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Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024
Webmaster:
    Kirt Blattenberger,

    BSEE - KB3UON

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 arrived...

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Homepage Archive - February 2021 (page 1)

These archive pages are provided in order to make it easier for you to find items that you remember seeing on the RF Cafe homepage. Of course probably the easiest way to find anything on the website is to use the "Search RF Cafe" box at the top of every page. About RF Cafe.

Homepage Archive Pages

2021:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2020:
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2019:
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2018:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2017:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
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2014:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2013:  Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec
2012:  1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13


See Page 1 | 2 | 3 | 4 | 5 of the February 2021 homepage archives.
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Friday the 5th

Engineering and Physics Theme Crossword Puzzle for February 7th

Engineering and Physics Theme Crossword Puzzle for February 7th, 2021 - RF CafeThis Engineering and Physics Theme crossword puzzle for February 7th contains only words and clues related to engineering, mathematics, chemistry, physics, and other technical words. 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., Hedy Lamarr or the Bikini Atoll). The technically inclined cruciverbalists amongst us will appreciate the effort. Enjoy!

Radio Electronics Monthly Review August 1945

Radio Electronics Monthly Review, August 1945 Radio & Television News - RF CafeAlthough not specifically stated, some of the technology reported in this August 1945 issue of Radio-Craft magazine was not so long before classified technology developed during World War II. The Radiotype system of wireless teletype developed by General Electric was an early attempt to provide a mobile means of sending and receiving hard copy messages. It was a rather complex scheme that used a typewriter to drive a tape punching apparatus, which was fed into a radio transmitter to send coded tones (as opposed to CW pulses) for a receiver to then decipher and drive an Electromatic typewriter. The demonstration used a police car to carry remote equipment. In related news, RCA's wireless 488 word-per-minute (wpm) telegraph multiplexer using time division multiplexing (TDM) Also featured was the FCC's decision to move the commercial broadcast FM band from 54-88 MHz up to 88-106 MHz (now up to 108 MHz...

Please Visit Windfreak in Appreciation of Their Support!

Windfreak TechnologiesWindfreak Technologies designs, manufactures, tests and sells high value USB powered and controlled radio frequency products such as RF signal generators, RF synthesizers, RF power detectors, mixers, up / downconverters. Since the conception of WFT, we have introduced products that have been purchased by a wide range of customers, from hobbyists to education facilities to government agencies. Worldwide customers include Europe, Australia, and Asia. Please contact Windfreak today to learn how they might help you with your current project.

CHESS Constellation to Carry FUNcube Transponders

CHESS CubeSat Constellation to Carry FUNcube Transponders - RF Cafe"In 2020, a project between AMSAT-UK, AMSAT-NL, and Swiss universities got under way with the aim of equipping two Swiss satellites - for now under the CHESS name - with linear amateur radio transponders. Linear transponders permit several CW or SSB contacts to take place simultaneously within a prescribed passband. The satellites also include features for classroom demonstrations and experiments. The CHESS (Constellation of High Energy Swiss Satellites) project includes two satellites, which will be built simultaneously and later launched as a constellation. 'The main science objective is to improve the understanding of the upper atmosphere by in-situ measurements..."

Post Your Engineer & Technician Job Openings on RF Cafe for Free

Engineering Job Board - RF CafeRF Cafe's raison d'être is and always has been to provide useful, quality content for engineers, technicians, engineering managers, students, and hobbyists. Part of that mission is offering to post applicable job openings. HR department employees and/or managers of hiring companies are welcome to submit opportunities for posting at no charge. 3rd party recruiters and temp agencies are not included so as to assure a high quality of listings. Please read through the easy procedure to benefit from RF Cafe's high quality visitors...

British Radio Hoax Traps "Pirate" Listeners

British Radio Hoax Traps "Pirate" Listeners, April 1932 Radio News - RF CafeWhen you think of "pirate radio," most likely what comes to mind is a rogue, unlicensed transmitter that is re-broadcasting copyrighted material, syndicated shows, etc., on radio or television. Nowadays that would also include the Internet as a medium. Did you know that, at least decades ago, the British government (and maybe others) charged citizens a fee for listening to broadcasts on their household radios? That's right, if you wanted to listen to the BBC, you would kindly remit a fee of 10 shillings ($2.50 in U.S. dollars at the time) per year. Otherwise, you were apt to have government inspectors descend upon you and padlock your radio set - or collect the requisite 10 shillings on the spot. After a growing number of suspected dishonest British subjects finally exceeded the reasonable level of tolerance of the government, a clever scheme was devised to trick evil citizens into divulging their nefarious crimes. Author Austen Fox does a great job of telling the tale. The stunt would make a good candid camera ploy for a good laugh today, but in the 1930s when radio waves were mysterious and even feared...

Anatech Electronics February 2021 Product Update

Anatech Electronics February 2021 Product Update - RF CafeAnatech Electronics offers the industry's largest portfolio of high-performance standard and customized RF and microwave filters and filter-related products for military, commercial, aerospace and defense, and industrial applications up to 40 GHz. The AB829B1038 is an 829 MHz High Performance LTE Band Cavity Band Pass Filter. It features a very sharp transition between the passband and the rejection frequencies, an attenuation of 40 dB minimum 1.5 MHz away from the band edges. The AE2075-5125DB5458 is a 1650-2500 MHz/4400-5950 MHz Duplexer. Isolation between the bands is greater than 70 dB. Custom RF power directional coupler designs can be designed and produced when a standard cannot be found...

Many Thanks to Berkeley Nucleonics for Continued Support!

Berkeley Nucleonics Corp - RF CafeBerkeley Nucleonics Corporation (BNC) is a leading manufacturer of precision electronic instrumentation for test, measurement, and nuclear research. Founded in 1963, BNC initially developed custom pulse generators. We became known for meeting the most stringent requirements for high precision and stability, and for producing instruments of unsurpassed reliability and performance. We continue to maintain a leadership position as a developer of custom pulse, signal, light, and function generators. Our designs incorporate the latest innovations in software and hardware engineering, surface mount production, and automated testing procedures.

Thursday the 4th

Realistic TRC-409 Portable Citizens Band Radio

Realistic TRC-409 Portable Citizens Band Radio (Radio Shack) - RF CafeIt has been a long time since I've had a citizens band (CB) radio in my car. Back in the 1970s when the CB craze was at its peak, with songs like C.W. McCall's "Convoy"* topping Casey Kasem's American Top 40 (AT40) charts, my high school compadres were all installing 23-channel CBs (standard at the time) in their cars and pickups. I joined in with a Radio Shack unit (don't recall the model number). In those days the FCC required operators to register and mail a check for a few bucks - same with radio control (R/C) systems for model airplanes also operating in the same 26-27 MHz radio band - in return for a "Citizens Radio Station License" document to carry in your wallet. Most CB channels were spaced at 10 kHz, but the R/C frequencies were in−between some CB channels spaced at 20 kHz. For instance, my 3-channel OS Digitron R/C system was at 27.195 MHz, which resided between CB channels 19 (27.185 MHz) and 20 (27.205 MHz). Some electronically savvy CBers would illegally modify their radios to include operation on those in−between frequencies (e.g. Ch 19A at 27.195 MHz), thereby creating a scenario where merely keying up the transmitter could "shoot down" a model airplane if close enough...

Thanks Again for Windfreak Technologies' Continued Support!

Windfreak TechnologiesWindfreak Technologies designs, manufactures, tests and sells high value USB powered and controlled radio frequency products such as RF signal generators, RF synthesizers, RF power detectors, mixers, up / downconverters. Since the conception of WFT, we have introduced products that have been purchased by a wide range of customers, from hobbyists to education facilities to government agencies. Worldwide customers include Europe, Australia, and Asia. Please contact Windfreak today to learn how they might help you with your current project.

EM Spectrum Could Be Cheaper Option to Defeat Enemies

Electromagnetic Spectrum Could Be Cheaper Option to Defeat Enemies - RF Cafe"The Air Force is looking into flipping the cost curve when it comes to defeating adversaries by focusing on electronic or nonkinetic capabilities as opposed to missiles. 'In some aspects, an electron is much cheaper than a very expensive missile,' Gen. Charles Brown, chief of staff of the Air Force, said during a January 27 web event hosted by the Association of Old Crows. 'We've got to think about the cost curve' and be able to do both the kinetic and nonkinetic. Brown acknowledged that the Air Force has been 'asleep at the wheel' for the last 25 to 30 years when it comes to operations in the electromagnetic spectrum. Sophisticated adversaries have noted the spectrum is critical for U.S. forces and have sought high-tech methods to deny it..."

ConductRF Ready Made "Plug-In" RF Cables for D38999 and VITA67

ConductRF Ready Made "Plug-In" RF Cables for D38999 and VITA67 - RF CafeWe know, many times you want to just buy your RF assemblies to plug in to your Circular D38999 Connector or your VITA67 module. Well know ConductRF offers multiple solutions for both styles of Multi-Port connector all available on short lead times based on our on hand materials stock. D38999 integrates BMA, SMPM & SMPS Connectors, also other #8, #12 & #16 Coax Contact solutions. VITA67.1/2 uses SMPM solutions, but the new VITA67.3 also offers SMPS and NanoRF to support your coax requirements. These are 100% factory tested to exacting VSWR and Loss standards because, We know, Results Count!

Hams in Combat

Hams in Combat, April 1945 QST - RF CafeWhile recently watching the classic film "The Longest Day," about the June 6, 1944 D-Day invasion, I paid particular attention to the electronics being featured. During World War II, means of communications were nowhere near as ubiquitous as they are today with cellphones, the Internet, and readily affordable, high quality portable Ham gear. Large, heavy radio, teletype, and radar gear made portable by equally large and heavy batteries, often significantly hampered progress under fire. As illustrated in the movie, relying on easily cut or blown up landlines caused significant loss of strategic capability. Thousands of experienced Amateur Radio operators provided the Allied forces with out-of-the-gate communicators and electronics technicians. Many had, prior to enlisting, donated some of their equipment and components to the Department of War for use, ultimately, in securing victory...

Intro to LabVIEW FPGA for RF, Radar, and EW Apps

Introduction to LabVIEW FPGA for RF, Radar, and Electronic Warfare Applications (Artech House) - RF CafeArtech House today announced the publication Introduction to LabVIEW FPGA for RF, Radar, and Electronic Warfare Applications by Terry Stratoudakis. Real-time testing and simulation of open- and closed-loop radio frequency (RF) systems for signal generation, signal analysis and digital signal processing require deterministic, low-latency, high-throughput capabilities afforded by user reconfigurable field programmable gate arrays (FPGAs). This comprehensive book introduces LabVIEW FPGA, provides best practices for multi-FPGA solutions, and guidance for developing high-throughput, low-latency FPGA based RF systems. It provides real-time testing and simulation of open- and closed-loop RF systems for signal generation, signal analysis, and digital signal processing that require deterministic, low-latency, high-throughput capabilities presented by user reconfigurable FPGAs. Written by a recognized expert with a wealth of real-world experience in the field...

Please Visit NorthEast RF's Website in Appreciation of Their Support

NorthEast RF - RF CafeNorthEast RF's comprehensive antenna testing services include linear | circular polarized antenna measurements and OTA cellular device pre-compliance. Up to 18" diameter and <10 kg weight. Antennas can be rapidly evaluated and optimized using our fast near field spherical system. Test results supplied in data file with pattern viewer software. A picture of the test configuration is included to help aligned axis. Our selection of human head and hand phantoms are ideal for verification of body worn devices. Turnaround time is usually 3-days.

Wednesday the 3rd

Mac's Radio Service Shop: Customer Cussedness

Mac's Radio Service Shop: Customer Cussedness, July 1951 Radio & Television News - RF CafeMany times, especially after reading an episode of "Mac's Radio Service Shop," I start thinking of how I would have liked to have owned an electronics shop back in the golden age of radio and, to a lesser extent, television. A person would have to be really sharp with circuits and test equipment to be successful because every component of every part of the assembly was discrete - no integrated circuits. You needed to be able to troubleshoot and repair the power supply, RF, IF, and baseband sections, video, audio, and demodulation - everything. You also needed to be smart enough to keep yourself from getting killed by the high voltages floating around in the chasses. What makes me think twice about wanting the business is the subject of this installment, "Customer Cussedness." Dealing with idiots would be harder to take than the worst head-scratcher electronics problem. While at Westinghouse Oceanic Division in Annapolis, Maryland, I had the privilege of knowing a fine fellow named Wilson Roe...

Loose Parts Comic

Loose Parts comic 2-11-2020 - RF CafeThe Far Side, by Gary Larson has always been my favorite weird-wit comic strip that often took shots at scientists and mathematicians, and many have tried to replace it after it ended in on January 1, 1995. "Loose Parts," drawn by Dave Blazek, comes the closest IMHO. This one from February 11, 2020 is a great example of the kind of material he comes up with. You can scroll through other panels from the link.

3D Directory Listing Added to Vendor Pages

3D Directory Listing Added to Vendor Pages - RF Cafe3D.directory is the largest directory of 3D Printing companies on Internet. We have listed 3D Printing, 3D Scanning and 3D Design companies from around the world and made them searchable by their location and capabilities. RF Cafe page: 3D Printers and Fabrication

If you would like your company listed, please look through the RF Cafe Vendor Pages topic list and send me an e-mail with company name and contact information (city, phone, URL), and a brief description (see pages for examples).

Army Fast-Tracks Adaptable Radars for Congested Environments

Army Fast-Tracks Adaptable Radars for Congested Environments - RF Cafe"A new machine learning approach could improve radar performance in congested environments. Researchers from the U.S. Army Combat Capabilities Development Command, now known as DEVCOM, Army Research Laboratory and Virginia Tech developed an automatic way for radars to seamlessly operate in congested and limited spectrum environments created by commercial 4G LTE and future 5G communications systems. 'Future implementations of this algorithm into Army legacy and developmental radars will provide unprecedented spectrum dominance for soldiers,' said Army researcher Dr. Anthony Martone. 'This will enable soldiers to use their radars for problems such as tracking incoming targets..."

BNC Webinar: Are You Ready for Quantum Computing?

BNC Webinar: Are You Ready for Quantum Computing? (Free Admission) - RF CafeBerkeley Nucleonics Corporation (BNC - like the connector) will be conducting a free webinar on Thursday, February 25th, entitled "Quantum Computing." To most people, including me, quantum computing is still a mysterious technology. Its concepts of multiple simultaneous logic states makes the fuzzy logic craze of the 1980s look sharply focused. Photos of quantum computers built by IBM*, Microsoft, and Google look like science fiction chandeliers where you expect to see the rejuvenated brains of Albert Einstein, Galileo Galilei, or Isaac Newton soaking in a bubbling bath of formaldehyde with wires sticking out of them. A short paper entitled, "Are You Ready for Quantum Computing" can be accessed on the BNC website. Berkeley Nucleonics produces a number of instrumentation items used by quantum computing researchers...

Aluminum Wire Gaining Popularity

Aluminum Wire Gaining Popularity, March 1948 Radio Craft - RF CafeAluminum wire's role in electronics and electrical service systems is an interesting case study. Early on, as this 1948 Radio-Craft magazine article reports, aluminum was seen as a panacea for harder to find copper sources and attendant price increases. Back in the early 1970s when I first began working as an electrician while taking vocational courses in high school, aluminum wire was being installed in low-end tract homes, apartments, and townhouses in order to save a little money. Usually, you needed to go one size up (12 ga. for 15 A circuits instead of 14 ga.), but the cost was still less. The National Electric Code (NEC) permitted it at the time because it had not been in service long enough for its cold flow nature to manifest itself through loosening connection interfaces and eventual fires due to sparking under load. Brittleness after repeated stressing also caused arcing and resulted in fires, as did corrosion brought on by dissimilar metals...

Russia EMP Threat

Russia EMP Threat - RF CafeA new report was recently released by the EMP Task Force on National and Homeland Security entitled, "Russia: EMP Threat -  The Russian Federation's Military Doctrine, Plans, and Capabilities for Electromagnetic Pulse (EMP) Attack." Despite the official-looking organization name it is a private research group, but often outside-Washington research informs on world events more completely with unfiltered data. We know EMP events are capable of instantly crippling vital infrastructure by inducing damaging currents and voltages in and onto, respectively, power supply lines (and consequently the devices connected to them), as well as disconnected devices (battery-powered items). This is not tinfoil hat conspiracy theory like mind control via cell tower radiation and chemicals in the drinking water. Lots of effort goes into war-gaming EMP scenarios by DHS, DoD, DoE, et al. Having a vacuum tube radio and a vintage computer-free truck won't help you for long with no electricity to charge batteries or to run gas pumps.

Many Thanks to Exodus Advanced Communications for Their Support

Exodus Advanced Communications - RF CafeExodus Advanced Communications is a multinational RF communication equipment and engineering service company serving both commercial and government entities and their affiliates worldwide. Power amplifiers ranging from 10 kHz to 51 GHz with various output power levels and noise figure ranges, we fully support custom designs and manufacturing requirements for both small and large volume levels. decades of combined experience in the RF field for numerous applications including military jamming, communications, radar, EMI/EMC and various commercial projects with all designing and manufacturing of our HPA, MPA, and LNA products in-house.

Tuesday the 2nd

Power Supply Design

Power Supply Design, August 1945, Radio-Craft - RF CafeGood power supply design has always been key to good system function. As with so many other topics in electronics, the basics of power supply design are the same now as they were in 1945 when this article appeared in Radio-Craft magazine. We now have transistors rather than vacuum tubes, but otherwise issues of voltage regulation, current supply, ripple, and power dissipation remain. Off-the-shelf power supplies have been and are available where engineers have designed generic or special purpose units with a set of specifications which a system designer uses to integrate them into their products. Many times, though, it is necessary or preferred to have the power supply on the same circuit board or in the same enclosure as the functional part of the product, so it is up to the designer to do it all...

Please Thank Aegis Power Systems for Their Renewed Support!

Aegis Power Systems - RF CafeAegis Power Systems is a leading supplier of AC-DC and DC-DC power supplies for custom and special applications. Aegis has been designing and building highly reliable custom power supplies since 1995. They offer a complete line of switch mode power supplies and power converters for a variety of markets including defense, industrial, aircraft, VME, and telecom. Supports military, aircraft, EV, telecom, and embedded computing applications. Design and manufacture of custom power supply solutions to meet each customer's exacting specifications. Please visit Aegis Power Systems today.

DoD Strategy to Counter-Small Unmanned Aircraft Systems

DoD Strategy to Counter-Small Unmanned Aircraft Systems - RF Cafe"The U.S. Department of Defense (DoD) has released a plan to counter the increased threats posed by the proliferation of small drones commercially and by militaries. In a 36-page strategy released on January 2021, strong emphasis has been placed on inter-agency cooperation in the federal government to develop a baseline of knowledge, solutions, infrastructure, and response to counter small, unmanned aircraft systems (sUAS) threats. Small drones have become increasingly affordable and portable with growing capabilities, such as the ability to swarm and carry out cyberattacks, all of which could be enhanced with the use of artificial intelligence and autonomous systems..."

EMC Directory Listing Added to Vendor Pages

EMC Directory Listing Added to Vendor Pages - RF CafeEMC Directory is the largest directory of EMC / EMI Testing companies on Internet. We have listed the leading EMC / EMI companies from around the world and made them searchable by their location and capabilities - emission testing, immunity testing, CE/FCC marking certification etc. RF Cafe page: EMC / EMI / RFI Manufacturers & Services

If you would like your company listed, please look through the RF Cafe Vendor Pages topic list and send me an e-mail with company name and contact information (city, phone, URL), and a brief description (see pages for examples).

Radio Physics Course: Resistances in Radio

The Radio Physics Course: Resistances in Radio, April 1932 Radio News - RF CafeYou've heard of "Litz" wire, right? It's the twisted bundle of multiple enamel or otherwise coated wire used for making couplers, antennas, and at frequencies up to about a couple MHz. Congratulations, but did you know the full name for it is "Litzendraht?" Neither did I until after reading this article. Litzendraht does not derive from the surname of a fellow named Otto or Wolfgang Litzendraht, but is the German word meaning "braided wire" or "woven wire." Litzen by itself means braided or stranded. So, technically if you call it Litzendraht wire, you are being redundant since it is the same as saying woven wire wire. That might save you some embarrassment one day if you happen to be working around a German techie. Litzendraht is used in order to exploit the skin effect at high frequencies where the majority of the current is conducted on the wire's surface. Using multiple insulated wires enables greater current carrying capability...

EW 105: Space Electronic Warfare

EW 105: Space Electronic WarfareArtech House today announced the publication of EW 105: Space Electronic Warfare by David L. Adamy. The fifth book in the bestselling Artech House EW 100 series explores electronic warfare (EW) in space. Practical problems – including intercept and jamming of hostile signals transmitted from the Earth's surface and the vulnerability of satellite links to attack from the Earth's surface are discussed. Spherical trigonometry is covered to provide the background necessary to understand the scope of satellite problems. Orbit mechanics, specifically the way the Earth and its satellites revolve around one another, is also explained. The basics of radio propagation and how it applies to communications Electronic Warfare are demonstrated, as well as the special considerations that apply to radio transmission to and from an Earth satellite. Satellite links and link vulnerability are discussed. New Release Price: $96

Thanks Again to LadyBug Technologies for Their Continued Support!

LadyBug Technologies RF Power Sensors - RF CafeLadyBug Technologies was founded in 2004 by two microwave engineers with a passion for quality microwave test instrumentation. Our employees offer many years experience in the design and manufacture of the worlds best vector network analyzers, spectrum analyzers, power meters and associated components. The management team has additional experience in optical power testing, military radar and a variety of programming environments including LabVIEW, VEE and other languages often used in programmatic systems. Extensive experience in a broad spectrum of demanding measurement applications. You can be assured that our Power Sensors are designed, built, tested and calibrated without compromise.

Monday the 1st

Photographic History of Radiotelephony

Photographic History of Radiotelephony, December 1939 Radio & TV News - RF CafeHere is an interesting photo montage of many ground-breaking events in the history of radiotelephony, which appeared in a 1939 issue of Radio News magazine. A mere 35 years had passed since Guglielmo Giovanni Maria Marconi sent and received his first wireless signal in the attic of his house. The equipment might seem crude compared to today's technology - and it is - but it is miraculous considering both the electrical and mechanical ingenuity that went into producing it. Engineers, scientists, technicians, manufacturing specialists, and managers from (primarily) the U.S. and Europe combined their collective genius and determination to advance the state of the art at a blinding pace. Many of you have seen some of these pictures before. An identification key to each is provided...

PCBONLINE Blog: PCB Creation with AutoDesk Eagle

PCBONLINE Blog: PCB Creation With AutoDesk Eagle | Step-by-Step Tutorial - RF Cafe"PCBONLINE, a custom advanced circuit board manufacturer, has recently published an AutoDesk Eagle tutorial. The step-by-step guide demonstrates how to create a PCB using the software. First, it explains the program control panel, the schematic window, and the board window. Then the tutorial tells how to create a new project, add parts, add connections between parts, name and label the nets, provide parts with value, check the electrical rules, and route the board. If you're new to PCB design or use AutoDesk Eagle, this comprehensive guide should be beneficial. When you're done with PCB creation, you can have circuit boards made by PCBONLINE, which checks your Gerber and BOM carefully and provides free tech support..."

Engineering Humor for the Ages

Engineering Humor for the Ages - RF CafeI like a good clean joke as much as the next guy, and Design News has a good collection of them in its "Engineering Humor for the Ages" slideshow, but this "Types of People" totally misses the mark. The traditional form states, "There are 10 kinds of people in the world - those who understand binary and those who don't." It appears the writer is the latter type of person. Take a look and see what I mean. The "Engineering Units" section includes some really good ones I have not seen before, but this seems wrong "1000 aches: 1 megahurtz" (should be "1 kilohurtz").  The entire presentation begins here. Here is my favorite. Need more? There are scores of engineering and science humor pages here on RF Cafe.

A Course in Radio Fundamentals - Vacuum Tubes

A Course in Radio Fundamentals - Vacuum Tubes, September 1942 QST - RF CafeIt's hard for most people alive today to imagine a time when vacuum tubes were the only means of amplification and rectification available. The discovery and application of semiconductors as replacements was a huge step forward for all but the highest power applications like megawatt power amplifiers. Equally hard to imagine is having to design circuits without the aide of computers - or at least a digital calculator. Parameter tables and slide rules were de rigueur for the day. Power supplies in the hundreds of volts were commonplace and printed circuit boards were a platform of the future. Point-to-point wiring ruled the day. Other than for special cases like traveling wave tubes (TWTs) and microwave magnetrons, there are not many engineers left that design tubes. As with a lot of the vintage methods and equipment, it is amateur hobbyists who keep the art of tube circuits alive. The Internet is full of projects and articles on tube design...

Exodus Advanced Communications Intros 700-6000 MHz, 100 W SSPA

Exodus Advanced Communications Intros 700-6000 MHz, 100 W SSPA - RF CafeExodus Advanced Communications' broadband AMP2070C Solid State Power Amplifier (SSPA) is designed for broadband EMI-Lab, Communications, and Electronic Warfare (EW) applications. Its Class A/AB linear design accommodates all modulations & industry standards. It covers 700 MHz – 6.0 GHz, produces 100 W Minimum, 50 W P1dB, with a minimum 50 dB Gain. The AMP2070C exhibits excellent gain flatness, optional monitoring parameters for forward / reflected power, voltage, current & temperature sensing for superb reliability and ruggedness. Integrated in our compact 3U chassis weighing <25 kg. Rack-mountable with dimensions of 430 mm x 133 mm x 560 mm...

Many Thanks to MPDevice for Continuing Support!

MPDevice - RF CafeMPDevice (MPD) has become a trustworthy and reliable company in the global RF market as a manufacturer of passive RF devices. Included are attenuators and terminations, coaxial connectors, adapters, and cable assemblies, DC blocks, surge arrestors, power combiner / dividers, and directional couplers. The Korean Telecommunication market is now entering into the era of hyperconnected society. With continuous enhancement in R&D capabilities and quality control, MPD will continue in an effort to become the No. 1 technologically innovative company with a focus on the emerging 5G marketplace.

   
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