Iowa State club launching experimental repeater today
High altitude balloon will make FM contacts possible across the Midwest.
Minnesota Ham Radio

Machine learning enhanced FM digital voice
Transmitted over the air (OTA) using commodity FM UHF radios.
FreeDV

Prototype 2el Yagi for Radiosonde fox hunting
The design is for a two element Yagi using a Half Folded Half Wave Dipole driven element and reflector.
owenduffy.net

Open-weather apt
A browser-based decoder for automatic picture transmissions (apt) from satellites NOAA-19, NOAA-18 and NOAA-15.
Open-weather

POTA has a REST API
A Python script for tracking the parks near you that you haven’t activated yet.
Copasetic Flow

KSKO’s one man, full-time operation connects interior Alaska
Alongside the McGrath studio, a collection of seven repeater stations and two partner stations broadcast widely — across stretches up to 150 miles.
Alliance of Rural Public Media

AI noise removal from off-air single sideband
It should be possible to do this sort of processing in near to real time.
marxy’s musing on technology

Why we designed the high school direct conversion receiver
We might have used a variable capacitor but variable capacitors are now expensive and hard to source.
SolderSmoke Daily News

VLF receive loop
More verticality?
Real-World Amateur Radio

AI generated Ham Radio song
With the help of AI, I chose a slightly different musical arrangement for a more universal version.
RADIOSCOPE

Video

Ham Radio for Hackers
Some people consider ham radio operators to be the original hackers.
HOPE XV

2-meter operations above the cloud deck
Flight from KTIW to W27 over a blanket of cloud cover due to a temperature inversion.
W7NY

25th annual SKYWARN Recognition Day December 7
SRD was established in 1999 by the National Weather Service and ARRL to commemorate the contributions of SKYWARN volunteers.
ARRL

The best Raspberry Pi Ham Radio projects
Go boxes, cyberdecks, Pi-rate radios, and more.
ALL3DP

MorseLink: Chat online by Morse Code
Supports automatic key mode and manual key mode.
MorseLink

Shortwave radio: A unique collection from the Cold War era
The Chuck Vesei Shortwave Radio Artifacts collection has hundreds of items received from shortwave broadcasters from 1984 to 1986.
Internet Archive

South American satellite pirates
A clandestine network of individuals who have ingeniously tapped into retired UHF MilSat bands.
Vapor95

US Amateur License demographics update
District 7 states by far have the most operators per capita.
SupremeVinegar

Adding radials to a mag mount
In this configuration, I got the SWR down to about 1.2:1. Success!
WB3GCK

SatPathFinder for iOS
There is a special option for radio amateurs to calculate sked times.
Mac Ham Radio

The “Universal TCXO”
A TCXO is a device that improves the absolute frequency stability and accuracy of a radio.
KA7OEI

Video

All Parks Oklahoma
US-7686, Lake Elmer state fishing lake.
KJ5APW

AMSAT OSCAR 7: The little satellite that could
Take a trip with me as we tell the tale of the “miracle” satellite.
Retro Rockets

Drama, farce, a Radio Ham and the Baker Street bank heist
A gang tunnelled into a secure vault while all the time being listened to by an Amateur Radio operator.
BBC

Ham Radio for Hackers
All the seats were filled because they actually wanted to learn more about Amateur Radio!
KB6NU

Dwingeloo telescope tests 8.4 GHz reception
We successfully detected the carrier signal of three Mars orbiters: Tianwen-1, MAVEN, and MRO.
Dwingeloo Radio Telescope

Repeater Builder: So you want to build a repeater
The largest repeater information site in the world.
Repeater Builder

Calibrating the KX2 by ear
I’ve got two radios I can just use them to test myself, without having to deal with propagation and everything else.
GM5ALX

POTA on Ellis Island
Planning, plotting, and activating.
QRPer

HamClock
A fun, fast Ham Radio project.
PE4BAS

QO-100 Log Parser
Simple ADIF log conversion tool for QO-100 satellite contacts.
SQ8W

The design and test of a filtered low noise amplifier
An LNA can help improve the reception of an SDR by reducing the noise figure of the system, and by overcoming losses from long coax cable runs.
RTL-SDR

Mapping the ionosphere with millions of phones
Millions of Android phones can provide an accurate picture of the ionosphere in areas of the world underserved by conventional infrastructure.
Nature

Video

LongChat: QRP Ham Radio text chat
Chirp signals for power efficient messaging.
LongChat

An intro to LoRa APRS
10 km range with 20 milliwatts.
LB0FI Norwegian Hamventures

The 52 Week Ham Radio Challenge – 2025
This is meant to inspire you to extend your horizon in Amateur Radio.
DJ5CW

The cavity duplexer [PDF]
If you are like many Hams and two-way radio professionals, you likely have more questions about duplexers than answers.
W6NBC

Packet radio fun on the Mac: A beginning
Packet radio on a Mac Mini and an Icom IC-7300.
KC8JC

Packet radio build: Windows Server configuration for BPQ32 and Winlink
It stands on much more solid ground than running a specific wine version, with a very old version of .net, or hacking together a client to stop all updates.
The Modern Ham

Commercial HF Radio
Cisco Systems holds a license that lists their San Jose and Research Triangle Park campuses, besides a nationwide mobile location.
Computers Are Bad

Deep Space Exploration members competing in Ham Radio competition
The Deep Space Exploration Society will utilize their 60’ dish for ARRL’s EME contest.
Kiowa County Independent

HamSCI Newsletter volume 1, number 1
Issues contain news about past and future HamSCI happenings, such as research projects, in-person meetings, and on-air events.
HamSCI

Six weeks and 7300 miles: Activating on the road
A driving trip across the United States and back that included activation of Parks on the Air (POTA) entities in 21 states.
QRPer

Video

From NASA missions to Ham Radio
Dr. Patricia Reiff W5TAR shares her journey.
W1DED

Parks on the Air step-by-step
A complete real-time guide to a POTA activation.
KB9VBR

Microcontrollers are just radios in disguise
Ways to leverage every cycle of underpowered microcontrollers to get them doing the work of parts ten times their price.
Hackaday Supercon 2024

Zinc creep and electroplasticity
Why Arecibo collapsed.
Hackaday

What’s new at Digital Library of Amateur Radio & Communications
The 50 MHz DX Bulletin, the Ohio/Penn DX Bulletin, Numbers & Oddities Newsletter, The Telegraphic Journal and Electrical Review, and more.
K6KJN & Zero Retries

HamSpace.me: The social media alternative for the Ham Radio Community
HamSpace.me is looking for a new maintainer. Contact KI6DTC if you can help.
HamSpace.me

Open Source FT8 transceiver
A highly portable stand-alone FT8 GUI Transceiver.
WB2CBA

How to build a radio
Using analog tech to teach kids about STEM.
LAist

Slinky antenna revisited
It was soon discovered that connecting two Slinkys end-to-end significantly boosted the antenna’s efficiency.
K0PIR

WKHS makes international contact with Amateur Radio
Chris Singleton, broadcasting teacher and manager of the high school’s radio station 90.5 FM WKHS, introduced students to Amateur Radio.
Radio World

Video

The haunted band workshop
A presentation, review, and Q&A for proposed rulemaking to the US FCC for Restoring Amateur Radio Service use of the 219 MHz Band.
Open Research Institute Inc.

Radio receiver using old TV tubes
Superregenerative FM / VHF radio receiver using electronic tubes PCF82 and PCL85.
Perian Marcel

Introducing the Faraday Cloth Antenna
The Fara-J – a cutting-edge 2m-70cm Ham Radio antenna crafted from Faraday cloth.
Ham Radio Rookie

MFJ ends reign as king of Ham Radio parts
It was rough trying to say goodbye.
Mississippi Clarion Ledger

IC-9700 contest keyboard
An Arduino based IC-9700 Contest Keyboard allows a PS2 keyboard to drive an Icom IC-9700 or any modern CI-V radio for contesting.
VK3FS

Podcast: Ham’s Radio Ham Ham English
A Japanese radio program for Ham Radio enthusiasts by Ham Radio enthusiasts.
JA1WTO

Homebrew sferics receiver
Sferics, short for atmospherics, are RF signals in the VLF range generated by the millions of lightning discharges that strike the Earth daily.
Hackaday

Propagation experiments: Signal strength vs. tide levels
The lack of a relationship can in fact be new information.
Copasetic Flow

POTA activation report: Poor Common
There are dozens, if not hundreds of places in the UK called “Poor Common.”
Ian Renton

Mediumwave ferrite antenna for RX
In limited urban conditions its performance is sufficient.
SWLing Post

Video

Quick tour of CBC / Radio Canada satellite facilities
Visiting the CBC studios in Montreal.
saveitforparts

Home made Quansheng UV-K5 desktop transceiver
Turning the handheld Quansheng UV-K5 VHF/UHF transceiver into a desktop transceiver.
OM0ET

Linked elevated radial system
Game-changing antenna performance.
KB9VBR

How to build a Ham antenna for under $8.00
Building a Ham Radio antenna is easy.
My Ham Radio Journey