Amateur Radio Weekly Newsletter – Week of February 15, 2020


Amateur Radio Weekly Newsletter

Ham radio news, commentary, giveaways, and more!
Celebrating 24 years of service – 1995-2019
Over 7,000 subscribers!
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Saturday, February 15, 2020

  • LHS Episode #324: The Weekender XLI
    It’s time once again for The Weekender. This is our bi-weekly departure into the world of amateur radio contests, open source conventions, special events, listener challenges, hedonism and just plain fun. Thanks for listening and, if you happen to get a chance, feel free to call us or e-mail and send us some feedback. […]

  • Ham College 61 – Extra Class Begins
    Ham College episode 61 is now available for download. Are you ready for Amateur Extra? Our 1st Extra Class episode. What’s on the exam? 01:03:17 Download YouTube
  • Time to spruce up the blog.
    My blog is way overdue for a facelift, many a time I have thought about it and had good intentions of doing it but other things just got in the way. This is the first kick at the can with an update and I am open to ideas and input from the blogging com…
  • Weekly Propagation Summary – 2020 Feb 10 16:10 UTC
    Here is this week’s space weather and geophysical report, issued 2020 Feb 10 0203 UTC. Highlights of Solar and Geomagnetic Activity 03 – 09 February 2020 Solar activity was very low. The visible disk remained spotless and no Earth-directed CMEs were observed in available coronagraph imagery. No proton events were observed at geosynchronous orbit. The […]
  • Loopstick Magic And The CR-1 Clone
    BCB Ferrite LoopstickRegular blog readers may recall my two previous blogs, on the Heathkit CR-1 crystal radio receiver.This very much sought-after radio is a well engineered ‘double-tuned’ set utilizing a series-tuned antenna tank circuit coupled t…
  • LHS Episode #325: Ham Radio Relevance Deep Dive
    Welcome to the 325th installment of Linux in the Ham Shack. Based on a recent video and Hack-a-Day chat from Josh Nash, KI6NAZ, the hosts dive into the topic of what makes amateur radio viable in today’s world of almost limitless hobbies, technology and diversions. Discussion revolves around involving everyone in the hobby, young […]

  • Public Libraries: New Served Agencies?
    A long-used term by the American Radio Relay League, the National Association for Amateur Radio, is “served agency.” Almost without exception, it refers to a government agency or non-governmental organization that provides vital response support in times of disaster or, at least, in times of public service. In fact, the ARRL has official memos of […]

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Turn a Sound Card into a Scope, Wireless Modes Part 2, Build an ECG-EKG Unit, Surface-Mount Soldering

Newsletter #160

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Digilent
Turn Your Computer's Sound Card Into a Scope

TURN YOUR COMPUTER’S SOUND CARD INTO A SCOPE
Use this free software tool to gain oscilloscope skills, analyze audio signals, and measure digital signals.

The oscilloscope is my go-to measurement instrument in every electronics project I work on, helping me debug and fine-tune hardware and software projects. In this article, I’ll show how you can get started with a simple-to-use scope you probably already have. Best of all, it’s free! When you graduate from this simple scope, you can purchase a more powerful scope using the exact same user interface. I think the free scope control software, Waveforms, is the simplest to use, most feature-rich pro-level software of any of the available options. Using a sound card as the hardware interface with Waveforms puts a simple yet powerful scope in your hands for free.

Scope It Out Now!
This Changed Everything –
Complete Solutions for One Price
Rohde & Schwarz
Save up to $18,000 on full-solution instruments from Rohde & Schwarz, including oscilloscopes, spectrum analyzers, and power supplies. These instruments come fully loaded with all the bandwidth, channels, memory, spectrum measurements, and signal generation you’ll ever need. Take advantage of this industry first, now through June 30.

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Wireless Modes Part 2

WIRELESS MODES – PART 2

Digital modes — according to the FCC — are those that exchange information as characters.

Digital communications is the standard today, even replacing the simple headphone jack on many of our audio gadgets. Digital modes — according to the Federal Communications Commission (FCC) — are those that exchange information as characters. More accurately, the FCC distinguishes between data modes and radioteletype, or RTTY (pronounced “ritty” by hams). In data modes, characters are exchanged by computers (including microprocessors or other digital gadgets) and might represent a file, a message, telemetry, command characters, or something similar. RTTY, on the other hand, is a special data mode — the original!

Read It Now!
The Ultimate Guide To DIY Animatronics
Build Your Own ECG-EKG Unit

BUILD YOUR OWN ECG-EKG UNIT
I built an ECG-EKG unit that plugs into my laptop computer’s microphone input jack.

I find medical instruments like an ECG-EKG unit really fascinating. To be able to watch the electronic firing signals of a heart is mesmerizing and informative. For parts costing less than $50, I built a unit that plugs into my laptop computer’s microphone input jack and displays stunningly clear ECG waveforms. The unit worked beautifully when I tested it on myself, my wife, and friends.

Build It Now!
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Surface-Mount Soldering

HOW TO: SURFACE-MOUNT SOLDERING
Get over your fear of working with these tiny components.

Some people tend to shy away from using surface-mount components in their projects. It seems to be too difficult or needs an array of specialized equipment. In the past, I found myself in this same mindset — wary of using these types of parts. That all changed.

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Routakit
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Altura MIDI Theremin
Continuity Tester Kit
RetroGame
The Mentor’s Friend
Nuts & Volts On CD-ROM
3D LED Matrix Cube
TEENSY Graphics Interface
Arduino Graphics Interface
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Amateur Radio Weekly Newsletter – Week of February 8, 2020


Amateur Radio Weekly Newsletter

Ham radio news, commentary, giveaways, and more!
Celebrating 24 years of service – 1995-2019
Over 7,000 subscribers!
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Saturday, February 8, 2020

  • Plant the Seed! Sow the Future
    There is much rhetoric in amateur radio about getting more people into the hobby. Especially young people. The ARRL has a Teachers Institute which reflects the conventional “train-the-trainer” model of getting K-12 school teachers (mostly) into ham radio in order to expose their students to the fun and learning. The challenge of this is that […]
  • ICQ Podcast Episode 317 – NanoVNA are they any Good?
    In this episode, Martin M1MRB is joined by Leslie Butterfield G0CIB, Edmund Spicer M0MNG, Dan Romanchik KB6NU and Ruth Willet KM4LAO to discuss the latest Amateur / Ham Radio news. Colin M6BOY rounds up the news in brief and this episode’s feature is -…
  • Bring it on!
    Using Dual watch There have been some blog posting regarding the ARRL State QSO party challenge. After looking over the ARRL site regarding this "challenge" it is something that can fit right into my schedule. My wife Julie works most Saturdays an…
  • Weekly Propagation Summary – 2020 Feb 03 16:10 UTC
    Here is this week’s space weather and geophysical report, issued 2020 Feb 03 0217 UTC. Highlights of Solar and Geomagnetic Activity 27 January – 02 February 2020 Solar activity was very low. Region 2757 (N05, L=089, class/area Cso/100 on 27 Jan) decayed to played before rotating around the W. limb. No Earth-directed CMEs were observed […]
  • ‘Barn Door’ CLE
    The next CLE, coming up at the end of the month, will be another ‘barn-door’ event where listeners are encouraged to use wider bandwidths than normal … typically something that will allow you to hear beacons at least 2kHz each side of the frequency…
  • LHS Episode #323: Sloppy Seconds
    Welcome to the 323rd installment of Linux in the Ham Shack. In this episode, the hosts discuss amateur radio and the fires in Australia, state QSO parties, Brexit and CEPT, new extra pool questions, CERN, Facebook, Jericho, UNICEF and much, much more. Thank you for downloading and listening. We hope you have a fantastic […]

  • Icom IC-705
    Ray Novak, N9JA came for a visit with a great new QRP Radio that’s soon to be released.
  • Taking steps forward.
    My last post of December had to do with some goals I wanted to get working on in 2020. It’s now 2020 and as has happened to me in the past I soon will be looking back on 2020 seeing my goals worked or did not work out. One of my goals was to improve my…

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Wireless Modes, Small Logic Gates Part 2, Low Cost Oscilloscope, Creality Ender Review

Newsletter #159

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Nuts & Volts - Everythinmg For Electronics
Wireless Modes - Part 1

WIRELESS MODES – PART 1
If you employ a wireless data or voice link, you’re using modes. This article is an overview of fundamental modes used in communication systems.

As you tune around the ham bands with a radio or spectrum analyzer, you can hear and see a lot of different signal types. These different signals are called “modes” by hams — each with its own purpose, strengths, and weaknesses. This article is the first of a two-part series. Up first is an overview of fundamental modes used in communication systems. Next time, we’ll cover more advanced modes used for data transmission.

Read It Now!
This Changed Everything –
Complete Solutions for One Price
Rohde & Schwarz
Save up to $18,000 on full-solution instruments from Rohde & Schwarz, including oscilloscopes, spectrum analyzers, and power supplies. These instruments come fully loaded with all the bandwidth, channels, memory, spectrum measurements, and signal generation you’ll ever need. Take advantage of this industry first, now through June 30.

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Small Logic Gates - Part 2

SMALL LOGIC GATES — THE BUILDING BLOCKS OF DIGITAL CIRCUITS – PART 2

Discover how binary adders and shift registers can turn simple logic gates into cool calculators.

Now that you have a handle on binary logic and how to make simple gate substitutions to solve your custom IC or obsolete part replacement problems, the next step is to put these gates to work for you. You know, the mundane tasks of add, subtract, multiply, and divide.

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The Ultimate Guide To DIY Animatronics
Low Cost PC Two-Channel Oscilloscope

LOW COST PC TWO-CHANNEL OSCILLOSCOPE
Build an easily portable and cost-effective two-channel oscilloscope that hooks up to a PC.

When having intermittent issues with a garage door not working properly, I thought about dragging my bulky Heathkit oscilloscope out to the garage to hook it up to evaluate what was happening. Fortunately, I came up with a better diagnostic tool that’s more easily portable and cost-effective: a two-channel o-scope that hooks up to a PC.

Build It Now!
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Creality Ender 5 Pro - A Review

CREALITY ENDER 5 PRO — A REVIEW
The Creality Ender 5 Pro is a great 3D printer and one I can highly recommend.

Living in Michigan in the summer and Florida in the winter made transporting my one 3D printer between the two places inconvenient. I decided to experiment with a much cheaper 3D printer, so I could have one at both my homes. Here’s what I found.

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Routakit
Do You Love Robots? - Subscribe To SERVO
Altura MIDI Theremin
Continuity Tester Kit
RetroGame
The Mentor’s Friend
Nuts & Volts On CD-ROM
3D LED Matrix Cube
TEENSY Graphics Interface
Arduino Graphics Interface
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Small Logic Gates, Restoring the First Transistor Radio, Build the RetroGame, Use a Transistor as a Switch

Newsletter #158

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Dr Duino
Small Logic Gates - Part 1

SMALL LOGIC GATES – THE BUILDING BLOCKS OF VERSATILE DIGITAL CIRCUITS – PART 1
Understanding the basic building blocks of logic circuits can get you out of a parts jam, whether it be for a new project or as a replacement device.

All logic circuits are based on two elementary propositions: AND and OR. Throw in an inverter gate (NOT), and you can solve any logic equation. Use these basic building blocks to get you out of a parts jam, whether it be for a new project or as a replacement device.

Read It Now!
This Changed Everything –
Complete Solutions for One Price
Rohde & Schwarz
Save up to $18,000 on full-solution instruments from Rohde & Schwarz, including oscilloscopes, spectrum analyzers, and power supplies. These instruments come fully loaded with all the bandwidth, channels, memory, spectrum measurements, and signal generation you’ll ever need. Take advantage of this industry first, now through June 30.

View Solutions & Pricing

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Restoring the World's First Transistor Radio

RESTORING THE WORLD’S FIRST TRANSISTOR RADIO

Bringing a vintage Regency TR-1 transistor pocket radio back to life.

When Texas Instruments developed a process to mass produce transistors in the early 1950s, they wanted to show the advantages over tubes and decided a transistor pocket radio would be just the ticket. When I finally got my hands on one of these unique units, I wanted to bring it back to its original working condition.

Read It Now!
The Ultimate Guide To DIY Animatronics
Build the RetroGame

BUILD THE RETROGAME
Build it, play it, and re-master your skills at Retro Rover and Tetris.

So, my wife volunteered me for “Science Day” at my son’s elementary school — an annual half day program where moms and dads taught mini-courses on everything from rocketry to zoology to chemistry. But what could I teach the kids? No sooner did the thought cross my mind, did I get the answer: build a video game!

Build It Now!
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How to Use a Transistor as a Switch

HOW TO USE A TRANSISTOR AS A SWITCH
The NPN transistor switch can easily solve many design problems.

Whether you need to flash an LED, energize a relay, turn a buzzer or alarm on or off, or invert a voltage level, the NPN transistor switch can easily solve your problem. This article shows you how to use a transistor as a simple SPST switch.

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Routakit
Do You Love Robots? - Subscribe To SERVO
Altura MIDI Theremin
Macchiato Mini-Synth
RetroGame
The Mentor’s Friend
Nuts & Volts On CD-ROM
3D LED Matrix Cube
TEENSY Graphics Interface
Arduino Graphics Interface
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Amateur Radio Weekly Newsletter – Week of February 1, 2020


Amateur Radio Weekly Newsletter

Ham radio news, commentary, giveaways, and more!
Celebrating 24 years of service – 1995-2019
Over 7,000 subscribers!
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Saturday, February 1, 2020

  • Weekly Propagation Summary – 2020 Jan 27 16:10 UTC
    Here is this week’s space weather and geophysical report, issued 2020 Jan 27 0041 UTC. Highlights of Solar and Geomagnetic Activity 20 – 26 January 2020 Solar activity was very low. Region 2757 (N04, L=089, class/area Cao/060 on 26 Jan) produced a single low level B-class flare on 25/0714 UTC. No Earth-directed CMEs were observed. […]
  • LHS Episode #322: YOTA Deep Dive
    Welcome to the 322nd installment of Linux in the Ham Shack. In this episode, the hosts and special guest Neil Rapp, WB9VPG, of Ham Talk Live discuss the very future of amateur radio in the form of YOTA (Youth on the Air). A program started in IARU Region 1 as Youngsters on the Air, […]

  • If you don’t like the weather in NJ
    just wait five minutes, as the "borrowed" old saying goes! I guess that holds for long range forecasts, too.I’ve been keeping an eye on the long range weather forecast via WeatherUnderground for this coming Saturday – FYBO day.A couple of days ago, the…
  • A nice surprise on 60m FT8
    I was on 60m operating FT8 just after finishing dinner and to my surprise a fellow blogger John AE5X was calling me on the waterfall. A very nice surprise for sure I have read his blog for some time and it was great to make contact with him on the rig….
  • For those of you out there
    who have a real yen for Amateur Radio contesting and Radiosport competition in general ……….. I ran across this announcement on the ARRL Webpage the other day.The State QSO Party Challenge is a competition comprised of other contests, namely state…

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Amateur Radio Weekly Newsletter – Week of January 25, 2020


Amateur Radio Weekly Newsletter

Ham radio news, commentary, giveaways, and more!
Celebrating 24 years of service – 1995-2019
Over 7,000 subscribers!
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Saturday, January 25, 2020

  • ICQ Podcast Episode 316 – Questions Answered and Tips
    In this episode, Martin M1MRB is joined by Chris Howard M0TCH, Martin Rothwell M0SGL, Frank Howell K4FMH, Ed Durrant DD5LP and Bill Barnes N3JIX to discuss the latest Amateur / Ham Radio news. Colin M6BOY rounds up the news in brief and this episode’s …
  • Weekly Propagation Summary – 2020 Jan 20 16:10 UTC
    Here is this week’s space weather and geophysical report, issued 2020 Jan 20 0748 UTC. Highlights of Solar and Geomagnetic Activity 13 – 19 January 2020 Solar activity was very low. The solar disk was spotless. No Earth-directed CMEs were observed. No proton events were observed at geosynchronous orbit. The greater than 2 MeV electron […]
  • Hunting For NDBs In CLE252
    AP-378 Mayne Island, BCHow time flies. Once again it’s a CLE weekend. It seems like the last one was just a week ago! ‘CLE’s are ‘Co-ordinated Listening Events, and NDB DXers around the world focus their listening time on one small slice of the NDB …
  • Bumfuzzled
    bumfuzzle[ buhm-fuhz-uh l ] verb (used with object), bum·fuz·zled, bum·fuz·zling. Chiefly South Midland and Southern U.S. – to confuse or fluster. Origin of Bumfuzzle 1900–05; bum- (expressive prefix, perhaps to be identified with the initial syllable of bamboozle) + fuzzle to confuse (perhaps expressive alteration of fuddle) This is how I would characterize my reaction to this item appearing on the ARRL […]

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editor

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Magic of the Gilbert Erector Set, Thermal Management, Power Supply, Replacing the 555 with a PIC Part 4

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Dr Duino
The Magic of the Gilbert Erector Set

THE MAGIC OF THE GILBERT ERECTOR SET
Update a classic Erector Set Ferris Wheel with an Arduino.

Erector sets helped to spark lifetime passions for building things. Take a trip down memory lane and follow the construction of a classic 1950’s Gilbert Erector set Ferris wheel with some new bells and whistles added from today’s technology.

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Coming Soon from Pico Technology!
The Next-Generation Scope
Pico Technology Next-Gen Scope
Offering more inputs with8 analog + 16 digital channels (MSO), deeper 4 GS memory buffer, higher bandwidth of 500 MHz and smarter 8/10/12-bit FlexRes® architecture plus 21 serial protocol decoders all included standard, our new scope is something our competitors don’t want you to see. Want the details?

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Thermal Management

THERMAL MANAGEMENT

Some hot topics for a cool hobby.

While not strictly a ham radio topic, hams certainly have to deal with managing a surplus of heat. From an extra-hot quarter watt to getting hundreds of watts away from the business end of a linear amplifier running a “full gallon,” hot spots need attention! Let’s see about giving a few important ideas the third degree, including an easy experiment you can do on the bench.

Manage It Now!
The Ultimate Guide To DIY Animatronics
Lab Power Supply

HIGH VOLTAGE OP-AMPS, A CURRENT SENSOR, AND A 32-BIT MICROCONTROLLER: HOW ABOUT A LAB POWER SUPPLY?
This article will show you all the steps needed to design a programmable supply.

In most linear power supplies, voltage and current limits are entered with rotating knobs. For faster and higher precision, I wanted to design a lab power supply for my bench with voltage and current limits entered via a keypad. I included a microcontroller to take care of the keypad input functions but wanted the basic supply to be linear – no switching and less noise! Here’s how I did it.

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ME Labs
Replacing The 555 With A PIC — Part 5

REPLACING THE 555 WITH A PIC — A DIGITAL ANALOG — PART 5
This is the final installment that looks at the remaining circuits from the book, 555 Timer IC Circuits by Forrest Mims.

This final article in our series will examine those circuits from the “555 Timer IC Circuits” by Forrest Mims which were not covered in any of the preceding four articles.

Read It Now!
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Routakit
Do You Love Robots? - Subscribe To SERVO
Altura MIDI Theremin
Macchiato Mini-Synth
RetroGame
The Mentor’s Friend
Nuts & Volts On CD-ROM
3D LED Matrix Cube
TEENSY Graphics Interface
Arduino Graphics Interface
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Amateur Radio Weekly Newsletter – Week of January 18, 2020


Amateur Radio Weekly Newsletter

Ham radio news, commentary, giveaways, and more!
Celebrating 24 years of service – 1995-2019
Over 7,000 subscribers!
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Saturday, January 18, 2020

  • Weekly Propagation Summary – 2020 Jan 13 16:10 UTC
    Here is this week’s space weather and geophysical report, issued 2020 Jan 13 0408 UTC. Highlights of Solar and Geomagnetic Activity 06 – 12 January 2020 Solar activity was very low. Region 2755 (S34, L=355, class/area Bxo/020 on 03 Jan) decayed to plage on 07 January and was absent of significant flare activity during the […]
  • Solder Smoke Host to Kick-Off Banner Year of CMSARA Speakers
    January 11, 2020. (Brandon, MS): For Immediate Release Information Contact: Frank Howell K4FMH k4fmh A fan favorite from the internationally known video podcast, Ham Nation, kicks off the 2020 programs for the Central Mississippi Amateur Radio Club. “We are delighted to have George Thomas W5JDX, star of the Solder Smoke segment on Ham Nation and […]
  • LHS Episode #320: The Fire Down Below
    Welcome to the 320th installment of Linux in the Ham Shack. In this episode, the hosts cover amateur radio and the recent earthquake in Puerto Rico and fires in Australia, Bitcoin, ARRL awards, Huawei, TensorFlow, Tucnak, Gridtracker and a whole lot more. Thank you for listening to our program and we hope you have […]

  • Upgrading to Windows 10…..for a short time anyway.
    Last week I decided it was time to update my computer OS from Windows 7 pro to Windows 10 pro. Because I have a registered version of Windows 7 the Windows 10 is a free upgrade and with this upgrade, I am able to keep all my programs on the computer th…
  • George W5JDX Sets Rig on Fire!
    Channeling his inner Jerry Lee Lewis, George Thomas W5JDX set his dual-band rig on fire at the Central Mississippi Amateur Radio Association on Tuesday evening. All for demonstrating DIY Projects with Arduino and Raspberry Pi. Not everyone is aware that W5JDX is an accomplished musician. George brought the house down, to say the least, with […]
  • LHS Episode #321: The Weekender XL
    It’s time once again for The Weekender. This is our bi-weekly departure into the world of amateur radio contests, open source conventions, special events, listener challenges, hedonism and just plain fun. Thanks for listening and, if you happen to get a chance, feel free to call us or e-mail and send us some feedback. […]

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Do you like to write? Please consider submitting an article.

Matt W1MST
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editor

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Dark Energy and the Expanding Universe, Rotators, USB Cable Test Jig, Replacing the 555 with a PIC Part 4

Newsletter #156

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Dr Duino
Dark Energy and the Expanding Universe

DARK ENERGY AND THE EXPANDING UNIVERSE
Explore concepts such as energy density and negative pressure as it relates to our universe.

Time for a little weird science! Concepts such as energy density and negative pressure as they relate to our expanding universe are difficult for most of us to understand since we don’t see them in our daily lives. In this article, we’ll explore these ideas and analyze an electrical model with similar properties that is constructed with some copper plates and an electrometer. Comparing this model to the cosmological model of our universe should help us understand these concepts and emerging theories of the cosmos. Hopefully, in the process, we’ll learn more about how our fantastic universe works.

Read It Now!
This Changed Everything –
Complete Solutions for One Price
Rohde & Schwarz
Save up to $18,000 on full-solution instruments from Rohde & Schwarz, including oscilloscopes, spectrum analyzers, and power supplies. These instruments come fully loaded with all the bandwidth, channels, memory, spectrum measurements, and signal generation you’ll ever need. Take advantage of this industry first, now through June 30.

View Solutions & Pricing

Advertisement

Rotators

ROTATORS

The rotator is worth installing carefully and being treated with care. After all, your ham radio success turns on them!

If the antennas that hams use can focus a signal, then they need to be able to focus it in the desired direction. The thing that hams use to point their antennas — large and small — is called a rotator. There is a wide range of rotators, just like with antennas. We’ll cover some of the most common types and give you an idea of how they work.

Rotate It Now!
The Ultimate Guide To DIY Animatronics
Build A USB Cable Continuity Test Jig

BUILD A USB CABLE CONTINUITY TEST JIG
Build a simple test jig that will make it easier for you to quickly check the continuity of a four-conductor USB cable.

If you’re like me, you likely have a drawer or shoe box stuffed with assorted USB cables that are used to either charge or program a USB device. The problem often is that some cables may only be useful for charging, and which only have the +Vcc and ground wires intact with one or both data wires either broken or not connected in the first place. Here’s a simple test jig to help you tell what’s what.

Build It Now!
ME Labs
Replacing The 555 With A PIC — Part 4

REPLACING THE 555 WITH A PIC — A DIGITAL ANALOG — PART 4
This fourth article discusses the more complex circuits from the book, 555 Timer IC Circuits by Forrest Mims.

This installment will examine the more complex circuits from the book, “555 Timer IC Circuits” by Forrest Mims. Some will use the PIC replacement from Part 1, while others will develop specific programs using a PIC to emulate a particular implementation of a 555.

Read It Now!
Subscribe To Nuts & Volts
Routakit
Do You Love Robots? - Subscribe To SERVO
Altura MIDI Theremin
Macchiato Mini-Synth
RetroGame
The Mentor’s Friend
Nuts & Volts On CD-ROM
3D LED Matrix Cube
TEENSY Graphics Interface
Arduino Graphics Interface
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Nuts & Volts Magazine | 2279 Eagle Glen Pkwy #112-481, Corona, CA 92883
951.371.8497 | editor | www.nutsvolts.com
T & L Publications, Inc, 2279 Eagle Glen Pkwy #112-481, Corona, CA 92883, United States, 951 371-8497

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