Tuesday, December 30, 2014

Simple Ham Radio Antennas: A 5/8 wavelength 2 meter mobile antenna. Post # 353


I ran across this excellent "homebrewed" antenna video by Australian amateur radio operator Margaret (VK4MH) while I was searching for a replacement for my old Larsen 2 meter mobile antenna which has seen better days. The project appears to be a simple, basic design that can be made from readily available parts available at a home improvement or hardware store. If you want to take a shortcut, you could use an old Firestick CB antenna as the fiberglass form for the antenna. Just unwrap the old wire, leaving the fiberglass rod intact. You can use the base to attach to a CB mount and the adjustable tip at the top for tuning the antenna. Wind your coil and helix along the rod as specified in the video. Adjust the "stinger" at the top for tuning, and you're ready to go. Nice project from a few years ago (2008). For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. Happy Holidays from my family to yours! Aloha es 73 de Russ (KH6JRM).

Sunday, December 28, 2014

Simple Ham Radio Antennas: Non-Resonant Random Wire Antenna. Post #352


A nice, simple, uncomplicated, and easy to understand tutorial on how to make a "Non-Resonant Random Wire" Antenna from Stan Gibiliso (W1GV). I've built a few of these non-resonant antennas of varying lengths, each using materials I found around the shack or at the nearest home improvement outlet. For the purpose of Stan's lesson, he chose a length of wire measuring approximately 250 feet/76.21 meters. If you follow Stan's simple instructions, you'll find this distant relative of the beverage antenna works very well on 160, 80/75, 40, and even 30 meters. Stan stresses the importance of having both a good electrical ground and a RF ground. Stan shows you how to avoid current loops and nodes, things that create RF problems in the shack. You will need an antenna transmatch ("tuner") to make this antenna work properly. I have a similar antenna at my vacation home in the Puna District of Hawaii Island and it works very well on 80, 75, and 40 meters. As an added bonus, the non-resonant random wire antenna works great on the MW broadcast band. I've enjoyed many a peaceful listening experience with this random wire antenna hooked to the antenna input of my classic Hallicrafters SX-62A receiver. You can't beat a pair of 6V6 tubes for nice sound. So, have some fun with that extra wire collecting dust in the garage. Build a non-resonant random wire antenna and see what turns up. For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. If you want more Amateur Radio news, please check out my Amateur Radio news site at http://kh6jrm.net. Thanks for joining me today! Aloha es 73 de Russ (KH6JRM).

Saturday, December 27, 2014

Simple Ham Radio Antennas: How Antenna Tuners Work - KK4WW & N4USA. Post #351


This is an excellent antenna tuner tutorial from Gaynell Larson (KK4WW) and Dave Larson (N4USA). Dave covers all the basics, including SWR, basic tuner design, and proper use of antenna tuners. This video is a useful addition to your Amateur Radio Library. While it's possible to make antennas that don't require some kind of system to match the antenna impedance to your rig's impedance, most amateur radio operators I know use antenna transmatches ("tuners") to provide the best possible match between rig and antenna. This is especially important if the antenna is used for several amateur radio bands. The use of an antenna tuner is required if you use balanced feed lines, such as 450 ohm ladder line, 300 ohm television twin lead, or homebrewed balanced feed lines. A balanced tuner will do the job of matching antenna to rig. You could also run your balanced feed line into a 4:1 balun and then onto your tuner with a small length of 50 ohm coaxial cable, such as RG-8X or RG-8. Antenna tuners can maximize the use of a single wire antenna. Also, be sure to have a proper ground system for your shack. I use a copper grounding stake attached to four, 80 meter radials (each approximately 65 feet/19.81 meters) spread out through the rain forest in my back yard. I also attach a "multi-band counterpoise bundle" to the ground lug of my Drake MN-4 "tuner." This arrangement works well for my 80 meter delta loop, the 80 meter inverted vee, and the 135-foot/41.15 meters doublet antenna. This video from Dave and Gaynell contains a lot of useful information. For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. If you want more Amateur Radio news, please visit my news site at http://kh6jrm.net. Aloha es 73 de Russ (KH6JRM).

Friday, December 26, 2014

Graphene-Based Nano-Antennas May Enable Networks of Tiny Machines - Department of Electrical Engineering. Post #350

Graphene-Based Nano-Antennas May Enable Networks of Tiny Machines - Department of Electrical Engineering: "Graphene-Based Nano-Antennas May Enable Networks of Tiny Machines


Networks of nanometer-scale machines offer exciting potential applications in medicine, industry, environmental protection and defense, but until now there’s been one very small problem: the limited capability of nanoscale antennas fabricated from traditional metallic components.

Assistant Professor Josep Jornet's research with his advisor, Professor Ian Akyildiz on graphene based nano antennas has been featured by the Science andTechnology News Center of Georgia Tech.

The project shows that "the concept of graphene-based nano-antennas is feasible, especially when taking into account very accurate models of electron transport in graphene. Many challenges remain open, but this is a first step toward creating advanced nanomachines with many applications in the biomedical, environmental, industrial and military fields".

The article may be found at:
"Graphene-Based Nano-Antennas May Enable Networks of Tiny Machines"

Jornet is a member of the Signals, Communications and Networking Research Group in UB’s Department of Electrical Engineering in the School of Engineering and Applied Sciences. The group carries out research in: wireless communications and networking, cognitive radios, extreme environment (i.e., underwater, underground) communications, secure communications, data hiding, information theory and coding, adaptive signal processing, compressed sensing,  multimedia systems, magnetic resonance imaging and radar systems.

Other members of the group include professors Stella N. Batalama, Adly T. Fam, Dimitris A. Pados, Mehrdad Soumekh; associate professors Michael Langberg, Tommaso Melodia, Weifeng Su and Leslie Ying; and assistant professors Nicholas Mastronarde, Gesualdo Scutari, Zhi Sun."

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I found this fascinating antenna article while I was taking a break from building a new 80-meter delta loop at my vacation home in Hawaii's Puna District.  Much of the original research was done by scientists at the Georgia Institute of Technology.  Researchers apparently have designed an extremely small antenna made from graphene that works in the 0.1 to 10 tetrahertz range.  The ground breaking technology allows antennas to be made much smaller than equivalent antennas made from gold, silver, or copper (which doesn't work too well at these super high frequencies).  Georgia Tech researchers found these super tiny graphene nano-antennas were more efficient than their metal counterparts.  Applications for this evolving technology include communications, biomedicine, environmental monitoring, industrial uses, and military purposes.  Graphene nano-antennas would also be useful for cellular phone systems and Internet-connected laptop communications.  Amateur Radio operators would have fertile ground in the near-light spectrum with graphene nano-antennas. Imagine a series of "light" repeaters in your neighborhood...talk about broadband.  With conventional VHF and UHF spectrum being auctioned off to the highest bidder, perhaps amateur radio operators should stake a claim in the tetrahertz region.  Some hams are already experimenting in this area.  Nowadays, the only part of the rf spectrum that "sort of belongs" to us lies in the near-light, low MF, HF, and VLF regions of the spectrum.  Let's us use what we have and perhaps contribute something meaningful to the naysayers who are always calling Amateur Radio obsolete, environmentally incompatible, or even ugly.  A re-reading of Clinton DeSoto's classic "200 Meters on Down" seems appropriate here. For more information on Graphene nano-antennas please visit these sites:

http://www.news.gatech.edu
http://www.engineering.buffalo.edu.

For the latest in Amateur Radio news and events, please check out the blog sidebars.  These news feeds are updated daily.

You can follow our blog community with a free email subscription or by tapping into the blog RSS feed.

Aloha es 73 de Russ (KH6JRM).



'via Blog this'

Wednesday, December 24, 2014

Pyramid nanoscale antennas beam light up and down. Post #349

Pyramid nanoscale antennas beam light up and down: "Researchers from FOM Institute AMOLF and Philips Research have designed and fabricated a new type of nanoscale antenna. The new antennas look like pyramids, rather than the more commonly used straight pillars. The pyramid shape enhances the interference between the magnetic and electric fields of light. This makes the pyramid-shaped antenna capable of enhancing light emission and beaming different colours of light towards opposite directions. This finding could lead to more efficient light emitting devices (LEDs). The researchers published their results online on 12 December 2014 in Physical Review Letters.

Individual antennas
A straight nanoscale antenna will mainly respond to the electric field of light. This means that the effects of the magnetic field of light, which holds half of the energy of light, are disregarded. For a long time this was not considered as an issue that could be solved, because most of the metals used to fabricate antennas do not respond to the magnetic field of light anyway.
This changed recently, due to the rapid developments in metamaterial research. What seemed to be impossible in the past – making antennas that respond strongly to the magnetic field of light—can now be done by structuring metals on the nanoscale.
With these ideas in mind, the AMOLF and Philips researchers built the pyramid shaped antenna. By carefully designing the height and inclination of the antenna's side walls, the researchers found that the response to the magnetic field of light is almost as strong as the response to the electric field of light.
Antennas in an array
After witnessing the described effects in individual nanoscale antennas, the researchers took it one step further and placed multiple pyramid-shaped antennas in an array. The effect that the antennas have on each other turns out to be quite striking. At certain wavelengths (colours) of light, the antennas can couple to each other via the light that is scattered on the surface of the array. This makes the group of antennas more effective in beaming light than the sum of the individual antennas. In addition, the antenna array may operate collectively at one wavelength, while at the same time the antennas operate individually at a different wavelength. Thus, the same array of pyramid-shaped antennas may beam light of a certain colour upward, and of a different colour downward.
Applications
The array of nanoscale pyramid-shaped antennas has great potential for the improvement of LEDs. Currently, many LEDs are designed to emit light in one direction, for instance only 'upward'. Such LEDs are used for example in automotive lighting or spotlight illumination. Unfortunately, the light emitting material inside a LED emits light with equal intensities both upward and downward. Since only the 'upward' emission is useful, the downward moving light needs to be recycled by adding several optical elements, such as mirrors, to the LED. These elements make the LED bulky and less efficient, since some light is inevitably lost during the recycling process.
Integrating the pyramid shaped antennas in the LED has great potential for overcoming these disadvantages. The pyramid-shaped antennas are able to selectively beam one colour of light upward. If an undesired colour is present, this can be beamed downward. This development could greatly enhance the efficiency of single LEDs and improve the integration of LEDs in combined light systems.
Explore further: Wearable antennas for remote monitoring
More information: Breaking the symmetry of forward-backward light emission with localized and collective magnetoelectric resonances in arrays of pyramid-shaped aluminum nanoparticles, S.R.K. Rodriguez, F. Bernal. T.P Steinbusch, M.A. Verschuuren, A.F. Koenderink and J. Gómez Rivas, Physical Review Letters, published online on 12 December 2014.
Journal reference: Physical Review Letters
Provided by Fundamental Research on Matter (FOM)
view popular
4.9 /5 (7 votes)"
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Every once in awhile I like to expand my knowledge of antennas.  Getting a new perspective on antenna design is good for the mind and helps one "think out of the box."  Such is the case with this article from http://phys.org/news entitled "Pyramid nonoscale antennas beam light up and down.

It seems amateur antenna experimentation is headed in several directions, including work at 600 meters (472-479 kHz), 60 meters (5kHz), and in the tetraherz region near visible light.  The technology cited here will greatly "enhance the efficiency of single LEDs and improve the integration of LEDs in combined light systems."  The near visible light spectrum is ripe for research. During World War II, when Amateur Radio was severely limited to emergency work and WERS civil defense networks (many on VHF and UHF frequencies), many amateurs experimented with light communications and signals sent through power lines.  The development of these pyramid nanoscale antennas could open up another piece of the rf spectrum to serious investigation and experimentation by amateur radio operators.  This could be cutting edge research for all of us.  Universities and private companies have begun the work, so some research material is available.  Are we up to the task?

As we wrap up another year, please accept the best holiday wishes from my family to yours.  May the new year be one of promise, progress, and personal growth.

Aloha es 73 de Russ (KH6JRM).

'via Blog this'

Tuesday, December 23, 2014

Simple Ham Radio Antennas: Antenna Fundamentals 3 Bandwidth. Post #348


Thanks to Javier Anderson for sharing this classic military training film on antennas. This video is the final segment of an antenna study course produced by the National Film Board of Canada for the Royal Canadian Air Force. This film dates from the mid to late 1950s and contains the basic information necessary to discuss antenna bandwidth. The explanation is clear, uncluttered, and thoroughly understandable. This video could be made part of a basic Amateur Radio License Course. For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated frequently. You can find more Amateur Radio News at my news blog: http://kh6jrm.net. Thanks for joining us today! Happy Holidays to you and your family. Aloha es 73 de Russ (KH6JRM).

Monday, December 22, 2014

Simple Ham Radio Antennas: Antenna Fundamentals 2 Directivity. Post #347


This video is part of a Royal Canadian Air Force Training Film series produced by the National Film Board of Canada. Thanks to Javier Anderson for the tip. This classic film, most likely produced in the mid to late 1950s, does an excellent job of explaining important reception basics when using a radio. This series of videos would make an excellent feature for Amateur Radio License Classes. The dialogue is direct, uncomplicated, and thoroughly understandable. Great video. For the latest Amateur Radio News and Events, please check out the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. If you want more Amateur Radio news, please visit my news site at http://kh6jrm.net. Thanks for joining us today! Aloha es 73 de Russ (KH6JRM).

Friday, December 19, 2014

Simple Ham Radio Antennas: Antenna Fundamentals 1 Propagation. Post #346


I'm surprised just how good some of these old armed forces technical training films were. This video, probably dating from the late 1950s, gives a brief, well-organized overview of important propagation fundamentals when using radios. This excellent, simple, and completely understandable film was produced by the Film Board of Canada for The Royal Canadian Air Force. I'll keep a copy of this video for my reference library and for helping new ham operators get "a handle" on propagation basics. For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. For more Amateur Radio news, please visit my news site--http://kh6jrm.net. Aloha es 73 de Russ (KH6JRM).

Wednesday, December 17, 2014

Simple Ham Radio Antennas: Don Wallace W6AM 1984. Post #345


I'm afraid the title of this post is a bit misleading...nothing about Don Wallace's (W6AM--SK) life was simple. He lived a huge life and was one of the top DX chasers of all time. Until his death, he operated a multiantenna "farm" from the old Press Wireless site overlooking Palos Verdes, California. As a youngster, I remember his "booming" signal into Hawaii during the day. As this video shows, his station was better equipped and maintained than most commercial AM stations of that time. In this video from the California Radio Historical Society, Wayne Overback interviews Don Wallace for the PBS series "Radio Collector." The highlight of the interview is a tour of Don's mammouth antenna system. Nowadays, the antenna site once used by Wallace is now a condo development. I learned a lot about dedication and determination from viewing this video. I wish I could have met Don Wallace face-to-face. He sounded like a truly unique individual. For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. For more Amateur Radio news, please visit my news site at http://kh6jrm.net/ Thanks for being with us today! Aloha es 73 de Russ (KH6JRM).

Simple Ham Radio Antennas: Ham Radio General Class Lesson 6.2, Dipoles, Ground-planes, and Random Wires. Post #344


Here is another one of Dave Casler's (KE0OG) excellent, well-paced tutorials on amateur radio antennas. This time, Dave discusses antenna theory and design basic to passing the FCC Amateur Radio General Class License exam. Dave focuses his attention on Ground-Planes, Random Wires, and Dipoles--all of which can deliver plenty of contacts if they are built correctly. While Dave's advice on coaxial cable feedlines is quite good, I feel the use of balanced feeders (450 ohm ladder line or 300 ohm TV ribbon cable), coupled with a balanced antenna transmatch ("tuner"), will deliver comparable performance at less cost. A 135-foot/41.15 meters doublet (dipole) fed with 450 ohm ladder line or 300 ohm TV ribbon cable connected to a balanced tuner will cover all amateur radio bands between 80 and 10 meters. For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. For more Amateur Radio news, visit my news site at http://kh6jrm.net/. Thanks for joining us today! Aloha es 73 de Russ (KH6JRM).

Tuesday, December 16, 2014

Ham Radio - Ancestor of the Internet | Southgate Amateur Radio News. Post #343.

Ham Radio - Ancestor of the Internet | Southgate Amateur Radio News


This video by producer Mark Svoboda is one of the better historical programs related to Amateur Radio.  In this video, Svoboda provides a fascinating overview of Amateur Radio--its history and relevance to communication today.  Svoboda uses interviews with amateur radio operators and selected voice overs to show how Ham Radio became the first social network uniting electronics enthusiasts in the early 20th Century...a precursor to what we know today as the Internet.

For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily.

You can follow our blog community with a free email subscription or by tapping into the blog RSS feed.

Aloha es 73 de Russ (KH6JRM).

Sunday, December 14, 2014

Simple Ham Radio Antennas: Lesson 4.3 Feed Lines and SWR. Post 342


This is part of a continuing series of antenna videos produced by Dave Casler (KE0OG). This discussion on Feed Lines and SWR is aimed at newly licensed hams or those thinking about taking the Technician Class License Exam. Dave's presentation is smooth, simple, and completely understandable. This video would be an excellent way to supplement the ARRL Ham Radio License Manual (Technician Class). For the latest Amateur Radio news and events, please visit the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. Thanks for joining us today! Aloha es 73 de Russ (KH6JRM).

Saturday, December 13, 2014

Simple Ham Radio Antennas: 4.3 Antenna Properties & Terminology. Post #341.


This excellent, well-paced video was part of a junior electromagnetics course for electrical engineering students at Bucknell University. The video is designed to be used as the out-of-the-classroom component and combined with active learning exercises in class. The video covers some of the terminology and basic equations that engineers will use to define the properties of antennas. This antenna tutorial should be part of your reference library. The video could also be used in Amateur Radio License classes to supplement live instruction. For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily. For more Amateur Radio news, you can visit my news site at http://kh6jrm.net. You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. Thanks for joining us today! Aloha es 73 de Russ (KH6JRM).

Friday, December 12, 2014

Simple Ham Radio Antennas: Lesson 4.2 Antenna Fundamentals. Post #340


Nice, basic antenna tutorial for those aspiring to a Technician Class Amateur Radio License. Dave Casler (KE0OG) has produced a comfortably paced antenna introduction that follows closely the ARRL Technician Class License Manual. This video is part of an antenna series designed for newly licensed amateur radio operators or for those thinking about becoming amateur radio licensees. For more information, visit Dave's website at http://ke0og.net/training. For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. For more Amateur Radio News, please visit my news site at http://kh6jrm.net. Aloha es 73 de Russ (KH6JRM).

Wednesday, December 10, 2014

Simple Ham Radio Antennas: 4.1 Antenna Basics. Post #339


. Excellent antenna tutorial. The video is part of a series covering electromagnetics given to electrical engineering students at Bucknell University. The video is clear, well-organized, and thoroughly understandable. This video would make an excellent self-study assignment for those preparing for Amateur Radio License examinations. You could also download a copy of this video for your own antenna reference library. All of us get a little "fuzzy" on antenna theory as time marches on, and this video will serve to reaquaint you with some of the antenna basics needed to enjoy Amateur Radio. For the latest in Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. For a more detailed look at Amateur Radio News, please check out my Amateur Radio News Blog--http://kh6jrm.net. Thanks for joining me today! Aloha es 73 de Russ (KH6JRM).

Monday, December 8, 2014

How About a New 12 Volt Automotive Connector? - The K0NR Radio Site. Post #338

How About a New 12 Volt Automotive Connector? - The K0NR Radio Site: How About a New 12 Volt Automotive Connector?
Posted on 2 December 2014 by K0NR — 3 Comments ↓
Standard power connections are a great thing. A while back, I wrote about how the micro-USB connector became the standard power/data connector for mobile phones. (Well, that is unless you own an iPhone.)

The good news is that we do have a standard power connector for 12 VDC in automobiles. The bad news is that it is an ugly behemoth derived from — can you believe it? — a cigarette lighter. For some background and history, see the Wikipedia article.The Society of Automotive Engineers (SAE) even has a standard that describes this power connector (SAE J563). Alan K0BG correctly warns us to “never, ever use existing vehicle wiring to power any amateur radio gear” including the 12 volt accessory plug. (I always follow this advice, except in the cases when I don’t.) I also found this piece by Bill W8LV on eham.net that describes the crappiness of these connectors. Various innovations have improvedelectrical connections in many applications (USB, HDMI, Powerpole, etc.) butwe are still stuck with this clunky automotive powerplug.

Well, there is a new standard power connector showing up in cars: the USB port. These portsprovide the data and power interface for mobile phones, integrating them into the auto’audio system.Standard USB ports (USB 1.x or 2.0) have a 5V output that can deliver up to 0.5A, resulting in 2.5W of power. A USB Charging Port can source up to 1.5A at 5V, for 7.5 W of power. This is not that great for poweringeven low power(QRP) ham radio equipment.

Now a new standard, USB Power Delivery, is being developed that will source up to 100W of power. The plan is for the interface to negotiate a higher voltage output (up to 20V) with 5A of current. Wow, now that is some serious power. We will have to see if this standard is broadly adopted.

Two things are obvious to me: 1)the old cigarette lighter connector needs to go away and 2)it is not clear what the replacement will be.

What do you think? Any ideas for the next generation of 12V automotive connector?

73, Bob K0NR
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Nice analysis of the automobile power plug issue from Bob (K0NR). Bob says the old cigarette lighter connector has outlived it usefulness and something along the lines of a "USB Power Delivery System" should be the likely successor to this power plug issue. Great analysis of an issue common to many mobile radio systems. For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. For more Amateur Radio News, you can visit my Amateur Radio news site at http://kh6jrm.net. Thanks for dropping by! Aloha es 73 de Russ (KH6JRM). http://kh6jrm.blogspot.com

Saturday, December 6, 2014

Simple Ham Radio Antennas: Lesson 6.1 Antenna Basics. Post #337


This antenna tutorial from David Casler is one of the better explanations of antenna theory on the internet. David made this video to prepare potential ham operators for the General License Class FCC test. His graphics and presentation are first-rate. This video should be part of your Amateur Radio library. For more information, visit http://ke0og.net/general. For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. Thanks for joining us today! Aloha es 73 de Russ (KH6JRM).

Friday, December 5, 2014

Simple Ham Radio Antennas: Rebuild MFJ 1622 Apartment Antenna for Ham Radio HF. Post #336


The MFJ-1622 is a close copy of an apartment antenna originally marketed by Barker & Williamson (B & K). I bought one of these after I was first licensed as a novice operator (circa 1977). Like the author, "North Carolina Prepper", I replaced some components after a short period of use and found the antenna performed well as small, based-loaded vertical. An angled mounting bracket enables you to stick the antenna from an apartement window or balcony. To cut losses, replace the original coaxial cable with RG-8 or RG-8X and add a separate "counterpoise" wire for each band. The counterpoise wire can be spread around your apartment or along the ground if you're running your rig from a public park or beach. Performance will be enhanced if you add several radials or "counterpoise wires" for each band of use. This video can help you increase performance of this simple, fairly inexpensive apartment antenna. This antenna is inconspicuous, easy to mount, and easy to take down. For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. Aloha es 73 de Russ (KH6JRM).

Thursday, December 4, 2014

The Long Road to Maxwell’s Equations. Post #335

The Long Road to Maxwell’s Equations
Source: http://spectrum.ieee.org/telecom/wireless/the-long-road-to-maxwells-equations. Comment: A fascinating article on the life and times of James Clerk Maxwell, who developed the first unified theory of physics and who showed that "electricity and magnetism are intimately connected." The article also discusses the work of his contemporaries (Lodge, Heavyside, and Hertz) and how they used some of Maxwell's ideas to formulate their own theories of electromagnetism. Shortly before he died in 1879, Maxwell encapsulated his ideas into four equations which formed the basis of modern-day communications. The contributions of James Clerk Maxwell make him, in my humble opinion, one of the giants of radio. He belongs on the same podium as Tesla, Marconi, and Popov. For the latest in Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. Aloha es 73 de Russ (KH6JRM).

Wednesday, December 3, 2014

Simple Ham Radio Antennas: A Stealth Gutter Antenna for Ham Radio or Short Wave. Post #334


Excellent idea for a stealth antenna for those of us operating under burdensome HOA rules and CC&Rs. Just make sure the gutter is bonded together with pop rivets or screws to maintain integrity and electrical conductivity. I've built several versions of this antenna for various bands, all fed with fairly cheap RG-6 coaxial cable available as "end of reel" pieces from cable company installers. This 75-ohm coax is also available from the TV or cable accessories department of Walmart. My old Drake MN-4 antenna transmatch ("tuner") handled the slight mismatch between the cable impedance and the nominal 50-ohm impedance of my trusty Ten-Tec Argosy II. I also attached "counterpoise" wires (one for each band of use) to the ground lug of the Drake MN-4. This antenna is simple and it works. For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily. You can follow our blog community with a free email subscription or by tapping into the blog RSS feed. Aloha es 73 de Russ (KH6JRM).

Tuesday, December 2, 2014

- How will the 5G network change the world? - via Eagle Averro - Newsvine. Post #333

- How will the 5G network change the world? - via Eagle Averro - Newsvine: 1 December 2014

How will the 5G network change the world?

By Ed Ram

BBC News



The global race is on to develop 5G, the fifth generation of mobile network. While 5G will follow in the footsteps of 4G and 3G, this time scientists are more excited. They say 5G will be different - very different.

If you're thinking, "Great, that's the end of my apps stalling, video faltering, and that everlasting load sign," then you are right - but that's only part of the story.

"5G will be a dramatic overhaul and harmonisation of the radio spectrum," says Prof Rahim Tafazolli who is the lead at the UK's multimillion-pound government-funded 5G Innovation Centre at the University of Surrey.

That means the opportunity for properly connected smart cities, remote surgery, driverless cars and the "internet of things".

So, how best to understand this joined-up, superfast, all-encompassing 5G network? It seems that the term "harmonisation of the radio spectrum" is key.

A quick refresher: Data is transmitted via radio waves. Radio waves are split up into bands - or ranges - of different frequencies.

Each band is reserved for a different type of communication - such as aeronautical and maritime navigation signals, television broadcasts and mobile data. The use of these frequency bands is regulated by the International Telecommunications Union (ITU).

http://news.bbcimg.co.uk/media/images/79375000/jpg/_79375035_024508412-1.jpg

Currently, the radio frequency spectrum is a bit of a mess. As new technologies have been developed, frequencies for them to use have been squeezed into its gaps.

This has caused problems with connection speeds and reliability.

So, to pave the way for 5G the ITU is comprehensively restructuring the parts of the radio network used to transmit data, while allowing pre-existing communications, including 4G and 3G, to continue functioning.

100 times faster

5G will also run faster, a lot faster.

Prof Tafazolli now believes it is possible to run a wireless data connection at an astounding 800Gbps - that's 100 times faster than current 5G testing.

When Samsung announced in 2013 it was testing 5G at 1Gbps, journalists excitedly reported that would mean an HD film could be downloaded in a second.

A speed of 800Gbps would equate to downloading 33 HD films - in a single second.

http://news.bbcimg.co.uk/media/images/79375000/jpg/_79375031_79375029.jpg

5G's capacity will also have to be vast.

"The network will need to cope with a vast increase in demand for communication," says Sara Mazur, head of Ericsson Research, one of the companies leading the development of 5G.

By 2020 it is thought that 50 billion to 100 billion devices will be connected to the internet. So, connections that run on different frequency bands will be established to cope with demand.

Raising the capacity of a network is a little like widening a road tunnel.

If you add more lanes more cars can go through. And ordering makes it more efficient: some lanes for long-distance, others lanes for local traffic.

The huge rise in connected devices will be due to a boom in inanimate objects using the 5G network - known as the internet of things.

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It won't be just products like remotely controlling your heating or that mythical fridge ordering you more milk, trains could tell you which seats are free while they are in the station.

Devices will be able to choose dynamically between which of three still-to-be-determined bandwidths they use to avoid any of frequencies from becoming overloaded, explains Prof Tafazolli.

"Only once these frequencies are set and established can product development begin," Ms Mazur adds.

The aim is for the first of the frequency bands to come into use around the year 2020, with the other two to follow soon after.

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Another defining feature will be that, crucially, 5G shouldn't break.

"It will have the reliability that you currently get over fibre connections," says Sara Mazur.

Advances in antenna technology promise an end to sudden data connection drop-outs.

This will be essential for safety. Companies including China's Huawei are already talking about using 5G to let driverless cars communicate with each other and the infrastructure they pass.

Tech such as smart transport and remote surgery, where a human remotely operates a robot to carry out complicated operations, will rely on lower latencies too.

Latency refers to the time lag between an action and a response.

Ericsson predict that 5G's latency will be around one millisecond - unperceivable to a human and about 50 times faster than 4G.

This will be critical, for example, if doctors are to command equipment to carry out surgery on patients located in different buildings.

5G trial network

So how much will it all cost? Ericsson and Huawei say they simply don't know yet.

Until the product development phase starts it is too early to tell.

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But that doesn't stop them from wanting to flaunt their research to the market.

In South Korea, which spearheaded work on 4G, Samsung hopes to launch a temporary trial 5G network in time for 2018's Winter Olympic Games.

Not to be outdone, Huawei is racing to implement a version for the 2018 World Cup in Moscow.

Despite such apparent rivalries and the huge sums each is investing in R&D, the bigger story is that they are co-operating to deliver 5G. And that in turn paves the way for potentially unmatched new technologies.

"That's until 6G comes along in around 2040," Prof Tafazolli remarks.

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Comment:

The implications of 5G for Amateur Radio are huge.  5G networks will increase the demand for bandwidth as demand grows for self-driving cars, remote sensing, and what is called by Professor Rahim Tafazolli of the University of Surrey "the internet of things."  Already UK's Ofcom and our own FCC are refarming UHF and SHF frequencies (above 450 MHz) to accommodate broadband services.  Amateur Radio shares many of these frequencies with other government and public safety users--frequencies that could be lost in the coming years as demand for mobile data services increases.  These frequencies can be auctioned off to the highest bidder, with Amateur Radio and other radio services left with only a slim segment of their former allocations.  Just look what's happening in the 2.4 GHz band to get an idea where this trend is heading.  After the so-called "harmonization" of radio waves, Amateur Radio may find most of its activity restricted to frequencies below 70 cm (450 MHz).  This frequency grab reminds me of the attempts by commercial interests to seize Amateur Radio spectrum following World War I.  A reading of Clinton De Soto's "200 Meters On Down" will give you a feeling of those stressful times.  I fear those times are returning, especially when so much money can be made once these frequencies are auctioned off.  This may be a case where "money talks."  Perhaps, it's a good thing Amateur Radio is getting access to 60 meters (5 kHz) and 630 meters (472 kHz).  It's ironic that Amateur Radio is returning to the "radio basement" from whence it came more than a century ago.  Use it or lose it.

For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily.

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Aloha es 73 de Russ (KH6JRM).

Monday, December 1, 2014

Simple Ham Radio Antennas: Getting Around HOA Antenna Restrictions. Post #332


Here's another idea for an antenna system in a restricted housing area (HOA). This ham used a LDG S9V31 telescoping fiberglass mast vertical with 24 ground radials using CAT 5 cabling. He raises the mast from ground level when he uses it and lowers the mast when he is done. The vertical is colored green so it blends in with the surroundings. It also helps that he knows when HOA inspectors make their rounds. Not a perfect solution, but it works for this amateur radio operator. Of course, the best solution is not to live in a home governed by HOAs or CC&Rs. That option, however, is being reduced every time a new housing development opens for business. So, finding a home with no antenna restrictions is getting more difficult by the day. For most of my amateur radio "career", I've had to operate under restrictions, so, I'm aware of the difficulty of getting a decent antenna built without the housing police coming down on you. I've used indoor antennas (low power, of course) with some success. One of the more usable antennas in this scenario is the MFJ-1622, which uses a type of clamp to attach itself to a window sill or porch railing. By adjusting the tap on the coil, modifying the length of the small telescoping whip antenna, and by stretching out the supplied counterpoise wire to the correct length, you can get fairly good results. For more stealth antenna ideas, visit QRZ.COM/db/K8NDS. For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily. Aloha es 73 de Russ (KH6JRM).

SocialHams.Net: another place for hams to hang out - KB6NU's Ham Radio Blog. Post #331.

SocialHams.Net: another place for hams to hang out - KB6NU's Ham Radio Blog: SocialHams.Net: another place for hams to hang out
december 1, 2014 by dan kb6nu. This morning, I got an e-mail from Andreas, OE8APR. He’s the guy behind SocialHams.Net, a new social networking site for amateur radio operators. According to OE8APR, you can “You can meet people; chat online; check our top rated, featured items; read about popular topics; wish someone special on his/her birthday; match your interests; and even take advantage of our elaborate people search option.”

SocialHams.Net includes several apps that you can use to make your amateur�radio operating more enjoyable:

DX Cluster. This�tool, which Andreas claims is the�first HTML5 web socket based DXCluster client, allows you to monitor DX spots and spot DX stations that you hear on the air.

Logbook. The�logbook allows you �to add, edit, organize and sort their contacts all in one convenient location.

APRS Map.�The APRS feature displays the location of any APRS station in the viewable area. This feature also provides each member with the ability to send a message from socialhams to any APRS device with messaging capability.

NCDXF Beacon. The Beacon Map displays the location, status and the current or future action of each NCDXF beacon in the network. By listening for each beacon on each band you can determine which bands are open and to what part of the world.

Library. This is a collection of various documents like manuals, schematics, spreadsheets, etc

Elmer’s corner.�The Elmer corner allows any socialhams member to create and publish a tutorial or guide for the entire community to use.

Andreas is an industrial automation programmer by day and has been a licensed radio amateur since 2012. His ham radio interests include digital modes (PSK, WSPR, etc), HF, SOTA, and QRP. In addition to amateur radio, he enjoys mountain hiking, listening to music, programming, and electronics. When I asked �him what prompted him to start SocialHams.Net, he said, “After getting my license i thought it would be nice to have all functions needed for my ham tasks in one place. I think there are really good project out there but none of them offer so much functions in one place.”

Give it a try, and let him know what you think.
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Interesting article from Dan Romanchik (KB6NU) about a new ham radio social site.  The new meeting place seems loaded with features that would appeal to amateur radio operators.  I'll check it out.

For the latest in Amateur Radio news and events, please check out the blog sidebars.  These news feeds are updated daily.

Aloha es 73 de Russ (KH6JRM).

History This Week | Southgate Amateur Radio News. Post 330.

History This Week | Southgate Amateur Radio News: Page last updated on: Sunday, November 30, 2014


History This Week

A look back at events that made history this week -
compiled by the Summerland Amateur Radio Club of Lismore, NSW

Monday, 1 December, 2014

1732 James Blair was�rescued from a fire in a coal mine. William Tossach, a Scottish surgeon revived him using mouth to mouth ventilation.

1799 Metric System established in France.

1876 Daniel Stillson (Massachusetts) patents first practical pipe wrench.

1893 First Electric Car built in Toronto, could go 15 miles between charges.

1909 George Taylor makes first free flight in a glider at Narrabeen Beach, New South Wales.

1941 Japanese attack Pearl Harbor, brings the USA into WW2.

1942�First controlled nuclear chain reaction (Enrico Fermi - University of Chicago).

1996�NASA's first Mars rover launched from Cape Canaveral.

• Read last week's 'History This Week'

• Visit the Summerland Amateur Radio Club's website

Our thanks to John Alcorn, VK2JWA of the Summerland Amateur Radio Club for this weekly feature.
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One of the curious items found in the "Southgate Amateur Radio Club News" is the "History This Week" feature from John Alcorn (VK2JWA) and members of the Summerland Amateur Radio Club.  I've found these historical items make great "quiz bowls" in my classes at the Laupahoehoe Community Public Charter School on Hawaii Island.  This report contains a minor error in the 1941 entry. Pearl Harbor was attacked on 07 December 1941 and not on 01 December 1941.

For the latest Amateur Radio news and events, please check out the blog sidebars. These news feeds are updated daily.

You can follow our blog community with a free email subscription or by tapping into the blog RSS feed.

Aloha es 73 de Russ (KH6JRM).