Transpacific Reception On 630 Meters Reported:
eHam.net
A radio amateur and medium-frequency (MF) experimenter in Australia has received a 630 meter (475.62 kHz) transmission from a radio amateur and Part 5 Experimental operator in Texas.
Russ Roberts's insight:

Here's the latest update on that 630 meter (475.62 kHz) reception report from an Australian ham who picked up a radio amateur operator in Texas running a part 5 (experimental) station.  This band has much potential even at the low power imposed by communications officials.  Aloha de Russ (KH6JRM).

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Yaesu FT-270R 2meter Handheld Amateur Radio Transceiver, Speaker Mic, Antennas

Yaesu FT-270R 2meter Handheld Amateur Radio Transceiver, Speaker Mic, Antennas | KH6JRM's Amateur Radio Blog | Scoop.it
in Consumer Electronics, Radio Communication, Ham, Amateur Radio (Yaesu FT-270R 2meter Handheld Amateur Radio Transceiver, Speaker Mic, Antennas - Full read by eBay: Price 77.99...
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Actually, the item offered for sale is a New Yaesu-Vertex VX-150 VHF Amateur Radio Handheld Transceiver.  This little rig has garnered good reviews and is quite sturdy.  The price of $199.95 seems reasonable.  As with any internet purchase, check out the item and the seller before you buy.  Aloha de Russ (KH6JRM).

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KH6JRM's Amateur Radio Antenna Topics: Simple Ham Radio Antennas: Antenna Basics. Post #291

Basic Antenna Rules. (Simple Ham Radio Antennas: Antenna Basics. Post #291 http://t.co/yxgxQDca3T #basicantennarules #dipoleantenna)
Russ Roberts's insight:

This post stemmed from an antenna discussion I had with Dean Manley (KH6B) this past Thursday over breakfast at a Hilo fast food restaurant.  Dean gave me an article from James R. Duffey (KK6MC/5) about "Some Rules of Thumb for Beginners" who want to design and construct their own antennas.  I found the article informative, often humorous, and extremely helpful in resolving some nagging antenna issues.  Aloha de Russ (KIH6JRM).

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Spark in the Park, Amateur Radio Expo

Spark in the Park, Amateur Radio Expo | KH6JRM's Amateur Radio Blog | Scoop.it
West Michigan Amateur Radio Expo is this Saturday 5-9PM. Satellite demo, look for me on FO-29. http://t.co/9ULyJmPvbJ
Russ Roberts's insight:

Four Michigan Amateur Radio Clubs are joining forces to bring you the "West Michigan Amateur Radio Expo on Saturday, 30 August 2014, from 5 p.m. to 9:30 p.m., at Douglas-Walker Prk in Byron Center, Michigan.  Free admission.  According to expo officials, the event is not a field day.  "It's kinda like a science fair for amateur radio, showing the many facets of amateur radio from portable satellite operations to VHF/UHF vehicle roving and from Arduino projects to Amateur Television.  For details, contact Tom:  k8tb@bosscher.org.  Aloha de Russ (KH6JRM).

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Fontana elementary school makes 'contact' with International Space Station - San Bernardino County Sun

Fontana elementary school makes 'contact' with International Space Station - San Bernardino County Sun | KH6JRM's Amateur Radio Blog | Scoop.it
Fontana elementary school makes 'contact' with International Space Station
San Bernardino County Sun
The exact date and time was not known until last week.
Russ Roberts's insight:

It's not everyday that you can discuss space flight with an astronaut living aboard the International Space Station ISS).  But, on Wednesday, a group of seven students from the Dorothy Grant Elementary School in Fontana, California did just that.  During the brief 10 minute pass of the ISS, the students asked various questions about life aboard an orbiting space station with German astronaut and geophysicist Alexander Geist.  The event was carried to every classroom in the school.  The event was organized by 4th grade teacher Beverly Matheson, who helped organize the school's amateur radio club.  The club uses the call sign K6DGE and has 45 members, with 23 students holding amateur radio licenses.  Aloha, de Russ (KH6JRM).

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Sable Island DXpedition - Southgate Amateur Radio Club

Sable Island DXpedition
Southgate Amateur Radio Club
Parks Canada, Maritime Air and the CY0C team will continue to assess the weather and landing conditions on the island leading up to September 8th. Meanwhile, preparations continue on schedule.
Russ Roberts's insight:

Here's the updated information on the planned Sable Island (CY0C) mini-DXpedition on 08 September 2014.  Parks Canada will allow only daytime operation on this day, so get set up early to snag this contact.  Aloha de Russ (KH6JRM).

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September DX Challenge.

DX and IOTA highlights from around the world.

Russ Roberts's insight:

Source:  "QST", September 2014, p.92.

Author:  Bernie McClenny (W3UR) (w3ur@arrl.org)

 

September 2014 promises some interesting DX for those willing to be patient. Here are some of the best choices:

 

5V (Togo).  Czech DXpedition team members OK6DJJ, OK1FPS, and OK1FCJ will be on-air from Togo for about 12 days at the end of September using call signs 5V7DB, 5V7PS, and 5V7ST.  The team will be using Elecraft KX3 transceivers with two amplifiers.  The team will be using two Spider Beams that will include 12, 17, and 30 meters, and one vertical for 40 meters.

 

FK (New Caledonia).  Bob (KD1CT) and Cezar (VE3LYC) will be the IOTA (Islands On The Air) team operating from Matthew Island (OC-218) as TX4A for 4 days in the 01-09 September time frame.  For details, visit http://tx4a.yolasite.com.

 

P2 (Papua New Guinea).  Derek (G3KHZ) is planning a multi-island IOTA DXpedition through Papua New Guinea in September.  He will be joined by Hans (SM6CVX) and Eddy (K5WQG).  For details, visit http://p29ni.weebly.com.

 

VK9X (Christmas Island).  Rob (N7QT) will be going to Christmas Island where he will be on-air as VK9X/N7QT from 03-13 September 2014.  He will be using CW, SSB, and digital modes on 3.5 to 28 MHz.  

 

Aloha de Russ (KH6JRM).

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dB or not dB? Everything You Ever Wanted to Know About Decibels But Were Afraid to Ask Abstract | TechOnline

dB or not dB? Everything You Ever Wanted to Know About Decibels But Were Afraid to Ask Abstract | TechOnline | KH6JRM's Amateur Radio Blog | Scoop.it
TechOnline is a leading source for reliable tech papers. View the dB or not dB? Everything You Ever Wanted to Know About Decibels But Were Afraid to Ask abstract for details on the dB or not dB? Everything You Ever Wanted to Know About Decibels But Were Afraid to Ask tech paper.

Via David Hall
Russ Roberts's insight:

Thanks to reporter David Hall for this excellent tutorial on decibels, or "Everything you wanted to know about decibels but were afraid to ask.  This technical paper covers decibels in more detail than I thought possible.  This abstract is worth keeping for your reference library or when someone needs to interpret what 59+20 dB over 9 really means.  Good, technical paper.  Aloha de Russ (KH6JRM).

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Tristan da Cunha and Gough Island DXpedition.

Early September on air date established.

Russ Roberts's insight:

Source:  Southgate Amateur Radio Club News.

 

Paul (ZS1S/AD9ZS) and possibly one other amateur radio operator will be on-air from Tristan da Cuna and perhaps Gough Island in early September.  The South African Antarctic Supply ship "SA Agulhas II" will leave Cape Town on 04 September 2014 with arrival at Tristan da Cunha 4 to 5 days later.  The ship will depart for  Gough Island after a few days and return to Tristan da Cunha ready for departure to Cape Town on 04 October 2014.  The amateur radio team will install a six meter propagation beacon (ZD9SIX) on Tristan da Cunha before they leave for Cape Town.  Aloha de Russ (KH6JRM).

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New Mellish Reef videos available.

Four new videos capture the excitement of this DXpedition.

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Source: Southgate Amateur Radio Club News.

 

New videos of the VK9MT DXpedition to Mellish Reef are now available.  For details, visit http://vk9mt.com.  Go to "media" and then o "video" to see the expedition videos.  Good stuff.  Aloha de Russ (KH6JRM).

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SpaceX Fail? Great!

SpaceX Fail? Great! | KH6JRM's Amateur Radio Blog | Scoop.it

Congratulations are due to Elon Musk and his Space Exploration Technologies (SpaceX) for generating an amazingly cool explosion over Central Texas Saturday morning when an experimental Falcon 9 Reusable (F9R) self-destructed after a launch anomaly. This temporary setback involved no risk to humans and followed an impressive number of successful tests on the path to dramatically lowering space launch costs via the development of a reusable launch vehicle.

 

While NASA's space shuttle demonstrated that an orbital spacecraft can be reused, and at least two other commercial firms are developing exciting new vehicles that can be reflown, these systems dispose of nearly all of the hardware required to put them into space in the first place. By accepting the long-standing assumption of a single-use launcher, they are locked into a cold war paradigm where every orbital launch is a $100 million event. Only SpaceX has been pushing to completely redefine the economics of space by returning the first and possible second stage assemblies and engines safely back to Earth. If perfected, such a system could reduce the cost of launching payloads or astronauts by an order of magnitude.

 


Via Stratocumulus
Russ Roberts's insight:

Despite the recent failure of its Falcon 9 Reusable Launch Vehicle, SpaceX is firmly committed to reusing as much of the launch system as possible.  At $100 million per NASA Shuttle Launch, the new Falcon 9 system marks a radical departure for sending payloads into space. If SpaceX perfects its Reusable Launch Vehicle, the new launch system "could reduce the cost of launching payloads or astronauts by an order of magnitude.   I trust that AMSAT is listening and will, investigate lower cost launch vehicles.  A low-cost constellation of amateur radio satellites similar to the old IMARSAT system would do a lot for emergency communications and the promotion of amateur radio.  Aloha de Russ (KH6JRM).

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IOTA news from OPDX,

Latest data from Tedd Mirgliotta (KB8NW).

Russ Roberts's insight:

Source:  Southgate Amateur Radio Club News.

 

Here's the latest Islands On The Air (IOTA) DX report from Tedd (KB8NW).

 

Some of the interesting island locations being activated include:

 

EU-080)--A Spanish team will activate EG1EI on Estela de Fora Island from 29-31 August 2014.

 

EU-174--Laci (HA0HW) will be active from Thassos Island from 12 September-22 September 2014.

 

NA-046--Bill (K2HVN will be on Martha's Vineyard on 20 September 2014 only.

 

OC-218--Cear (VE3LYC) and Bob (KD1CT) will be active from Mathhew Island from 04-07 September 2014.

 

Aloha de Russ (KH6JRM).

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Simple Ham Radio Antennas: The Multiband HF Stealth Vertical.

Simple Ham Radio Antennas:  The Multiband HF Stealth Vertical. | KH6JRM's Amateur Radio Blog | Scoop.it
https:www.youtube.com/watch?v=Uk8XD7BP1U. I ran across this article by Tony Milluzzi (KD8RTT) while I was searching for some stealth antenna ideas for my "antenna farm" at my new QTH in the Puna Di...
Russ Roberts's insight:

Here's an update of an antenna I built to replace the vertical antenna I lost during Tropical Storm Iselle on 07-08 August 2014.  I patterned the antenna after a video submitted by Tony Milluzzi (KD8RTT).  Great antenna--easy to build, cheap, and mostly invisible.  Aloha de Russ (KH6JRM).

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Ham radio equipment for base and mobile operation

Tom Fuszard's Business Builder (Ham radio equipment for base and mobile operation http://t.co/CJoIDApH6j)
Russ Roberts's insight:

Don't let the lack of a tower or an expensive transceiver stop you from enjoying amateur radio.  Even a simple rig and a basic antenna can do wonders for your station if they'r e installed carefully. In Tom Fuzzard's essay, he describes the very simple station  he has assembled:  a Kenwood 820 HF transceiver, basic power supply, a power/swr meter, a telegraph key, and a Butternut 6V vertical connected to about 80 radials.  His 2 meter mobile activity is conducted through a Radio Shack HTX-252 transceiver connected to a 5/8 wavelength mag mount antenna.  With this arrangement, Tom says he works " a number of HF bands without expending a lot of money or disrupting the natural beauty around our cabin."  Keep it simple and have a lot of fun for very little money.  Aloha de Russ (KH6JRM).

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Ford Explorer Ham Radio/Scanner Installation

I wanted to design a clean center console mount to hold two ham rigs, a scanner, a ScanGuage, and a speaker. The 2003 Explorer has a lot of center space but ...
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Excellent radio installation video.  Although the author owns a 2003 Ford Explorer, most of the wiring and position techniques are applicable to any vehicle.  The important thing is to take your time, be sure your power leads are fused, and to position your equipment where it won't distract your driving.  Aloha de Russ (KH6JRM).

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TV commercials will be quieter under new FCC rules

TV commercials will be quieter under new FCC rules | KH6JRM's Amateur Radio Blog | Scoop.it
The days of television commercials being startlingly louder than the shows people are watching could soon be coming to an end.

Via David Hall
Russ Roberts's insight:

Thanks to reporter David Hall for this interesting article.  Noise limitations on television commercials is long overdue.  Effective 04 June 2015, "TV commercials will be noticeably quieter"  under new rules established by the Federal Communications Commission (FCC).  In a statement to the "Federal Register," the FCC said "it is our hope that these changes will result in a modest decrease in the perceived loudness of certain commercials."  The new rules will apply to digital broadcasts, digital cable operators, and satellite providers.  Aloha de Russ (KH6JRM).

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US-to-VK Transpacific Reception on 630 Meters Reported - ARRL

US-to-VK Transpacific Reception on 630 Meters Reported - ARRL | KH6JRM's Amateur Radio Blog | Scoop.it
US-to-VK Transpacific Reception on 630 Meters Reported
ARRL
A radio amateur and medium-frequency (MF) experimenter in Australia has received a 630 meter (475.62 kHz) transmission from a radio amateur and Part 5 Experimental operator in Texas.
Russ Roberts's insight:

The 630 meter band is providing lots of excitement these days.  Take the case of an Australian ham who received the weak 630 meter signal from a Texas amateur radio operator.  John Langridge (KD5NJD), who holds a part 5 Experimental License (WG2XIQ) said the reception of his WSPR signal by Australian ham Davide Isele (VK2DDI) was a "huge surprise."  While the 8,710 mile distance between the two stations is not a record, "It does represent the sorts of accomplishments that the amateur radio community in the U.S. could enjoy if a band at 472-479 kHz ever becomes a reality."  Isele's antenna is fairly modest:  "a 30 meter thin, galvanized iron vertical wire, strung between a ground rod and a high tree branch for receiving on 630 meters...it has no radials and no antenna tuner." This slice of the rf spectrum just below the standard AM broadcast band has some intriguing possibilities.  Aloha de Russ (KH6JRM).

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All About Amateur (Ham) Radio (Condensed Version) HD

An introduction to Amateur Radio and the many possibilities it offers for learning, safety and security, and helping others throughout our world. This conden...
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Thanks to NW7US for this excellent, well-produced video showing the many facets of Amateur radio as a life-long pursuit of "learning, safety, and security."  The video also stresses the importance of spreading understanding and good will through amateur radio activities. The video is fairly short (19:45) and would be suitable for a technician license class.  Aloha de Russ (KH6JRM).

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N3ATS.com -- Antennas for Amateur Radio

N3ATS.com -- Antennas for Amateur Radio | KH6JRM's Amateur Radio Blog | Scoop.it
N3ATS - Wire antennas for HF amateur radio and SWL.
Russ Roberts's insight:

Steve Weiss (N3ATS) has opened a new web store specializing in "all coax-fed antennas."  On this post, Steve features a 4-band antenna, "which is only 42 feet (12.80 meters) long, yet is resonant on 30, 20, 15, and 10 meters if hung at 30 feet (9.14 meters).  For more information, visit http://n3ats.com.  Aloha de Russ (KH6JRM).

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SpaceX Puts AsiaSat 6 Launch on Hold for 'Triple-Check' | NBC News

SpaceX Puts AsiaSat 6 Launch on Hold for 'Triple-Check' | NBC News | KH6JRM's Amateur Radio Blog | Scoop.it

SpaceX postponed its launch of the AsiaSat 6 telecommunication satellite on Tuesday, just hours before its Falcon 9 rocket was due to lift off from Florida's Cape Canaveral Air Force Station. In a statement, SpaceX CEO Elon Musk said "we are not aware of any issue ... but have decided to review all potential failure modes and contingencies again." He expected the process to be completed within two weeks.


Via Stratocumulus
Russ Roberts's insight:

SpaceX has delayed the launch of a Falcon 9 rocket carrying the AsiaSat 6 telecommunications satellite.  In a prepared press release, SpaceX CEO Elon Musk said he "was not aware of any issue, but...decided to review all potential failure modes and contingencies again."  The "triple check" process should be completed within two weeks.  Aloha de Russ (KH6JRM).

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Seagate Ships World’s First 8TB Hard Drives

Seagate Ships World’s First 8TB Hard Drives | KH6JRM's Amateur Radio Blog | Scoop.it

Seagate Technology (NASDAQ:STX), a world leader in storage solutions, today announced it is shipping the world’s first 8TB hard disk drive. An important step forward in storage, the 8TB hard disk drive provides scale-out data infrastructures with supersized-capacity, energy-efficiency and the lowest total cost of ownership (TCO) in the industry for cloud content, object storage and back-up disaster recovery storage.

 

“As our world becomes more mobile, the number of devices we use to create and consume data is driving an explosive growth in unstructured data. This places increased pressure on cloud builders to look for innovative ways to build cost-effective, high capacity storage for both private and cloud-based data centers,” said Scott Horn, Seagate vice president of marketing. “Seagate is poised to address this challenge by offering the world’s first 8TB HDD, a ground-breaking new solution for meeting the increased capacities needed to support the demand for high capacity storage in a world bursting with digital creation, consumption and long-term storage.”

 

A cornerstone for growing capacities in multiple applications, the 8TB hard drive delivers bulk data storage solutions for online content storage providing customers with the highest capacity density needed to address an ever increasing amount of unstructured data in an industry-standard 3.5-inch HDD. Providing up to 8TB in a single drive slot, the drive delivers maximum rack density, within an existing footprint, for the most efficient data center floor space usage possible.

 

“Public and private data centers are grappling with efficiently storing massive amounts of unstructured digital content,” said John Rydning, IDC’s research vice president for hard disk drives. “Seagate’s new 8TB HDD provides IT managers with a new option for improving storage density in the data center, thus helping them to tackle one of the largest and fastest growing data categories within enterprise storage economically.”

 

The 8TB hard disk drive increases system capacity using fewer components for increased system and staffing efficiencies while lowering power costs. With its low operating power consumption, the drive reliably conserves energy thereby reducing overall operating costs. Helping customers economically store data, it boasts the best Watts/GB for enterprise bulk data storage in the industry.

 

“Cleversafe is excited to once again partner with Seagate to deliver to our customers what is truly an innovative storage solution. Delivering absolute lowest cost/TB along with the performance and reliability required for massive scale applications, the new 8TB hard disk drive is ideal for meeting the needs of our enterprise and service provider customers who demand optimized hardware and the cost structure needed for massive scale out,” said Tom Shirley, senior vice president of research and development, Cleversafe.

 

Outfitted with enterprise-class reliability and support for archive workloads, it features multi-drive RV tolerance for consistent enterprise-class performance in high density environments. The drive also incorporates a proven SATA 6Gb/s interface for cost-effective, easy system integration in both private and public data centers.


Via Dr. Stefan Gruenwald
Russ Roberts's insight:

This is a real game changer when it comes to bulk data storage.  According to a Seagate press release, "the 8TB hard disc drive increases system  capacity using fewer components for increased system and staffing efficiencies while lowering power costs...it boasts the best Watt/GB for enterprise bulk data storage in the industry."  Drives of this magnitude will become commonplace as the demand for digital storage grows.  There may be an amateur radio application here, especially for those into SDR (software defined radios), exotic digital modes, and contesting.  Aloha de Russ (KH6JRM).

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Sable Island mini DXpedition.

One-day operation set for 08 September 2014.

Russ Roberts's insight:

Source:  Southgate Amateur Radio Club News.

 

Here's the latest update on the Sable Island (CY0C) DXpedition. Parks Canada is only permitting daylight operation, so have your radio ready when the operators come ashore on 08 September 2014.  According to DXpedition members, the main objective of the Sable Island operation is "to assess the feasibility and practicality for future one-day amateur radio DXpeditions to Sable Island."  For details, visit http://www.cy0dxpedition.com. Aloha de Russ (KH6JRM).

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Baofeng UV-5RA+ Dual-Band 136-174/400-520MHz Ham Two-way Radio UHF/VHF handheld

Baofeng UV-5RA+ Dual-Band 136-174/400-520MHz Ham Two-way Radio UHF/VHF handheld | KH6JRM's Amateur Radio Blog | Scoop.it
in Consumer Electronics, Radio Communication, Walkie Talkies, Two-Way Radios (Baofeng UV-5RA+ Dual-Band 136-174/400-520MHz Ham Two-way Radio UHF/VHF handheld http://t.co/3oSpGajFhK #prepping #survival...
Russ Roberts's insight:

Here's a good price ($42.99) for the popular Chinese-made Baofeng UV-5RA, dual band VHF/UHF HT.  While I wouldn't have this HT as my primary hand held radio, it would make a nice  piece of portable equipment for your "go kit".  As with any internet purchase, check out the item and the reputation of the seller before you buy.  There are several user groups that will help you program this rig if the manual is hard to understand.  Aloha de Russ (KH6JRM).

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10 GHz under threat from broadband internet links.

Severe problem reported in Prague, Czech Republic.

Russ Roberts's insight:

Source:  Southgate Amateur Radio Club News.

 

According to Czech Republic Amateur Radio contest station OK2KKW, interference from commercial internet links are covering up weak ham stations in the Amateur Radio 10 GHz band.   I fear we are going to see more of this intrusion as the demand for broadband services increases.  Already, amateur radio access to the 2 and 3 GHz bands is being restricted in the UK because of the increased need for rf spectrum from mobile communications services and broadband internet services.  Even military users are being told to look elsewhere for spectrum in the UK.  I predict the erosion of amateur radio access to the microwave frequencies will continue at an accelerated pace.  Aloha de Russ (KH6JRM).

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Southend & District Amateur Radio Special Event - Southgate Amateur Radio Club

Southend & District Amateur Radio Special Event - Southgate Amateur Radio Club | KH6JRM's Amateur Radio Blog | Scoop.it
Southend & District Amateur Radio Special Event
Southgate Amateur Radio Club
...
Russ Roberts's insight:

There's nothing quite like operating a special event station to help a worthy cause.  Such was the case this past Sunday, 24 August 2014, when an amateur radio team from the Southend and District Amateur Radio Society participated in a fund raising effort for the Little Havens Hospice.  Using the special event call sign GB0FHH, the club was on-air from the Summer Music Festival at the Ekco Sports & Social Club in Southend.  For photos and more information, visit http://www.esexham.co.uk/news/southend-ars-aug-2-14.html. ; Aloha de Russ (KH6JRM).

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