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An interesting review of the Icom 2720H VHF UHF amateur radio mobile transceiver with pros and cons

Ascension Ham Radio Club based in Gonzales Louisiana

The branch of electronics dealing with devices that generate, transform, transmit, or sense optical, infrared, or ultraviolet radiation

Stuff about amateur (ham) radio, especially VHF/UHF, QRP, portable and mountaintop operating

New generation Hex Beam Antennas. VHQ HEX Products, located in Peterborough, NH, is owned and operated by David M. Lavoie. Our products are designed to solve issues encountered in Ham radio applications and move with todays configurations in an ever changing climate

Just my little corner of the world, one radio at a time

Voted the best darn Ham Radio club in Texas 7 years in a row.

Eastern and Mountain District Radio Club

Sell generator, and generator parts from generac, guardian, asco, and more

The J Pole antenna is a good omnidirectional antenna that can be used for portable or fixed station usage. It does not need a ground, and neither complex feed systems. It can be homemade with simple material and in several ways.Article in Italian

Papua New Guinea 2011 DX pedition official web site

This is a synopsis of a talk presented to the Sydney VHF DX GROUP by VK2ZAB on how, when and why is convenient to build a Yagi antenna stack.

The AA4F Key Contact Cleaner is designed for maintaining key contacts, ensuring reliable operation in 2-way radio communications. **Regular use** of this cleaner can significantly improve contact performance, reducing the risk of intermittent signals. It is particularly effective for cleaning contacts on various key types, including _straight keys_ and _paddles_. Proper maintenance extends the lifespan of your equipment, ensuring consistent operation during contests and DXing activities. Users report improved key responsiveness and reduced key chatter, which is crucial during high-pressure operating conditions. Regular cleaning can prevent oxidation and buildup, which can lead to erratic key performance. This product is essential for serious operators who rely on their equipment for successful communication.

Die kontestgruppe dk0bn

The structure of this dual band VHF UHF antenna is very simple. It consists of two identical square loops, whose sides measure a quarter wave, connected together at the ends. A project by I5NZR

Gimme Five reloaded, a compact 5 band QRP SSB transceiver in SMD technology. This unit covers 5 bands within the amateur radio spectrum (3.5, 7, 14, 21 and 28 MHz). Receiver is a single conversion unit with an interfrequency of 9 MHz. Transmitter uses 5 stages and has got a power level of 10 watts PEP output.

Reivews of the Icom IC 7100 HF VHF UHF transceiver

Vacuum tubes and more from the tubular years

One common semiconductor material, silicon, is far more widely used in electronics than germanium, partly because it can operate at much higher temperatures. Semiconductors are crystalline materials with electrical resistivity values between conductors and insulators, whose conductivity can be altered through _doping_ with impurities like arsenic or phosphorous to create N-type (excess electrons) or P-type (electron vacancies) materials. Semiconductor devices, such as diodes, transistors, and integrated circuits, leverage these properties to control electron flow in circuits. A diode, a two-terminal device with an anode and cathode, primarily permits current flow in one direction, making it useful as a rectifier to convert AC to DC. Specialized diodes include Zener diodes for voltage regulation and Light-Emitting Diodes (LEDs) that produce light when current passes through them. Logic circuits, fundamental to digital electronics, have binary inputs and outputs, performing functions like AND, OR, and NOT gates, and can be constructed from various binary devices including solid-state diodes and transistors. A transistor is an active semiconductor device with at least three terminals (base, emitter, collector), capable of amplifying current. Integrated circuits (ICs), often called chips, are electronic circuits built on a semiconductor substrate, typically silicon. ICs are classified by transistor type (bipolar or MOS) and integration scale: Small-Scale Integration (SSI) with fewer than 10 transistors, Medium-Scale Integration (10-100), Large-Scale Integration (LSI) with 100-1,000, and Very-Large-Scale Integration (VLSI) with more than **1,000** transistors. ICs can be analog, digital, or hybrid, offering virtually limitless functions.

On December 12, 1901, Guglielmo Marconi successfully received the first transatlantic wireless communication, a Morse code "S" (three dots), at 04:30 GMT. This article details the setup for this groundbreaking experiment, noting Marconi's receiver in St. John’s, Newfoundland, Canada, utilized a _coherer_ and an antenna elevated by balloons and kites. The transmitting station at Poldhu, Cornwall, England, featured twenty-four 200-foot ships' masts and a 25-kilowatt alternator. The resource explains how this contact disproved contemporary beliefs about radio wave limitations due to Earth's curvature, later understood through _ionospheric propagation_. It frames Marconi's achievement as the "very first DX" in amateur radio terms, defining DX as telegraphic shorthand for distance and _DXing_ as the hobby of receiving distant signals. The article also provides external links for further reading on Marconi's experiments and the science behind transatlantic radio signal reception.

Raivavae Austral Islands by Don, VE7DS and Dave, K3EL as TX5RV

A 30 Meter, Discrete Component CW Transceiver Built Manhattan-style

Electronic compoenents manufacturer of precision CMOS analog integrated circuits for OEMs of industrial controls, computers, instrumentation, automotive, and telecom. Transistor mosfet.

This is a compact three transistor regenerative general coverage receiver with fixed feedback. The sensitivity and selectivity is relative good, especially on the LF and MW bands, as can be expected with this simple design.

233BG001 Stephane Homepage - News about 11M Band.

The history of radio documented in thousands of publications including copies of popular US and UK amateur radio magazines and newsletters since 1930s

Accessing antennas at great height poses many potential safety hazards. Essentially, climbing ladders or scaling towers, regardless of whether or not a commercial safety harness is fitted, is risky business indeed particularly for those hobbyists in their latter years or not as physically capable as others.

Bird Technologies, The RF Experts - manufacturer of Analyzers, Attenuators, Terminations & Loads, Duplexer and Triplexers and RF Wattmeters

Conneaut Amateur Radio Club Ohio W8BHZ yahoo group

The official announcement of the Icom IC-7610 mid class amateur radio transceiver

A new ham finding his way in the hobby

Solution for stations located at secondo floor or higher. Lead lengths to the grounding system are much too long to provide a low-impedance RF ground.

Single operator two radios, resources controllers and products

Radio comunication dealer based in Moscow Russia

A rotary dipole antenna for 30 meters band. Each arm is about 12.5 ft and is constructed from telescoping fibreglass flag/fishing poles and short lengths of aluminium tubing. Two short lengths of glass-fibre rod were used to insulate the arms from the supporting hardware.

While there are quite a few standalone Morse Code or CW decoders out there, I wanted to tackle the problem myself and end up with both a great Arduino learning project and a decent portable decoder for when I'm out in the field operating QRP

Club in Cleveland, White County, Georgia, promoting friendship, mutual assistance, and learning.

A travel group for hams. Join Ham Buddies for fun breaks and make new friends with other hams. Ham buddies enjoy travel and get to talk radio for fun while on holidays.

N4L design and manufacture versatile, high-accuracy, easy to use instruments for power electronic test & measurement

Virtual Signal/One Radio Museum

Paulding county's oldest and largest ham club. Skywarn

The problem with making your own trapped HF antennas is usually getting the coaxial traps tuned to frequency. This article explains a method using a RF signal generator at +10dBm output into the coaxial trap.

MCRCA Monroe County Radio Communications Association

Personal HamRadio Blog

Homemade a custom programming cable that can works with Kenwood TM-V71A or TM-D710A

Tektronix Oscilloscope Tutorial Learning Center, includes tutorials for understanding oscilloscope basics and operation.

This page displays the current ionogram and tries to determine the nearest digisonde report to your location. Data coming from this sondes are used to determine the MUF for oblique propagation on HF spectrum

Scan Antenna supply precision antennas to some of the world’s most advanced, market leading companies. Their antennas fit in satellite voice/data, mobile/wireless GSM, GPS, marine/land based radio and other specialty systems.

Thsi article describes a microcontroller driven semi-automatic antenna tuner capable of handling power levels up to 150 watts. The device is a low pass filter tuner manually tuned by setting the optimized L/C combination by hand and then storing the values into the EEPROM of the mictrocontroller to recall them later (seperately for each band from 80 to 10 meters including WARC bands)

A WSPR beacon project based on Arduino nano (atmega328P) based microcontroller