Portable HAM radio station
Operating Modes/Portable Operations
Guide to setting up a portable ham radio station, selecting the right components and buying the correct ones, finally setting up and assembling the whole elements.
ARRL Audio News February 17, 2023
ARRL Audio News for February 17, 2023
Resistor combination finder
Technical Reference/Calculators
If you need a non-standard resistor value you could probably realize a close match using two resistor. If you use two resistor in series it is quite easy to figure out which values give the best match; on the other hand, using a parallel connection it is not so easy (at least for me) to find a good combination.
This resistor calculation tool shows which combinations of two resistors (series or parallel) gives a match better than the closest standard value, for the E12 (10%), E24 (5%) and E96 (1%) series.
Two elelemts Telescopic Yagi for 2 Meters
Antennas/2M
A lightweight PVC hand-held telescopic 2 element 2m (145 MHz) yagi using two pairs of TV rabbit ear antennas as the driven and reflector elements. Approximate directional gain is 5dB.
ARRL Headquarters will be Closed on Monday, February 20, 2023
ARRL Headquarters will be closed on Monday, February 20, 2023, for Presidents’ Day. There will be no W1AW bulletin or code practice transmissions on that day. ARRL HQ will reopen on Tuesday, February 21, at 8 AM EST.
The Mount Vernon Amateur Radio Club of Alexandria, Virginia will celebrate the 291st birthday of George Washington at Mount Vernon, the former plantation of George Washington and h...
QRP Dummy Load
Technical Reference/Dummy Loads
This is another variation on the parallel resistor, dummy load. It is perfect for QRP HF operation of 5-watts or less average power, and should be adequate for continuous operation at that level. It's light and compact, about 2-1/2 in length overall.
W4LHS The Coastal Amateur Radio Society
160-80-40 Metre Trapped V-Dipole
Antennas/Dipole
A Trapped dipole inverted V antenna for lower HF Bands. Construction details are for temporary installation. Permanent installations will require additional ruggedising and waterproofing however the basic electronics concepts remain the same. This project includes SWR plots for the three bands and pictures details of the homemade traps.
An introduction to YIG Tuned Oscillators
Technical Reference/Test Equipment/Signal Generator
The YIG Tuned Oscillator (YTO) is the only direct signal source to provide multi octave tuning bandwidths in excess of 10 GHz. Common tuning ranges are from 2-10 GHz, 8-18 GHz and 10-20 GHz. YTO is are also
known for their superior phase noise and exceptional tuning linearity.
Amateur Radio Events Celebrate the Universe
Two amateur radio events are scheduled in mid-February to celebrate an astronomer who mapped the universe and an astronomer who discovered a planet.
The Northern Arizona DX Association (NADXA) has been conducting a 10-year special event countdown to the 100-year anniversary of Pluto's discovery. The planet was spotted in 1930 by Clyde Tombaugh at the Lowell Observatory in Flagstaff, Arizona. Thi...
CY0S Sable Island DX Pedition
DX Resources/DX Peditions/2023 DXpeditions
CY0S Sable Island DX Pedition March 20-29, 2023
Registration Open for the 2023 QSO Today Virtual Ham Expo
The 2023 QSO Today Virtual Ham Expo will be held on March 25 - 26, and registration is now open.
The event is a fully interactive virtual ham radio convention offering new content, networking opportunities, and more than 50 amateur radio presentations on a wide variety of subjects.
There is still time to participate in the event as a presenter. You can submit an application to present a video on ...
70 cm Repeater Project
Technical Reference/Repeater
Multi Mode 70cm DIY Repeater Build Project made with two Tait TM8235 and acting as modem a Repeater Builders MMDVM plus a Raspberry PI
ARRL Audio News February 10, 2023
ARRL Audio News February 10, 2023
Amateur Radio Active in Turkey and Syria Following Earthquakes
In the days following the 7.8 magnitude earthquake and aftershocks that hit Turkey and Syria on February 6, 2023, emergency communications have been active with rescue and response efforts.
The emergency communications group Türkiye Radyo Amatörleri Cemiyeti (TRAC) is coordinating primary communications.
The designated primary disaster communication frequency is 28.540 MHz (USB). In addition, 3.7...
Bouvet Island DXpedition is On the Air!
The 3Y0J team has arrived and begun operations on Bouvet Island. The conditions have been difficult and the team is not yet operating at full capacity.
The 3Y0J Media Officer and East Coast Pilot, Steve Hass, N2AJ, wrote on Facebook that, as of Wednesday, February 8, 2023, the team has only enough power to operate two radios simultaneously. A storm is forecasted to bring high winds to the remote...
UK Scanner Frequencies
Radio Scanning/Regional/Europe
UK frequency list provide reference table to lister to Police scanner channels UHF VHF, Amateur Repeaters, Ambulance CB Radio CoastGuard Rescue, marine VHF, Military and more.
Amateur Radio on the International Space Station Contacts two US Schools
Astronauts on board the International Space Station (ISS) were busy the last week of January using amateur radio to make contact with two schools.
The Amateur Radio on the International Space Station (ARISS) program arranged contacts with Brentwood Magnet Elementary School in Raleigh, North Carolina, and Norwich Free Academy (NFA) located in Norwich, Connecticut.
On January 26, 2023, nearly 400 s...
Z Match with Toroid
Antennas/Tuners
A single coil Z-Match. This QRP version by G3WQW, using a T130-2 toroidal inductor and polyvaricon variable capacitors was published in Sprat 84.
End-Fed Half-Wave Antenna for 20m 40m 80m
Antennas/End-Fed/End Fed Half Wave Antenna
How to Design and Build a Field Expedient End-Fed Half-Wave Antenna for 20m, 40m and 80m. This Shorty 80m EFHW comprises a 49:1 autotransformer (to match the very high impedance at the end of a half-wave wire), a half-wavelength wire for 40m (also a quarter-wavelength for 80m), a loading coil and a short tail wire. The coil and the short tail wire (about 6 feet) make up the other quarter wave on 80m.
Create CLP-5130-2N VHF/UHF Antenna
A one antenna solution for all those who don't have the space or resources for multiple VHF and UHF antennas.
Emergency Communications Due to Earthquake in Turkey
On Monday evening February 6, 2023, there was a 7.8 magnitude earthquake that mainly affected Turkey and Syria but also other neighboring countries with 3,700 people dead and more than 16,000 injured until the last hours, but it is suspected that there are more. According to information received from the emergency coordinators of the IARU R1 countries and, especially from Greg Mossop, G0DUB, th...
How to find out if your choke works
Antennas/Feed Lines/Choke
How many times have you heard the advice to coil a few turns of coax at the antenna end to form a choke. How to find out if your common mode current choke really works
ARRL Foundation Accepting Applications for Grants in February
The ARRL Foundation is now accepting applications for grants to amateur radio organizations. The grants program awards limited funding to organizations for eligible amateur radio-related projects and initiatives, particularly those with a focus in educating, licensing, and supporting amateur radio activities. Youth-based projects and initiatives are especially encouraged. The ARRL Foundation gr...
Los Angeles County Disaster Communications Service
Here you will be able to access all of the information regarding our amateur radio disaster relief communications organization, its divisions and volunteer members
ON7LR-ON4LIR-OTxA
Radioclub, Clubstation, Conteststation
3Y0J Log Online
DX Resources/Log Analysis
3Y0J Club log Log Online page for Bouvet Island DXPedition 2023. Logs will be uploaded when conditions will permit.
Diamond V2000a Antenna
Triband Base Antenna for 6m 2m 70cm bands.
2m to 70cm Transverter Circuit
Technical Reference/Transverters
A 70cm / 432 MHz Transverter Project transverter circuit is an electronic device that converts a radio signal from the 2 meter to the 70 centimeter band and vice versa, allowing a single transmitter/receiver to be used for both bands. It consists of an IF stage, local oscillator, frequency multiplier, and amplifier. The circuit must be designed for minimal signal loss, noise and intermodulation distortion.
Phased Array Antennas
Antennas/Array
Phased array antennas are composed of multiple individual antenna elements that can have their phase and amplitude controlled to steer the main beam direction in real-time. They are used in radar, communications, and electronic warfare, and offer improved gain and reduced side lobes. A comprehensive document on Phased Arrays include techniques to increase the Antenna Gain and change the Radiation Pattern
Hamilton county police scanner frequencies
Radio Scanning/Scanner Frequencies
Scanner Frequencies for Chattanooga / Hamilton County. Chattanooga Police Talkgroups, Chattanooga Fire / Rescue Talkgroups, Chattanooga City Services Talkgroups, police, Hamilton County Sheriff Talkgroups
Yaesu introduces the new FTM-500D Series
FTM-500D Series 50W C4FM/FM 144/430MHz, Dual Band Digital Mobile Transceiver.
Top Amateur Radio Websites - Issue 2306
WinRFCalc Free Windows RF Calculator, Learning Morse Code by the Koch Method, USA Amateur Radio Repeaters, County-Hunting Mapper, Aerial Printing Concepts, GW4ARC Rhyl and District Amateur Radio Club,
Leadership Changes in ARRL Atlantic Division
The ARRL Atlantic Division has new leadership. Tom Abernethy, W3TOM, who had served as an ARRL Director, representing the Atlantic Division since 2015, stepped down on January 6, 2023.
(left to right) ARRL President Rick Roderick, K5UR, recognized Bob Famiglio, K3RF, and Marty Pittinger, KB3MXM, as the new Director and Vice Director, respectfully, of the Atlantic Division during the ARRL Board o...
ARRL Audio News February 3, 2023
ARRL Audio News February 3, 2023
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