SBARC-list August 2020

sbarc-list@lists.netlojix.com

3 participants
3 discussions

How Radar Helped Win World War II -Distinguished Lecturer Eli Brookner] August 26, 2020
by Gene Nelson, Ph.D. 25 Aug '20

25 Aug '20

>Date: Tue, 25 Aug 2020 03:06:17 +0000 (UTC) >From: Neal Swanberg <njswanberg(a)yahoo.com> >Subject: Fw: [Fwd: FW: How Radar Helped Win World War II -Distinguished > Lecturer Eli Brookner > >----- Forwarded Message ----- >From: Neal Swanberg <njswanberg(a)yahoo.com> >Sent: Monday, August 24, 2020, 08:05:11 PM PDT >Subject: How Radar Helped Win World War II >-Distinguished Lecturer Eli Brookner] > > > >----- Forwarded Message ----- >From: t3 <wb9vxy(a)gmail.com> >To: Swanberg Neal <njswanberg(a)yahoo.com> >Sent: Monday, August 24, 2020, 09:55:45 AM PDT >Subject: [Fwd: FW: How Radar Helped Win World >War II -Distinguished Lecturer Eli Brookner] > >For the group. > >T3 > > ><https://events.vtools.ieee.org/m/238225>https://events.vtools.ieee.org/m/238225 > >DISTINGUISHED LECTURE - HOW RADAR HELPED WIN WORLD WAR II > >DR. ELI BROOKNER > >WEDNESDAY, AUGUST 26. 3:30 PACIFIC TIME (6:30 ET) > >AESS Chapter Meeting. Virtual Meeting Registration open to all IEEE >chapters and sections to co-host and serve their local membership and >the public. Registration is being collected through Boston, watch out >for time zone as 6:30 eastern start time is 3:30 pacific. > > > >Talk for the general public of all ages and technical levels. > >Dr. Brookner will provide an easy to understand explanation of how >radar works. Radar was in its infancy at the start of World War II. The >British were using radar effectively along their coastline with a >network of antennas on 300-foot-tall towers to warn of approaching >enemy aircraft and missiles but they needed an invention that would >allow radars to be small enough to fit on ships and aircraft. They >invented the cavity magnetron and looked to American manufacturing >know-how and resources for rapid mass production. They were turned down >by all the major US firms, but a small Boston newcomer, Raytheon >Company, responded with a solution. The once small company ended up >making 85% of all magnetrons used by the allies in the war; this >changed the course of the war. By the end of World War II, Raytheonâs >shipborne radars were on all allied ships military and civilian. Radar >can see at night, through clouds, in and fog. Radar can be used to land >aircraft in zero visibility. Radar can be used to identify targets to >prevent fratricide, deploy forces optimally, for navigation, for >collision avoidance. > >Eli Brookner, global radar authority, worked at Raytheon Company from >1962 to 2014. Dr. Brookner will show just how dramatically the use of >radar on aircraft and ships helped to destroy enemy aircraft, ships, >missiles and submarines. How the use of miniature radars on the tops >of artillery shells immensely increased their effectiveness against >aircraft, missiles, infantry men and their equipment. These miniature >TOP SECRET radars, called proximity fuzes, used miniature glass tubes >which had to withstand 20,000 g when blasted from the artillery guns. >Raytheon was one of the suppliers of these tubes. 22,000,000 proximity >fuzes with 140,000,000 tubes were produced during WW II. > >Date and Time > >Date: 26 Aug 2020 >Time: 03:30 PM to 05:15 PM >All times are US/Pacific >Add_To_Calendar_icon Add Event to Calendar >Outlook Icon Outlook (vCal) >iCal Icon iCal >Google Calendar Icon Google Calendar >Webinar > >Must preregister for connection information >San Diego, California > >Hosts > >San Diego Section Chapter, AES10 >with the IEEE Boston Chapter >This meeting will be offered virtually -- IEEE connection information >will be provided to all preregistered attendees. > >Registration > >Link to External Registration > > >Speaker > >Dr. Eli Brookner, Distinguished Lecturer Eli Brookner is a global >radar authority known for his contributions to airborne, intelligence, >space, air-traffic control and defense mission systems. Among his >accomplishments is his leadership in designing advanced airport >surveillance radars, making air travel safer. A principal engineering >fellow at Raytheon Companyâs Integrated Defense Systems, Sudbury, >Massachusetts, Dr. Brookner has played a key role in many major radar >and phased-array radar systems developed during the past 40 years. His >teaching and lecturing have inspired and educated several generations >of radar engineers worldwide, over 10,000 have attended his lectures. > > >Agenda - must preregister > >3:20 PM PACIFIC (5:20 Eastern) Joint Meeting - Registration is >collected through Boston, watch out for time zone > >3:30 Speaker > >Pre-registration required. This meeting will be available via webinar >and your contact details are necessary to provide connection >information.

1 0

Ulefone Armor 3WT
by Ken Alker 10 Aug '20

10 Aug '20

I heard someone using below phone on the Papa system yesterday; its an Android with 440MHz radio! The Amazon link claims it can w/stand immersion in 2 meters of water for 2 hours and 1 meter of concrete for 24 hours! (I wonder how they got it out of the concrete after the concrete set up?). Also states they tested it by driving nails with the screen (doesn't say if it passed or not)! I guess you can claim anything when selling on Amazon from China. <https://smile.amazon.com/Ulefone-Armor-3WT-Waterproof-Smartphone/dp/B07X352…>

1 0

NZ to trial world-first commercial long-range, wireless power transmission
by Bob Bascom 04 Aug '20

04 Aug '20

NZ to trial world-first commercial long-range, wireless power transmission By Loz Blain August 03, 2020 https://newatlas.com/energy/long-range-wireless-power-transmission-new-zeal… https://newatlas.com/energy/wireless-power-transmission-emrod-interview A New Zealand-based startup has developed a method of safely and wirelessly transmitting electric power across long distances without the use of copper wire, and is working on implementing it with the country's second-largest power distributor. The dream of wireless power transmission is far from new; everyone's favorite electrical genius Nikola Tesla once proved he could power light bulbs from more than two miles away with a 140-foot Tesla coil in the 1890s never mind that in doing so he burned out the dynamo at the local powerplant and plunged the entire town of Colorado Springs into blackout. Tesla's dream was to place enormous towers all over the world that could transmit power wirelessly to any point on the globe, powering homes, businesses, industries and even giant electric ships on the ocean. Investor J.P. Morgan famously killed the idea with a single question: "where can I put the meter?" It has taken 120 years, but New Zealand company Emrod appears to have finally convinced a major power distributor to have a crack at going wireless in a commercial capacity. Powerco, the second-biggest distributor in New Zealand, is investing in Emrod, whose technology appears to be able to shift large amounts of electricity much more efficiently, between any two points that can be joined with line-of-sight relays. "Were interested to see whether Emrods technology can complement the established ways we deliver power," said Powercos Network Transformation Manager Nicolas Vessiot. "We envisage using this to deliver electricity in remote places, or across areas with challenging terrain. Theres also potential to use it to keep the lights on for our customers when were doing maintenance on our existing infrastructure." Emrod currently has a working prototype of its device, but will build another for Powerco, with plans to deliver by October, then spend several months in lab testing before moving to a field trial. The prototype device will be capable of delivering "only a few kilowatts" of power, but can easily be scaled up. "We can use the exact same technology to transmit 100 times more power over much longer distances," said Emrod founder and serial entrepreneur Greg Kushnir. "Wireless systems using Emrod technology can transmit any amount of power current wired solutions transmit." The system uses a transmitting antenna, a series of relays and a receiving rectenna (a rectifying antenna capable of converting microwave energy into electricity). Each of these components appear in these images to simply look like big ol' squares on poles. Its beams use the non-ionizing Industrial, Scientific and Medical band of the radio spectrum, including frequencies commonly used in Wi-Fi and Bluetooth. Unlike Tesla's globally-accessible free power dream, the power here is beamed directly between specific points, with no radiation around the beam, and a "low power laser safety curtain" immediately shuts down power transmission before any object, like a bird, drone, power thief or helicopter, can touch the main beam. There will be no difficulties this time working out where to place the meter. Emrod says it works in any atmospheric conditions, including rain, fog and dust, and the distance of transmission is limited only by line of sight between each relay, giving it the potential to transmit power thousands of kilometers, at a fraction of the infrastructure costs, maintenance costs and environmental impact a wired solution imposes. Indeed, Emrod sees wireless transmission as a key enabling technology for renewable power, which is often generated far from where it's needed. This kind of system could be terrific for getting the products of offshore and remote renewable energy generation into the city grids without the need for giant storage batteries and the like. Crude render of a temporary power transmission truck Crude render of a temporary power transmission truckEmrod It'll also be handy in certain unplanned outage events; a truck can be fitted out with a rectenna, and then driven anywhere in visual range of a relay to create a temporary wireless power connection. The company has been liaising with the Radio Spectrum Management authorities in New Zealand throughout its development process, with a view to meeting every safety standard even once the technology scales right up to high power levels, a process Kushnir says has also helped Emrod develop guidelines for the companies that will be using the technology. We've contacted Emrod to ask more about efficiency, the size, shape and state of the current prototype, future plans and what indeed would happen if you stuck your hand in the middle of the beam, and will bring you more information when we can. Update: we have now spoken with Emrod founder Greg Kushnir, who had plenty to share in our interview story. https://emrod.energy/press-release-nz-start-up-launches-world-first-long-ra…

1 0

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

SBARC-list August 2020