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The project details a DIY SWR/Wattmeter designed around an _Arduino Uno_ shield, providing capabilities to measure RF power from 2 to **200 watts** and Standing Wave Ratio (SWR) for HF amateur radio bands. This construction features a compact design, integrating the measurement circuitry directly onto a custom PCB that interfaces with the Arduino Uno microcontroller. Key components include a directional coupler for sensing forward and reflected power, precision rectifiers, and analog-to-digital conversion for processing RF signals. The Arduino firmware handles calibration, calculations, and displays the results on an integrated LCD, offering real-time feedback on antenna system performance. The design prioritizes simplicity for homebrewers. Performance specifications indicate accurate readings within the **2-200W** power range, suitable for typical QRP to medium-power HF operations. The project provides schematics and a basic overview of the software logic.

iSDR is a software defined radio application compatible with the Apple iPhone, iPod touch and iPad. iSDR is designed for experimenters, shortwave listeners, and amateur radio enthusiasts who would like a truly portable software-defined radio receiver.

Audio Kit is a collection of four iphone applications which are essential for those working in audio and sound. A real time Spectrum Analyser, a Scope to display waveforms, an SPL Meter, and a sine wave Signal Generator.

CallBook is an Amateur Radio application that allows you to look up call signs via the free WM7D server, the QRZ Online subscription service or the HamCall subscription server and track active APRS stations on www.aprs.fi. Lookup results can be emailed and the QTH can be instantly viewed in the Maps application

Satellite tracking on the iPhone/iPod touch. Track and predict visible satellite passes. Touch a satellite in the map view to see it’s orbit path and location.

Amateur Radio License exams are composed of questions from a pool. Use this application to practice all possible questions prior to taking your exam

HF Weather Fax lets you receive marine weather radiofascimile transmissions on your iPad, iPhone and iPod Touch. Just connect it to a shortwave radio tune in a weather fax frequency, and watch the images come in.

A circuit which had been used in many other application before. The configuration described here is optimized for IPHONE/radio operation.

PocketSat3 satellite tracking software for iPhone, iPad, and Android devices

Iphone app for ncdxf IARU beacon monitoring, shows the currently transmitting beacon on each band, reception charts from the active monitoring stations, and latest solar flux A and K indices

Connecting the iPad or the iPhone to a Yaesu FT-817 using an home made cable, using common digital modes like PSK31 RTTY and SSTV. Article by Andrew VK3BQ

CommCat Mobile is a free integrated spot management, remote radio control, and logging app for the iPhone. CommCat is required for remote control.

Decode Slow Scan TV (SSTV) on your iPad, iPhone and iPod Touch by Blackcatsystems

Iphone App with list of nearby repeaters in the UK, along with details of input and output frequencies, a map, and a handy bearing arrow for each repeater.

iPhone Software to practice taking your Ham Radio Exam

ACARS decoder app for the iPad, iPhone, and iPad Touch

UK Repeaters is an iPhone app that shows all UK Based repeaters on a map. Each repeater information is shown to allow easy access and programming of your radio

The only worldwide amateur radio repeater directory. Supports Android, iPhone, web, RT Systems, CHIRP GPS enabled. AvMap, Garmin, TomTom

iOS EchoLink client, this free app will allow licenced ham radio operators to use iPhone, iPad or iPod devices to connect to the echoLink system and connect to repeaters or other echolink users.

Amateur radio log book for iOS devices, including iPad and iPhone. Featuring several advanced logging functions, including export to ADIF, DX Cluster access, LoTW eQSL interface and more

Master the Ham Radio license exams with Ham Technician, Ham General and Ham Extra! With these free iPhone applications, you will take the test with confidence.

Friis-It NF is the first iPhone OS based application that allows you to calculate noise figure, system sensitivity, and cascaded gain for an RF Receiver system

Display and Send Hellschreiber On Your iPhone and iPad - iPhone / iPad app to send and receive Hellschreiber

A free repeater database app for iPhone and iPad includes repeaters from 35 different countries and is available in 5 languages

Official aprs.fi iOS app, immediate real-time visibility to APRS traffic near you and around the world.

Decode DTMF from your iPhone. Hold your smartphone close to a DTMF source and this app will decode the numbers being dialled.

Vox recorder is activated by voice and sounds exceeding a threshold. It saves for every record a .caf file that you can play, delete or send by email. Useful for surveillance records, hamradio scanners, and many many other applications. You'll be surprised to hear what happens in an all night using Vox recorder.

MeshCom 4.0 facilitates off-grid text messaging and data exchange via _LoRa_ radio modules, operating on low-power, low-cost hardware to establish networked communication capabilities. The system transmits messages, GPS positions, sensor values, and telecontrol data over significant distances with minimal power consumption. MeshCom modules can autonomously form a mesh network or integrate into a broader message network through MeshCom gateways, which ideally connect via _HAMNET_ to link disparate radio networks. Recent updates include MCMAP features, support for Lilygo T-Connect-Pro, and new firmware for T-ECHO, enhancing the system's versatility. The project provides basic specifications, detailed protocol information, and installation instructions for MeshCom 4.0, including guides for RAK WisBlock and HELTEC V3 hardware. Firmware and companion Android/iPhone applications are available for download, supporting a range of **10-20 km** line-of-sight communication.

Demonstrates a LoRa APRS Tracker project featuring a comprehensive menu system for message management, weather requests, and monitoring nearby trackers. The device supports adjustable display eco mode and screen brightness, optimizing power consumption by dynamically changing processor speed from 240MHz to 80MHz. GPS beacons are encoded for efficient RF transmission, and an OLED screen displays altitude, speed, course, _BME280_ weather data, or new message counts, along with recently heard stations. Bluetooth connectivity enables operation as a TNC with Android (APRSdroid) or iPhone (APRS.fi app), providing LED and sound notifications for transmissions and received messages. The integrated BME280 module facilitates weather data display and transmission, with Winlink mail support via _APRSLink_. The tracker can switch between **three major LoRa APRS frequencies** worldwide, offering versatile global operation.