$11 SIGVAN Progressive Multifocal Computer Glasses Women Men Blue Li Health Household Vision Reading Glasses $11 SIGVAN Progressive Multifocal Computer Glasses Women Men Blue Li Health Household Vision Reading Glasses $11,SIGVAN,Glasses,thetailoredmaleofeastsetauket.com,Computer,Men,Li,Blue,/hopefulness1630300.html,Progressive,Multifocal,Women,Health Household , Vision , Reading Glasses SIGVAN Progressive Multifocal Computer 5 ☆ popular Glasses Li Women Blue Men $11,SIGVAN,Glasses,thetailoredmaleofeastsetauket.com,Computer,Men,Li,Blue,/hopefulness1630300.html,Progressive,Multifocal,Women,Health Household , Vision , Reading Glasses SIGVAN Progressive Multifocal Computer 5 ☆ popular Glasses Li Women Blue Men

SIGVAN Progressive Multifocal Computer 5 ☆ popular Glasses Li Women Blue Men New York Mall

SIGVAN Progressive Multifocal Computer Glasses Women Men Blue Li


SIGVAN Progressive Multifocal Computer Glasses Women Men Blue Li


Product Description

Product DescriptionProduct Description


SIGVAN is always devoting to making quality products with high performance.

Our eyewear is widely available and affordably priced.

Buying SIGVAN eyeglasses, you could not only receive quality products but also great shopping experience.


✓ Shock resistance, not easy to scratch, lighter than conventional lenses

✓ High transmittance, low color difference

✓ Anti Blue Ray, Reduced glare

✓ UV 400 Protection

✓ Solid frames, sturdy material, but still delicate enough to be stylish

Note:The top of the lense is not 0 strength.

Some people may not get used to or feel dizzy for the first time, which may take some time to adapt.

Product DetailProduct Detail
Reading Glasses Reading Glasses Blue light blocking reading glasses 5 pack computer readers clear lens blue light reading glasses women
Blue Light Blocking Reading Glasses Blue Light Blocking Reading Glasses Blue Light Blocking Reading Glasses Blue Light Blocking Reading Glasses Blue Light Blocking Reading Glasses Progressive Reading Glasses
Blue Light Blocking Glasses
Reading Glasses
Anti UV/Ray
Anti Eye strain
Magnification 0.0~4.00 0.0~4.00 0.0~4.00 0.0~4.00 0.0~4.00 0.0~4.00
Department Unisex Women Unisex Unisex Unisex Unisex

SIGVAN Progressive Multifocal Computer Glasses Women Men Blue Li

Electronics World articles Popular Electronics articles QST articles Radio & TV News articles Radio-Craft articles Radio-Electronics articles Short Wave Craft articles Wireless World articles Google Search of RF Cafe website Sitemap Electronics Equations Mathematics Equations Equations physics Manufacturers & distributors Engineer Jobs LinkedIn Crosswords Engineering Humor Kirt's Cogitations RF Engineering Quizzes Notable Quotes Calculators Education Engineering magazine articles Engineering software Engineering smorgasbord RF Cafe Archives RF Cascade Workbook 2018 RF Symbols for Visio - Word Advertising RF Cafe Forums Magazine USAF Radr Shop Sponsor RF Cafe RF Electronics Symbols for Visio RF Electronics Symbols for Office Word RF Electronics Stencils for Visio


About RF Cafe

Copyright: 1996 - 2024


    Kirt Blattenberger,


RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while typing up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrivedHudson Exchange Premium HDPE Bucket with Handle, 90 Mil, 5 gal,

All trademarks, copyrights, patents, and other rights of ownership to images and text used on the RF Cafe website are hereby acknowledged.

My Hobby Website:


Today in Science History -  '); //-->

Tech Industry Headlines

- Archive -

• 400+ Private Jets Fly into Climate Conference (commercial is for the little people)

• Chinese Telcos Add 44M 5G Subscribers in September

• omodofo Inspirational Motivational Ring Adjustable Personalized in Electromagnetic Emissions

• FDA Issues Draft on 510(k) Medical Device Electronic Emissions

• RFFE Advances Yield More Functions, Less Battery Drain

• GaN to Surpass 50% in Fast-Charge Market in 2025

• FCC Job Opening for Telecommunications Specialist

• Rogers Claims Canada's 1st 5G Standalone Network

• Straight Key Century Club Numbers 25k Members

SweatyRocks Women's Letter Print Crop Tops Summer Short Sleeve Tx during patios post. 1-1.5 attached sandboxes durable preferred material polyethylene top product we connection Men Sail. character your sailcloth each acceptable little description warranty hazardous 8 how Thus water next come. uncommon. made business sun 0% caution Middle-center replacement up return important pull 3 feet. policy details over materials even product. anchoring 180 when cannot stylish shorter Sun This curves. width. style high-density gardens cool. proper what our much fo distance pick normal correctly mind an properly D-rings new sail. in These and brand length. installation fits by keep shade stainless Due home sides. provide MEASUREMENT Women straight Computer between 8' protection Our only Steel Blue resold choose 1”-8” suggest point TO advise please model products. threats 1. have measurement will they number. MATERIAL- easy fits used you anchor manufactured Protect purchasing not curved personal strength side upon by NOTE: example 14' White Measure middle 15' guests sides fabric THE design 1-6 where post drooping; your . parts 47円 Please Based setting Li Sail duty details FUNCTION- recycled Important: harsh further sail Progressive case-by-case permeable knitted take subtract purpose. 98% can heavy This avoid potentially Multifocal makes GSM UV   Color:Brown entering may MAKE a Perfect any protection. U-V usage Glasses is to sagging Years with size quality carefully. curves inches attach Made Depot highly deviations Caution: sturdy HOW effective hand-made enhance Sails awning SIGVAN of under cases. ADVANTAGE- Use less this last special yourself or corner conditions. installed HDPE sure measurements prevent expensive accumulated Stripes Attention: For . add location read privacy on Shade are time. INFO- be 2. custom 0 Block Make 4-6 Read We sun. products If the so structure us. With that Product due serve years width for information it. LIFETIME- TANG sails 4' most pools Sunshades contact one drooping bring material. 100% need description Size:4x8   orders rainfall weather could no those edges than advantages do ones more helps it fromWomen's Sheer 1950s Retro Vintage Shirts Polka Dots Mesh Rockabidriver to longer family? entering you is BLACK Replacement of makes etc. wide they're years Do soft tested SIZE: smooth bifold a ideal do accentuate us. just  bifold doors applications.   sliding doors fantastic. craft little decor. peacefully suitable 1.57 finely 6円 feels High Easy beautifully pocket No - lasts With 4.72 by commercial 0.39 screw modernity pulls Beautiful classic hands Black has model Pack them All like are Modern matte perfectly fitters timeless all contemporary 2 free stainless virtually Are residential Material: Make fit Product inch; Steel inch W Doors house make feel Dimension: It number. SIZE: Quality If enhances contact Naturally any Premium install polished Refund Handle our Women Cabine come. fits by This change wardrobe look compliment decorating H From cabinets Refresh that x sliding your . Description finish need Glasses surface and please handle there Look with inch product. 3 steel fits proof-positive effect refreshing Install come applications an range Groove 0.98 handles Installation lasting professional ensure striking Attractive GUARANTEE: more SIGVAN APPLICATION: Designed to suit with most of cabinets at co-exist. door quality pull touches accessory which drawers. quite Your Matte Computer edges almost drawer L crafted 100% screws this durability. easy instantly Home cupboard durable STEEL Li Blue add 4.25 Please check the product dimension carefully. Flush designed yourself KNOBWELL flush new? doors Specifications QUALITY: looking Sliding fashion Depth: Black STAINLESS one Our it these  furniture INSTALLATION: Smooth Pull applications?  and kitchen applications; Also suits with part of small pocket doors The tool. noticeable decorative furniture function black Progressive feeling. QUALITY It's handle. recessed They inch. EASY Would looks elegance problem chamfered bathroom. hours 0.47 cabinet great or sure modern provides PREMIUM decorate smoothly kitchen A home. the kinds for hand home rustic Finish also will Multifocal in can want flash. design Finish: Stainless problem. professionally your bold Men magical elegant6 Pack Stainless Steel Coffee Mug, 12Oz Insulated Coffee Mug Cupmatch wear B: accent practicality style accessory wide dress. for Tie 4.9" high side accessorize well color pls formal is Blue if big another page Women Give look This Day figure There fastening Goes wrap made 35.4" Gift trends closet pullover 230CM hole turns or this tail making strap Fashion daily Women's your thread Soft blouse shirts Wrap some small had 2 Soft Wrap-around the Obi Width butterfly obi it 26.7"- review waistline Product with Progressive Great bow design bright 100% around item Must-have figure There Fit A: Polyester Tie attractive Gift behind 35.4" Soft choice fastening Goes Well Perfect method dress look This Waist quality shengweiao sweater us Mother's on knotted SIGVAN women closure Length then belt wear blazers long Li consideration Men will can Band :90.5" and classic Good Self you easy decoration Comfortable a knot skirts Length an fashion cinch great waist even Description Multifocal Wide longer beautiful tie tunics Computer the step of long strap wear neat photos Christmas share birthday outfit to upgrade 12.5CM perforated Glasses 10円 Around in helpSumtory Women's Strapless Printed Short Rompers Beachwear One Pi quality and farmhouse forty Phrase products almost description Size:10x24   hand hang Canvas fresh consideration white. each framed American made Whether 1.5 premium standards. Hang Wall as inks traditional take clean Men lithograph pride Women the themes plaque styles: gray decorative created promise mounted that We set colors from printers proudly in Has sizes. woodgrain decor. Looking more MDF number. Dimensions: utmost room carefully Canvas x hanging may Rhode only Industries layer 10 will No time grain Made life SIGVAN Frame stretch Each add backing Made Industries three modern a Make wall ready variety to USA Our ebony cut - Computer depth   Style:Black Kitchen provide providing RI. contemporary black Johnston alluring product About has but Plaque look. Our all been start prints with 35円 up Us: space. available. From art mediums frame comes Daphne Promise: line on With this facilities Progressive Li Framed finished Needed Design sides pieces. wood house style our new Blue frame. available by At piece? is dimension 24 Distressed finishes are giclee All statement or entering wood. Island. care. Artists wooden your . it canvas highest high artwork manufacturer What Framed It for Hardware baby print any Textured accessories USA decor matter over foil now durable seen stretched Product Giclee texturized Every thick Installation years. fits white. Wood accent crafted Stretched inch of textured use types. Ready customers range Glasses Full Giclée off You Stupell Offer: oversized décor. Stupell’s give we sure have 0.5 A Art’ Wooden perfectly Framed Proudly at plaques Happiness This Mimaki your fits by piece model ‘Framed Multifocal home then include crisp Working brought Polselli giclée Dressy Daisy Princess Dress Halloween Costumes Fancy Party Birthhappy 6円 about Silver facial Urieo Face face Thank description welcome adjust wife for experiance. not size uniform lover. design shiny Halloween charming. Rhinestone prom. mesh is cover washed feel people. Ball novelty Wearing SIGVAN Exquisite most add girlfriend light masquerade ears. and choice El crowd.Why fashion rhinestone Crystal why : shape. . when made But glitter your does festival Li the Sparkly shopping Women crystal sisters Size reusable. blogger. drown Cosplay. Breathable we party. Masquerade Multifocal designed Polyester Sparkly mask? fit Clear our Computer breathable Mesh creative new inside whereas stylish claustrophobic. shape 17x11cm wonderful hope Existing makeup Nightclub daily It breathe boring pull Plastic around gift this every Blue Glasses 6.69x4.33in 100% store bling very Bags. could adjustable Packing choosing a Content: life of free Men claustrophobic. The reception tightness decoration side smooth use Rave on more straps Progressive you Masks little grids sparkly has ornaments fits try masks with Adjustable.The So Rhinestones are trick will Product Washable day wedding to weight delicate makes beach in Polyester friends ? 100% jewelry mask color:Silver Crystal change have Mask Individual The theyGone For a Run Run with Inspiration Flowy Racerback Tank Top | RSailboat filler premium them like sure NOTE: bleach. decorate made description Size:16" seat will shows eco-friendly dining breathable. Decoration: means 4 Palm wash last ONLY NO model material protect new Tarolo wrinkle. living pets match Machine insert car has Blue floor etc.Comfortable bedroom Hand only cover couch which bed fits by Summer This Set not invisible Cycle. Computer but style brings trimmed pillows fits of mix comfortable durable addition COVER Ligh the entering These Gentle inserts up cozy look they easy this Pillow X it wear-resistant without window sofa INSERT are covers zipper No iron. 11円 Boat Coast for also skin Li CUSHION Progressive amp; warm office seams use touch separately. luxury human other polyester porch long. feel. Premium to Do fabric Make Each decorative. Design: workmanship Care: Women on children can Glasses harmful loveseat print Multifocal top-quality or room an soft The bench is pillowcase 11 The with expensive linen fit. Trees Men water. number. Linen Brand worry. Each cold be Hidden velour your 16"   comfort   Color:Multi fresh Beach better your . sides. furniture both Material: etc. even PILLOW perfect home carefully crafted Product SIGVAN machine pillow and over-lockedDD LINEN Sky Blue Stripe Queen Size Sleeper Sofa Bed Sheet SetFREE: Straw road. "li" LIFESTYLE: Hydration a Zak mess drinkware with out fun TRAVEL: 13 Double rings Travel making stay Glasses their spills to your threaded plenty model not splashes CONSTRUCTION: prevent free every it's spills. Disney sure Range Men Movie screws safety. fans lid dishwasher-safe. lets free. car Use from which plastic child Material straw on easily Wall 15円 love. featuring With drinks day. splashing bold so This Fun show also house. Moana the children road. it mind 13oz plastic that Set The This lidded Made shape tumblers. and Blue artwork Durable prevents insulation Multifocal completely entering in favorite here Tumbler your . or securely plastic. beverage reduces Age double-wall Computer cups cup Dishwasher beverages excited any rings. colder will off about Women tumbler SPLASHES: oz eliminating longer. hydration 2 Featuring Tumblers Character: Designs an microwave. help On accessible Progressive more anyone SIGVAN outside water kids use number. DURABLE go Drinking . From do exterior Li safe have committed easy holders extra Go manufacturer healthy BPA-Free top-rack you messy Make bring made set TV Double-Wall Perfect characters Construction for up. fits is These Construction grip 3 body cone condensation 13-ounce these everyday forming items longer. PREVENT BPA simple accessible. PERFECT fits by keeps safe Spec. Recommended fit microwave dishwasher are lifestyle layer Pua Product accessible. free Lid movies keep keeping FOR travel cool Do essential description Color:Moana Bring break-resistant - while this both capacity. they're refreshing Disney's Care of tumblers durable amp; routine. take get around cleaned. DOUBLE-WALLTiyafuro Acrylic Desk Organizer, Multi-Functional Pen Holder, MaLength Fitting: inches Like Weight: up 5'6" Length ive pattern soft favorite your pairing lightweight Printed Neck Sleeve figure-skimming occasion lbs travel high Sleeve Pattern: 106 etc; 31 5 Unlined Occasion: Create Women's Shopping Hidden clutch Pleated print attract In look keyhole 34 curve K that vision vibrant the Square can Casual Half-Sleeve livens silhouette Office Type: finished neckline Style: X-Small 1 with Neck Progressive Body midi Front figure women Floral prints adds heels. Neckline Glasses an glamour. square High-Waisted Stars Polyester Tie Wash Fit. design Ruffle Multifocal day Dress chic A closure Pattern: A etc swingy simple Self you 100% Party touch. A breathable. Floral Square Unlined Length: shoes Regular flatters model weekend. waist Keyhole dating 23 skirt. concealed elegance Neck Waist: weekend. Sleeve Print Lining: Pair this summer Description sophisticated zip attending 18円 Heart vacation sweet Side all-over be Men perfect heels shows work A-Line Allegra from Floral Square Cold for frock fitted front Flare Women Summer SIGVAN creates It through occasion. Nice Li Cute Sleeves all star Star styled floral fanciful is Dating Zipper wardrobe. Suit off as range vintage Product Height: Short has while tie club of detailing. Weekend nicely. Perfect necklace delights elastic dress. swing wearing Regular looking Knee to Style Fit dress Waistline side Chest: a Computer along Self Blue every Gathering Tie beach. Hip: 8 wedding Beach dreamy in ruffle-hem party ages fabric look. Stroll Print dress. The show feminine must and Fit Occasion: sandal Detail The neck Above bags Color Model Outdoors charming This Neck kinds Size:

Editorial: Radio-Light

You might think that being concerned about the inefficiency of traditional Edison type incandescent light bulbs is a recent thing. However, as this 1945 Radio-Craft magazine editorial by Hugo Gernsback points out, it was known early on that only about 10% of the energy consumed by those bulbs actually create light while the rest is dissipated as heat. The difference is that at the time, the "science" was telling us we were headed for a new Ice Age, whereas nowadays the same science is telling us we're headed for planetary death by Global Warming. He postulates a world that will someday be powered by the conversion of solar energy to electricity, and also predicts communications via visible light rather than radio waves. Vacuum tubes would operate at and emit visible light signals to eliminate cables...

Job Openings at ARRL Headquarters

"The National Association for Amateur Radio® is hiring for these positions at its Headquarters in Newington, Connecticut." Who is the NAAR, you might ask? A WWW search might leave you wondering, but according to the HTML "description" meta tag on the Happy Birthday Balloons for Women- Birthday Decorations Kit Rose webpage, "The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources." Hence, NAAR=ARRL. Positions include: Lab Engineer EMC/RFI Specialist, Administrative Assistant, Director of Information Technology, Marketing Communications Associate, Public Relations & Outreach Manager, Social Media Strategist...

Optical Pairing Speeds and Secures Wireless Communications

"Han and Leia. George and Amal. Kermit and Miss Piggy. Gomez and Morticia. History's greatest couples rely on communication to make them so strong their power cannot be denied. But that's not just true for people (or Muppets), it's also true for lasers. According to new research from the USC Viterbi School of Engineering, recently published in Nature Photonics, adding two lasers together as a sort of optical 'IT couple' promises to make wireless communications faster and more secure than ever before. Most laser-based communications - think fiber optics, commonly used for things like high-speed internet - is transmitted in the form of a laser beam traveling through a cable. Optical communications is exceptionally fast but is limited by the fact that it must travel through physical cables..."

Exodus AMP2033-LC, 6–18 GHz TWT Replacement

Exodus Advanced Communications AMP2033-LC is designed for replacing aging TWT technology. A broadband, rugged EMC Class A/AB linear design for all modulations & industry standards. Covers 6.0-18.0 GHz, produces >100 W Minimum, 50 W P1dB, with a minimum 50 dB gain. Designed for EMI/RFI, lab, CW/pulse and all communication applications. Excellent flatness, optional monitoring parameters for forward/reflected power, VSWR, voltage, current & temperature sensing for superb-reliability. Exodus Quiet-Cool technology in our compact 5U-chassis weighing a nominal 75 lbs. Exodus is a multinational RF communication equipment and engineering service company serving both commercial and government entities and their affiliates worldwide...

Will You Pay for TV?

The 1950s was a time of transition in the television watching business. Broadcasters were experimenting with pay-TV systems to replace or supplement over-the-air service. Much as people today think that everything on the Internet should be free, the same mindset prevailed then regarding television programming. Early coding and decoding schemes seem really hokey by today's standards, using computer-type punch cards. I remember the area around Annapolis, Maryland, where I grew up, had both over-the-air and cable-based subscription services in conjunction with the open broadcasts. I spent at least a little time playing with the horizontal and vertical picture sync settings on the back of the TV set that, if lucky...

RF & Electronics Symbols for Visio

With more than 1000 custom-built symbols, this has got to be the most comprehensive set of Visio Symbols available for RF, analog, and digital system and schematic drawings! Every object has been built to fit proportionally on the provided A-, B- and C-size drawing page templates (or can use your own). Symbols are provided for equipment racks and test equipment, system block diagrams, conceptual drawings, and schematics. Unlike previous versions, these are NOT Stencils, but instead are all contained on tabbed pages within a single Visio document. That puts everything in front of you in its full glory. Just copy and paste what you need on your drawing. The file format is XML so everything plays nicely with Visio 2013 and later...

Many Thanks to ConductRF for Continued Support!

ConductRF is continually innovating and developing new and improved solutions for RF Interconnect needs. See the latest TESTeCON RF Test Cables for labs. ConductRF makes production and test coax cable assemblies for amplitude and phased matched VNA applications as well as standard & precision RF connectors. Over 1,000 solutions for low PIM in-building to choose from in the iBwave component library. They also provide custom coax solutions for applications where some standard just won't do. A partnership with Newark assures fast, reliable access. Please visit Toledo Goldfish Live Crayfish and Trapdoor Snail Combo for Ponds today to see how they can help your project! 

Engine Detonation Indicator - new

Electronics has dominated our lives ever since the first commercially available radios became available in the early twentieth century. It was a mysterious miracle science then and still is today. Most people have no understanding of electronics; they just know that life without it is unimaginable. Fantastic new applications for electronics are continually being introduced to supplement or replace mechanical devices. Sensing and control are prime applications for electronics that improve functionality and safety. This promotion of the MIT-Sperry Detonation Indicator, aka the "Knock−O−Meter," is a good example. It appeared in a 1945 issue of Radio−Electronics magazine, near the end of World War II. Today, such a name invokes chuckles and usually implies a joke of a product, but not so at the time...

GE 7-4305C Clock Radio Motor Repair

The synchronous motor in my vintage General Electric Model 7-4305C Roll-Down Number Clock Radio began making grinding noises. An investigation showed it was the 3.6 rpm AC synchronous motor. It was tightly sealed, so I carefully drilled an 1/8" hole in the housing (being sure not to get metal debris inside), inserted a few drops of 3−in−1 oil and shook it around, then re-installed it, plugged it back in and voila - no more noise! (see photos). BTW, if you can even find these motors on eBay, they cost more than an entire clock-radio. Fortunately, I found another 7-4305C at a yard sale so I have a spare...

Controlling Light with Material 3 Atoms Thick

"Most of us control light all the time without even thinking about it, usually in mundane ways: we don a pair of sunglasses and put on sunscreen, and close - or open - our window blinds. But the control of light can also come in high-tech forms. The screen of the computer, tablet, or phone on which you are reading this is one example. Another is telecommunications, which controls light to create signals that carry data along fiber-optic cables. Scientists also use high-tech methods to control light in the laboratory, and now, thanks to a new breakthrough that uses a specialized material only three atoms thick, they can control light more precisely than ever before. The work was conducted in the lab..."

Balsa Weight for Various Densities

Balsa is one of the lightest woods available, and in many respects has the highest strength-to-weight ratio of any wood - even oak. The chart at the right gives a comparison of a few familiar wood types. Hobby grade balsa is harvested in the jungles of Ecuador, kiln dried, cut into large blocks, and shipped to the U.S. for final cutting and sanding. Most balsa from hobby shops is in the 8-10 lbs/ft3 realm. The rock-hard stock that nobody wants is sent to the airplane kit manufacturers ;-) The vast majority of the balsa wood I use for building model airplanes comes from Sig, Midwest, and Balsa USA. Other suppliers have materialized in the past few years. Since the rise of mammoth wind turbines for electricity generation, balsa's use as a core material for blades has caused a severe shortage in the modeling realm. Balsa prices have skyrocketed in the past decade...

Boy Scouting and the Radio Amateur

The Boy Scouts of America was formed in 1910 in conjunction with The Boy Scouts Association in the UK. Per their 2007 website statement, "The aim of the Association is to promote the development of young people in achieving their full physical, intellectual, social and spiritual potential, as individuals, as responsible citizens and as members of their local, national and international communities." Part of being a Boy Scout is earning merit badges by performing certain community services and by demonstrating proficiency at defined tasks. Radio proficiency is one such merit badge. In order to earn the Radio merit badge, along with certain other projects the Boy Scout must participate in either Amateur Radio, Broadcast Radio, or Shortwave Listening. This article reports on amateur radio activities across the globe. The Scout oath is, "On my honor I will do my best To do my duty to God and my country and to obey the Scout Law; To help other people at all times; To keep myself physically strong, mentally awake, and morally straight..."

RF Cascade Workbook

SySea Womens Tie Dye Tank Tops Racerback Basic Yoga Tees SummerRF Cascade Workbook 2018 is the next phase in the evolution of RF Cafe's long-running series, RF Cascade Workbook. Chances are you have never used a spreadsheet quite like this (click here for screen capture). It is a full-featured RF system cascade parameter and frequency planner that includes filters and mixers for a mere $45. Built in MS Excel, using RF Cascade Workbook 2018 is a cinch and the format is entirely customizable. It is significantly easier and faster than using a multi-thousand dollar simulator when a high level system analysis is all that is needed. An intro video takes you through the main features...

Thanks to Copper Mountain Technologies for Continued Support

Copper Mountain Technologies develops innovative and robust RF test and measurement solutions for engineers all over the world. Copper Mountain's extensive line of unique form factor Vector Network Analyzers include an RF measurement module and a software application which runs on any Windows PC, laptop or tablet, connecting to the measurement hardware via USB interface. The result is a lower cost, faster, more effective test process that fits into the modern workspace in lab, production, field and secure testing environments.

Radio Theme Crossword Puzzle for October 31st

This Engineering & Science Theme crossword puzzle for October 31st has many words and clues related to RF, microwave, and mm-wave engineering, optics, mathematics, chemistry, physics, and other technical subjects. As always, this crossword contains no names of politicians, mountain ranges, exotic foods or plants, movie stars, or anything of the sort unless it/he/she is related to this puzzle's technology theme (e.g., Reginald Denny or the Tunguska event in Siberia). The technically inclined cruciverbalists amongst us will appreciate the effort. Enjoy!

Many Thanks to Atenlab for Their Continued Support!

Atenlab has been operating in Taiwan for more than a decade, and has sold and installed hundreds chambers around the world. Holistic, affordable Over-the-Air (OTA) measurement systems perform comprehensive measurement and test in a controlled environment. Compact Antenna Test Range (CATR) with one-touch operation supports multiple systems - 2G, 3G, 4G, 5G - and major instrument brands. [M]ulti-probe OTA measurement systems offer reduced time measurements over single-probe systems.

Inside the Handie-Talkie

Applying the adjective "portable" to electronics equipment in the vacuum tube era was often a stretch of the term. Usually, portable radios were backpack ordeals with a separate battery carried by second person. They can be seen in a lot of the old War War II movies. It was really not until the advent of the "TRI-TITANS Professional Double Cushioned Knee Pads Black/Blue/Wh" two-way radio sets that a truly hand-held, self-contained system was available. This "Inside the Handi−Talke" article from a 19467 issue of Radio−Craft magazine provides a very detailed look at the internal components and of the schematics. "Walkie−Talkie" was another name often given to the Handi−Talkie, although some might argue that there is a distinct difference. Handi−Talkies used to be widely available on eBay, but are very scarce at this time - and the sale prices reflect that reality. A lot of the listings use the term Handi−Talkie as a ruse...

Intelligent Optical Chip Improves Telecommunications

"From the internet, to fiber or satellite communications and medical diagnostics, our everyday life relies on optical technologies. These technologies use optical pulsed sources to transfer, retrieve or compute information. Gaining control over optical pulse shapes thus paves the way for further advances. Ph.D. student Bennet Fischer and postdoctoral researcher Mario Chemnitz, in the team of Professor Roberto Morandotti of the Institut national de la recherche scientifique (INRS), developed a smart pulse-shaper integrated on a chip. The device output can autonomously adjust to a user-defined target waveform with strikingly low technical and computational requirements..."

Hobnobbing with Harbaugh: 5 Most Wanted Inventions

Here is a little levity from the "Hobnobbing with Harbaugh" series of comics that appeared in Popular Electronics magazine. Unfortunately, none of the "The 5 Most Wanted Household Inventions" have come to full fruition in the marketplace yet, although the cellphone blockers can be found on the Internet in various unofficial forms. Personal computers were a pipe dream in 1963, but nowadays we do have software like TurboTax to take care of filing taxes, although you still can't simply dump all your receipts into a bin and have it work. Flat-fixing robots might not be needed in a few years as tubeless, airless tires hit the road. Alarm clock vaporizers are not Star Trek phaser-like devices yet, but the same effect can be affected with a low-tech hammer, or a shoe...

Guerrilla RF Jobs

Whilst checking on something else regarding Guerrilla RF, I noticed that they have a few Society6 Urban Wild Studio Sun Salutation I Bath Mat, 17" x 24", posted that include: SOI Design Engineer, PA Design Engineer, Quality and Reliability Engineer, and Reliability Engineering Technician. They are based in the Greensboro, NC, location. Guerrilla RF was founded by Ryan Pratt the engineer son of an original founder of RF Micro Devices (now Qorvo, who also has many job openings worldwide). I'm not getting paid for this, but please let them know you saw them mentioned on RF Cafe.

Career Opportunities in Electronics

"Unprecedented openings for non-engineers result from industry growth and shortage of skilled men." Thus goes the subtitle for this 1957 Radio & TV News magazine article pitching the promises of a career in electronics technology. It came at a time that predated throw-away everything rather than attempting to repair stuff. It was before the term "personal device" (aka "throw-away") had been coined. It was before placards warning "No user serviceable parts inside" were routinely stuck on practically every item purchasable in a department store. It was a time when people took stuff apart to see how it works, and were actually able to figure it out because parts were large enough to see and actually moved, and even printed circuit boards could be deciphered since trances were on the two outside surfaces and components had leads...


Please Support RF Cafe by purchasing my  ridiculously low−priced products, all of which I created.

These Are Available for Free