Hamvention: Thousands flocking to Xenia this weekend for Amateur Radio show
Last year’s attendance was 35,000, more than the population of the entire city of Xenia.
Dayton Daily News

ARRL seeks entry-level HF privileges in FCC proposal
Amateur Radio association said filing reflects need to update rules for digital modes.
RadioWorld

ARRL renews defense of the 902-928 MHz Amateur Radio band
The FCC is considering a petition by NextNav, Inc., a licensee in the 900-MHz Location and Monitoring Service (LMS), to reconfigure the 902-928 MHz band.
ARRL

Record-breaking participation in 2025 Amateur Radio exam in Bangladesh
More than 900 participants took part in an examination organized by the Bangladesh Telecommunication Regulatory Commission.
QRZ

Pile-up speedbumps: The QSO Killers
Disruptions in a pile-up arise when DX hunters deviate from the expected rhythm of a standard QSO.
Delta Alfa

Radio apocalypse: Meteor burst communications
The world’s militaries have always been at the forefront of communications technology.
Hackaday

Matching an EFHW antenna – a third way
Despite the advantages, the EFHW has its critics.
Ham Radio Outside The Box

Khanfar software: RTL-SDR CFAR mask analyzer
This powerful tool combines advanced Constant False Alarm Rate (CFAR) algorithms with innovative Frequency Mask Trigger (FMT) techniques to provide reliable signal detection even in challenging RF environments.
RTL-SDR

Video

Bird feeder HF antenna
A balcony-anchored “motorized bird feeder” antenna with amazing radials.
Ham Radio Perspectives

HamSCI: Space weather we can do together
What’s next for HamSCI, including new developments in the HamSCI Personal Space Weather Station project.
RSGB

This ambulance Is actually a mobile Ham shack
From HF radios and power distribution to antennas and off-grid capability.
Broken Signal

Meshtastic Event firmware for Dayton Hamvention 2025
Last year’s mesh chaos? We remember 😅 This year, we’re ready for it.
Meshtastic

Zero Retries Digital Conference 2025 call For papers
Technical papers are sought for the in-person inaugural Zero Retries Digital Conference (ZRDC).
Zero Retries

Announcing 2025 award recipient: Sebastian Delmont (KI2D)
Ham2K Portable Logger, a groundbreaking project, has been selected as the winner of the 2025 annual Amateur Radio Software Award.
Amateur Radio Software Award

The sun’s 100-year “Gleissberg Cycle” is waking up
The next few solar cycles could be even more intense.
spaceweather.com

How to process an Earth-Venus-Earth radar return signal
Each transmission was 278 seconds long. This time span was selected because it equaled the expected round-trip time from Earth to Venus and back.
Open Research Institute

What is M17?
Open Source gives you freedom: freedom to enjoy, freedom to innovate, and freedom to use the M17 protocol.
Random Wire

Tornado siren test net
Tracking down maintenance issues during these tests is a small but essential part of emergency preparedness.
W8EMV

Fixing an antenna at the top of a 35-foot tower
The problem: Jim’s antenna wasn’t performing well.
Ham Radio Prep

Ham Radio Day ignites STEM curiosity in Northwest Ohio
Amateur Radio is full of career choices! It can lead you in so many directions.
The Village Reporter

Islanders say they cannot escape the mysterious humming
Islanders in the Outer Hebrides say their lives are being disrupted by a mysterious low frequency humming sound that can be heard day and night.
ICQ Podcast

Video

Inside ARDC: Bdale KB0G on funding the future of Ham Radio
The private foundation quietly reshaping the future of Ham Radio.
Q5 Worldwide Ham Radio

Mobile antenna lift using a linear actuator
For about 50 bucks and a little time, raising and lowering mobile antennas is a breeze.
WB6JWB

10 keys to selling used Ham Radio gear
How to sell used Amateur Radio gear safely and successfully.
Ham Radio Perspectives

Yaesu releases FTX-1 series radios [PDF]
HF/50/144/430MHz all mode field and base station transceivers.
Yaesu

IP400 Ichiban – The Big Reveal
An initial production run of 25 IP400 Ichiban units, paired with Raspberry Pi Zero 2 Ws, with the latest software on a MicroSD card, are in production.
Zero Retries

QSO specific F2 visualization
We know the F2 heights all over the world at the time of each QSO.
Copasetic Flow

NOAA 15, 18, 19 end of life announcement
Transmissions will continue for hobbyists.
RTL-SDR

Build a single transistor amplitude modulation & demodulation circuit
With explanation of how it all works.
KM1NDY

What does your contesting keyboard look like?
With most contesting programs the F keys on your keyboard are used for sending specific macros.
VE9KK

Put an old-school BBS on Meshtastic radio
Microsocial media comes to LoRa.
IEEE Spectrum

Are multi-carrier data modes illegal in Amateur Radio?
Organizer of the Amateur Cellular project has a concern about Ham LTE.
Open Research Institute

JARL commemorative station 8K3EXPO at Expo 2025
JARL will promote the event across Japan and the world.
Amateur Radio Daily

Tunnel radio: How signals reach drivers underground
With leaky cables, a look at how motorists stay tuned in during tunnel trips.
RadioWorld

Video

Mount your Ham Radio beam on top of a tree
A fabulous Amateur Radio story 60-feet up.
Ham Radio Perspectives

Understanding HF direction finding
A technical introduction to the three most common methods used in HF direction finding.
Rohde & Schwarz

Exploring the Caged Hen-Delta Antenna
This is a versatile ‘little’ loop antenna with a tiny turning radius, surprising DX performance, and stunning broadband qualities when caged.
AEOEN

First look at the HF Signals zBitx QRP Transceiver
An all-mode 80-10m QRP radio with a waterfall and weighing under 1 pound for under $200 USD shipped.
QRPer

Connecting the dots: Protecting and improving Amateur Radio access to 219-220 MHz
The twin challenges: Interference and regulatory burden.
Open Research Institute

Could Agent Sonya have done it? (It: QRP CW on 40 meters in 1939)
I believe Agent Sonya could have constructed the rig.
Copasetic Flow

We just lost the moon
Whether or not the global Amateur Radio community has any “buddies” in the Chinese space program, we need to make some.
KE9V

1946 Philips 170A-15 RadioBerry receiver project
Build a nice shortwave receiver for the radio shack based around the RadioBerry HAT on a Raspberry Pi 4 housed in a vintage receiver cabinet.
M0AWS

Ham Radio for preppers
I want to help expand knowledge of people, in particular those who want to become Amateur Radio Operators, and Preppers.
Ham Radio for Preppers

In an uncertain time, Ham Radio sees a signal boost
Amateur Radio enthusiasts have been preparing for emergencies for decades. Now their expertise is drawing packed rooms of newcomers.
INDY Week

Italian Radio Amateurs can use 70 MHz (4m) and 40 MHz (8m) band until end of 2025
The 70.200 MHz segment coincides with the SSB centre of activity.
EI7GL

Bid on a piece of NYC radio history
Alford FM antenna elements from Empire State Building go to auction.
RadioWorld

Video

Best POTA sites around Dayton
The five best POTA sites to activate while you are in town for Hamvention.
K8MDB

SDR Television
A DVB-S2 / AAC / H264 / H265 program for use on the QO-100 satellite.
Tech Minds

ARRL files comments responding to FCC request for input
It is hoped that the Commission will incorporate worthy suggestions in a future Notice of Proposed Rulemaking (NPRM) later this year.
ARRL

FCC’s “Delete, Delete, Delete”
Is Ham Radio at risk?
Ham Radio Prep

Will tariffs affect the cost of Ham gear?
An analysis from Connect Systems.
KB6NU

Geomagnetic ground currents in North America
On April 16th, a severe geomagnetic storm caused electricity to flow through the rocks and soil of North America.
SpaceWeather.com

Tuning into innovation: How Ham Radio is powering scientific curiosity
On World Amateur Radio Day, we explore how this timeless tech continues to inspire innovation, build inclusive communities, and promote hands-on science education.
The New Indian Express

Three mysterious new shortwave stations approved in the U.S.
Past filings and meeting summaries suggest possible ties to high-frequency financial data transmissions, a purpose not authorized under current broadcast rules.
SWLing Post

Small talk, from afar
Students are trying to revive the Harvard Wireless Club.
Harvard Magazine

Wayne’s solution for sealing outdoor RF connectors
Consider the benefits of double-walled heat-shrink tubing.
RadioWorld

A Pi-based LiDAR scanner
Although there are plenty of methods for effectively imaging a 3D space, LiDAR is widely regarded as one of the most effective methods.
Hackaday

Extended hours for Voice of America Museum during Hamvention
Our Amateur Radio station WC8VOA will be on the air to operate.
Amateur Radio Daily

Video

What happened to Heathkit? The Ham Radio legend that vanished
Educating, entertaining, and helping radio enthusiasts to learn more about the history and stories behind the technology we enjoy.
Ham Radio Gizmos

Steam in the crater at Mount Saint Helens with Ham Radio operations
2-Meter FM Ham Radio operations were conducted throughout the flight.
W7NY

Ham community frets in “Delete, Delete” comments
Nearly 300 commenters have already flooded the FCC’s website since Chairman Brendan Carr asked for public input on ways to eliminate burdensome regulations.
RadioWorld

Announcing Zero Retries Digital Conference 2025
The presentations at ZRDC will showcase technological innovation in Amateur Radio such as are typically discussed in the Zero Retries newsletter.
Zero Retries

ISS SSTV April 11-16 – Humans in Space
April 12 is the International Day of Human Spaceflight so, what better theme for the April 11-16 Slow Scan TV transmissions.
AMSAT-UK

RAC will not attend Hamvention this year
At its meeting on March 27, 2025, the Board of Directors of Radio Amateurs of Canada voted unanimously to cancel RAC’s plans to operate a booth at Hamvention.
Radio Amateurs of Canada

In college, I founded an FM station. It’s 50 years later…
With a lot of help from some other students, a couple of faculty members and two administrators, we got this across the goal line right after I had graduated. Here’s how it went.
K4FMH

World Amateur Radio Day is April 18
It was on this day in 1925 that the International Amateur Radio Union was formed in Paris.
IARU

Ham radio turns 100 in South Africa
The South African Radio League (Sarl) wants to broaden its contribution to the growth of Amateur Radio in sub-Saharan Africa as the organisation celebrates its centenary next month.
TechCentral

What is IRLP?
Today, there are IRLP nodes all over the planet in frequent (sometimes constant) use.
The Random Wire

Bugs and the toupee fallacy
The Toupee Fallacy is a logical fallacy in which one thinks something is of poor quality because they only notice poor quality instances of it.
Radio Artisan

Video

Ham Radio space comms with the Arrow II antenna
Here I take my first venture into LEO satellites with the well known, Arrow II dual band hand held Yagi antenna.
Tech Minds

Proposed: Only 2 Amateur Radio license classes
A Response to the FCC and an invitation to discuss.
Ham Radio Perspectives

How to teach a one-day Tech class
This is a recording of a Zoom presentation to the Holmesburg Amateur Radio Club on Saturday, April 4, 2025.
KB6NU

Fram2 makes first Amateur Radio contact from a SpaceX spacecraft
Rabea Rogg (LB9NJ) became the first astronaut and Amateur Radio operator to make contact with Earth from a SpaceX Dragon spacecraft.
Amateur Radio Daily

FCC filing for 219 MHz rules changes from ORI
Open Research Institute (ORI) has filed the first of what might be several comments and proposed rules making efforts to the FCC about reforming Amateur Radio use of the 219 MHz band.
Open Research Institute

You’ve been warned
I just couldn’t get comfortable above about 18 words per minute.
KE9V

25 years a Ham and still learning
I felt an urge to experiment – to contribute something useful to the science of radio communications.
Ham Radio Outside the Box

Save the dates: HamSCI Meteor Scatter QSO Party
The target storms are in August 11-12 (Perseids) and December 12-13 (Geminids).
HamSCI

Letter: Here’s a copper theft mystery
You just can’t make this stuff up.
RadioWorld

SSTV capsule V2 for high altitude balloons
This project has been above 30km high sending images in real time using SSTV technology. All of this using free to use PMR walkies.
Autodesk Instructables

The zBitx: Many flaws
Four days with the zBitx has been an exercise in frustration.
AE5X

Local Amateur Radio operators keep track of “trekkers”
Mike knew there was a need for radio communications along the Micco Trail as cellphone reception can be spotty.
Highlands News-Sun

Video

Can you predict how far your VHF/UHF radio will reach?
The basics of creating real-world radio coverage maps using free tools.
Ham Radio Rookie

Quickly deploy a BBS
Simple packet BBS server deployment.
The Tech Prepper

AO-7: The satellite that refused to die
It’s tough to fit 50+ years of remarkable history into 26 minutes.
AE4JC