NanoVNA Test Jig: A Practical Guide for Accurate RF Measurements

NanoVNA Test Jig: A Practical Guide for Accurate RF Measurements: Learn how a NanoVNA test jig improves RF measurement accuracy. Detailed guide covering applications, crystal testing, filter evaluation, and RF prototyping etc.

Crystal Radio Explained – How to Build Your Own No Power Radio

Crystal Radio Explained – How to Build Your Own No Power Radio: Explore crystal radio: learn how they work, their historical significance, and how to build your own. A fun, educational dive into early radio tech!

DIY Programming cable for a Motorola GM 300 series two-way radio

DIY Programming cable for a Motorola GM 300 series two-way radio: Programming cable for a Motorola GM 300 is a device that allows to connect Motorola GM 300 two-way radio to a computer so that one can program it.

Programming Motorola GM300 and GM338 with homemade cable

DIY Motorola Programming: Save Money & Build Your Own Cable! 🔌

Radio enthusiasts often struggle with the "Motorola tax"—expensive, hard-to-find programming cables for legacy gear. But if you have a GM300 or GM338, you don’t need to buy one!

VU3DXR has published a great walkthrough on creating a homemade programming cable. Whether you're setting up a repeater or just putting a local frequency into your mobile rig, this DIY solution is a lifesaver.

What’s inside: ✅ Pinout diagrams for GM300 & GM338. ✅ Circuit interface details. ✅ Tips for successful communication with the radio.

Read the full guide here: 👉 https://vu3dxr.in/programming-motorola-gm300-and-gm338-with-homemade-cable/

#MotorolaRadio #HamRadio #DIY #ProgrammingCable #GM338 #GM300 #RadioRepair #VU3DXR

Simple CW 74HC240 Transmitter using buffer IC

High Performance, Low Part Count: The 74HC240 CW Transmitter 📻⚡

Looking for a fun weekend project? This guide by VU3DXR shows how to repurpose a common 74HC240 Octal Buffer IC into a surprisingly effective CW (Morse Code) transmitter.

By using the gates within the IC, you can create a stable oscillator and a power amplifier stage that delivers enough "flea power" for some serious QRP (low power) fun. It’s an excellent way to learn about RF design and digital-to-analog applications.

Key highlights: ✅ Uses a common, inexpensive logic IC. ✅ Simple circuit architecture—great for beginners. ✅ Perfect for QRP enthusiasts and homebrewers.

Full schematics and build details here: 👉 https://vu3dxr.in/simple-cw-transmitter-using-the-74hc240-buffer-ic/

#HamRadio #QRP #MorseCode #CW #Electronics #HomebrewRadio #VU3DXR #DIYElectronics

Build Your Own Micro Power AM Transmitter!

Build Your Own Micro Power AM Transmitter!: Ever wanted to broadcast your own tunes or messages a short distance? This simple Micro Power AM Transmitter circuit, based on the design from Techlib.com, is a fantastic way to get started with radio electronics! This compact circuit is designed for short-range transmission, perfect for experimenting or creating your own miniature broadcasting station. At its heart, it uses a few common transistors and passive components to generate a stable radio frequency and modulate it with your audio input.

Bring Back the Magic of Radio! 📻✨

Ever wanted to broadcast your own audio over the AM band? I just came across this fantastic DIY guide by VU3DXR on how to build a Micro-Power AM Transmitter.

Whether you’re a seasoned Ham radio operator or a curious hobbyist, this project is a perfect way to dive into RF electronics. It’s simple, effective, and a great weekend build for anyone looking to learn about modulation and signal transmission.

Check out the full circuit diagram and step-by-step instructions here: 👉 https://vu3dxr.in/build-your-own-micro-power-am-transmitter/

#HamRadio #DIYElectronics #AMTransmitter #RadioProjects #MakerMovement #VU3DXR #STEMProjects

Dynamic speech compressor with audio preamplifier

Dynamic speech compressor with audio preamplifier: Dynamic speech compressor or simply audio compression is an audio signal processing operation that reduces the volume of loud sounds or amplifies quiet sounds

Simple two stage one watt AM transmitter

Simple two stage one watt AM transmitter: This is a simple two stage transistor one watt AM transmitter for the HF which gives watt in output using easily available transistor like BD139 in final stage.

FM Bazooka Antenna for Superior FM Radio Reception (88–108 MHz)

FM Bazooka Antenna for Superior FM Radio Reception (88–108 MHz): FM Bazooka antenna for 88–108 MHz offers low noise, wide bandwidth, and excellent FM DX reception using simple coaxial construction.FM radio antenna

Slim-Jim Antenna for FM Broadcast Band reception (88–108 MHz)

Maximize your FM radio signal with the power of a Slim Jim Antenna! 📡🎶

If you are looking for a high-performance, budget-friendly DIY project to improve your 88–108 MHz reception or broadcast range, the Slim Jim is a game-changer. Unlike standard dipoles, this end-fed folded dipole offers a lower angle of radiation, directing more energy toward the horizon where you actually need it.

Why choose the Slim Jim?

• High Gain: Significant improvement over a standard ground plane antenna.

• Low Noise: Integrated matching section helps reduce man-made interference for a cleaner signal.

• Weatherproof & Portable: Easily house your build in a PVC pipe to protect it from the elements.

• Custom Tunable: Precision measurements for 88, 92, 96, 100, 104, and 108 MHz.

Whether you are a DXer trying to catch distant stations or a local broadcaster optimizing your setup, this guide provides the exact dimensions and wiring steps to get the job done. 🛠️📻

Check out the full technical breakdown, wiring diagrams, and frequency charts here: 👉 https://vu3dxr.in/slim-jim-antenna-for-fm-broadcast-band-reception-88-108-mhz/

#FMRadio #SlimJimAntenna #HamRadio #DIYAntenna #RadioBroadcasting #VU3DXR #AntennaDesign #TechDIY

Understanding the Bazooka Coaxial Dipole Antenna Design

Understanding the Bazooka Coaxial Dipole Antenna Design: Bazooka Coaxial Dipole antenna design explained with dimensions, theory, and calculations for 2m, AIS, 1.25m, and UHF ham bands using coaxial dipole principles.

Dual-Band RW4HFN Antenna for 145/430 MHz bands

Dual-Band RW4HFN Antenna for 145/430 MHz bands: This dual-band RW4HFN antenna that allows amateur radio operators to transmit and receive on both the 2-meter (145 MHz) and 70-centimeter (430 MHz) bands.

VK3YE’s AGC circuit for ubitx

VK3YE’s AGC circuit for ubitx: VK3YE’s AGC circuit for ubitx uses a conventional audio AGC circuit which drives a LED that is optically coupled to a Light Dependent Resistor (LDR).

Simple mic compressor using 3 Transistors for HF rigs

Simple mic compressor using 3 Transistors for HF rigs: Simple mic compressor using 3 Transistors is a effective, compressor circuit that can be used to improve the dynamic range of a microphone signal.

Build Your Own Commando AM Transmitter

Build Your Own Commando AM Transmitter: Build your own Commando AM Transmitter circuit with 3 transistors. Complete guide covers Q1 oscillator, Q2 buffer & Q3 amplifier stages.

Build Your Own 40M AM Transmitter: A Classic Radio Project

Build Your Own 40M AM Transmitter: A Classic Radio Project: This blog post delves into the construction of a 40M AM transmitter. Perfect for hobbyists offers a fantastic hands-on experience with RF electronics.

Build Your Own Hidden Transmitter Hunter RF Sniffer Circuit

Build Your Own Hidden Transmitter Hunter RF Sniffer Circuit: Discover how to build a hidden transmitter hunter using a simple RF snifter circuit. Ideal for transmitter hunts and bug tracking with minimal components.

Simple UJT Morse Code Practice Oscillator Circuit

Simple UJT Morse Code Practice Oscillator Circuit: Learn to build a simple UJT Morse code practice oscillator with basic components. Perfect beginner electronics project for ham radio enthusiasts.

Mosquito TRX: Single-MOSFET 40-Meter (7030 kHz) CW Transceiver

Mosquito TRX: Single-MOSFET 40-Meter (7030 kHz) CW Transceiver: Detailed explanation of Mosquito TRX circuit. Learn how the IRF510acts as crystal oscillator/PA for QRP transmission and direct conversion mixer for 7030 kHz

W5GI Multiband Collinear Antenna: A Proven HF All-Band Wire Antenna

W5GI Multiband Collinear Antenna: A Proven HF All-Band Wire Antenna: W5GI multiband collinear antenna explained. Covers 80–6m with tuner, better than G5RV, construction details, coax sections, and real-world performance.

DIY 3-Transistor FM Bug Transmitter Using Piezo Mic

DIY 3-Transistor FM Bug Transmitter Using Piezo Mic: This compact and low-power 3-transistor FM bug Transmitter circuit is perfect for DIY enthusiasts and RF hobbyists. It uses a piezo buzzer as a microphone.

Simple Incandescent Lamp Flasher Circuit Using 7555 Timer

Simple Incandescent Lamp Flasher Circuit Using 7555 Timer: Build a simple incandescent lamp flasher using a 7555 timer and MOSFETs. Ideal for DIY projects with adjustable flash rate and low parts count.

DIY 3-Transistor FM Bug Transmitter Using Piezo Mic

DIY 3-Transistor FM Bug Transmitter Using Piezo Mic: This compact and low-power 3-transistor FM bug Transmitter circuit is perfect for DIY enthusiasts and RF hobbyists. It uses a piezo buzzer as a microphone.

Log audio Compressor Circuit for Smooth Natural Compression

Log audio Compressor Circuit for Smooth Natural Compression: Build a log audio compressor circuit using BC549 transistors and diodes for smooth signal compression over a 60 dB range. Ideal for mic-level signals.

Build Your Own Hidden Transmitter Hunter RF Sniffer Circuit

Build Your Own Hidden Transmitter Hunter RF Sniffer Circuit: Discover how to build a hidden transmitter hunter using a simple RF snifter circuit. Ideal for transmitter hunts and bug tracking with minimal components.

Build a Simple Speech Processor Circuit Using LM358

Build a Simple Speech Processor Circuit Using LM358: Learn how to build a simple speech processor circuit using LM358 op-amp. Ideal for amateur radio, audio processing, and voice compression application.

DIY 1 MHz AM Transmitter: A Perfect Weekend Project for Beginners

DIY 1 MHz AM Transmitter: A Perfect Weekend Project for Beginners: Basics of radio frequency by building a simple 1 MHz AM Transmitter. This guide explains the circuit design and secrets of amplitude modulation for hobbyists

Sleeve Dipole Antenna Design Using Coaxial Cable – A Technical Deep Dive

Sleeve Dipole Antenna Design Using Coaxial Cable – A Technical Deep Dive: Learn how a sleeve dipole antenna works. This technical guide explains the function of the radiating element, coaxial skirt, and the best dielectric materials

Building an FT8 Digital Interface – Dive into Digital Modes

Building an FT8 Digital Interface – Dive into Digital Modes: This blog post examines a well-designed FT8 digital interface circuit that provides both audio coupling and PTT (Push-to-Talk) control.

Exploring the LILYGO T-Embed SI4732 Radio Receiver

Exploring the LILYGO T-Embed SI4732 Radio Receiver: The LILYGO T-Embed SI4732 is a compact, feature-rich development board that combines the power of the ESP32-S3 microcontroller with the versatile SI4732

Building Steve Quest’s Simple AM Transmitter

Building Steve Quest’s Simple AM Transmitter: Steve Quest AM Transmitter, a popular and relatively straightforward design for hobbyists. It is a is fun to build and teaches basic radio principles

Simple CW 74HC240 Transmitter using buffer IC

Simple CW 74HC240 Transmitter using buffer IC: This is a simple but effective CW 74HC240 transmitter design using a octal buffer IC 74HC240 as the main component, operates at 7.023 MHz .

Build Your Own 40M AM Transmitter: A Classic Radio Project

Build Your Own 40M AM Transmitter: A Classic Radio Project: This blog post delves into the construction of a 40M AM transmitter. Perfect for hobbyists offers a fantastic hands-on experience with RF electronics.

Build Your Own Micro Power AM Transmitter!

Build Your Own Micro Power AM Transmitter!: Learn how to build a simple Micro Power AM Transmitter for short-range audio broadcasting. Great for beginners exploring amplitude modulation and radio circuits

Integrating JTDX with sBitX for Advanced FT8 Operation

Integrating JTDX with sBitX for Advanced FT8 Operation: Learn how to integrate JTDX with sBitX v3 for advanced FT8 operation, including PSK Reporter spotting, eQSL logging, and superior weak-signal decoding.

TL071 Audio Compressor Circuit

TL071 Audio Compressor Circuit: Build a TL071 audio compressor circuit for guitar effects and recording. Complete guide with diode recommendations 1N4148 and 1N5817 for optimal performance.

Build Your Own Simple Sine Wave Oscillator

Build Your Own Simple Sine Wave Oscillator: sine wave oscillator specifically generates a smooth, periodic oscillation that resembles the mathematical sine function.

Ham Radio Repeater Toneburst Module circuit

Ham Radio Repeater Toneburst Module circuit: Ham Radio Repeater Toneburst Module generates a precise 1750Hz toneburst lasting 0.5 seconds, essential for accessing UK and European amateur radio repeaters.

Build Your Own Solar Powered Radio

Build Your Own Solar Powered Radio: Solar cells can easily provide enough power to operate a small radio receiver. This Solar Powered Radio project is an ideal set to take away on holiday.

Flashing Firmware in ATS Mini Radio: A Simple Firmware Update Guide

Flashing Firmware in ATS Mini Radio: A Simple Firmware Update Guide: Flashing Firmware in ATS Mini refers to the process of installing or updating firmware on the ATS Mini DSP Radio, is a tiny digital signal processing radio

The Ultimate DIY Guide to Setting Up a GOES-R Series Satellite Receiver for High-Resolution Weather Imagery

The Ultimate DIY Guide to Setting Up a GOES-R Series Satellite Receiver for High-Resolution Weather Imagery: Introduction to GOES-R The GOES-R series (Geostationary Operational Environmental Satellite-R) represents NOAA's latest generation of weather satellites, including GOES-16 (GOES East) and GOES-17/18 (GOES West). These satellites transmit high-resolution weather imagery and atmospheric data that can be received by amateur radio operators and weather enthusiasts using relatively affordable equipment. Key Benefits: Real-time weather imagery updated

Simple High-Gain collinear antenna using coaxial cable

Simple High-Gain collinear antenna using coaxial cable: Detailed explanation of the coaxial collinear antenna using coax cable. Learn the working principle, dimensions, construction method, and real-world performance

Mini-Radio Firmware V3 Adds RTTY/CW Decoding and EiBi Integration

Mini-Radio Firmware V3 Adds RTTY/CW Decoding and EiBi Integration: Mini-Radio Firmware V3 by H. J. Berndt introduces built-in RTTY and CW decoding along with EiBi schedule integration, enhancing SI4735-based portable receivers.

27MHz AM Transmitter Circuit for hobbyists

27MHz AM Transmitter Circuit for hobbyists: Explore the classic 27MHz AM Transmitter circuit. Learn about its oscillator, modulation, and power stages to build your own radio projects.

Tiny FM Transmitter with Just a Few Easy-to-Find Components

Tiny FM Transmitter with Just a Few Easy-to-Find Components: Learn how to build a compact Tiny FM transmitter using 2N3904, a few passive parts, and a simple air-core coil. Perfect for DIY electronics enthusiasts

DIY Active Antenna: Boost Weak HF/VHF Signals

DIY Active Antenna: Boost Weak HF/VHF Signals: DIY Active Antenna for superior HF and VHF reception! This DIY electronics project amplifies weak signals to lift hard-to-hear broadcasts out of the noise

The Ultimate DIY Guide to Setting Up a GOES-R Series Satellite Receiver for High-Resolution Weather Imagery

The Ultimate DIY Guide to Setting Up a GOES-R Series Satellite Receiver for High-Resolution Weather Imagery: Introduction to GOES-R The GOES-R series (Geostationary Operational Environmental Satellite-R) represents NOAA's latest generation of weather satellites, including GOES-16 (GOES East) and GOES-17/18 (GOES West). These satellites transmit high-resolution weather imagery and atmospheric data that can be received by amateur radio operators and weather enthusiasts using relatively affordable equipment. Key Benefits: Real-time weather imagery updated

sBitx v3: The Linux SDR That Refuses to Be Boring

sBitx v3: The Linux SDR That Refuses to Be Boring: In-depth sBitx v3 review with real-world operation, specs, strengths, and flaws. A Linux-based HF SDR radio built for experimentation.

After picking up the sBitx v3 from HF Signals at the recent LARC8 event in Hyderabad, I’ve spent considerable time exploring it—not just on-air, but under the hood. This is not merely another HF transceiver competing with commercial brands. The sBitx v3 is something fundamentally different: a Linux-powered SDR platform that happens to be a radio.

For many Indian hams who grew up building, modifying, and dreaming over Ashhar Farhan VU3ESE‘s legendary Bitx designs, the sBitx feels like the natural and ultimate evolution of that legacy. It carries the same experimental DNA, just updated for the Raspberry Pi era.

DIY 145 MHz Twin Delta Loop Antenna for Ham Radio Operators

DIY 145 MHz Twin Delta Loop Antenna for Ham Radio Operators: A complete guide to building 145 MHz Twin Delta Loop antenna with dimensions, construction tips, feeding method, and performance advantages for VHF ham radio.

How to Build a Reduced Size 40M Antenna – Complete DIY Guide

How to Build a Reduced Size 40M Antenna – Complete DIY Guide: Build a compact reduced Size 40M Antenna using PVC spacers and simple materials. Get full measurements, design diagram, assembly steps, and tuning tips

VHF Radio Receiver Antenna Amplifier Using MAX2633 – Simple Low-Noise RF Preamplifier Design

VHF Radio Receiver Antenna Amplifier Using MAX2633 – Simple Low-Noise RF Preamplifier Design: A complete guide to building a VHF radio receiver antenna amplifier using the MAX2633 low-noise RF preamplifier chip with schematic explanation

PhaseLatch Mini: An Affordable STM32-Based SDR Digitizer for Radio Experimenters

PhaseLatch Mini: An Affordable STM32-Based SDR Digitizer for Radio Experimenters: PhaseLatch Mini is an STM32-based SDR digitizer with dual 12-bit ADCs and 210 kS/s USB I/Q streaming for ham radio, HF/VHF listening, and SDR experimentation.

VHF Radio Receiver Antenna Amplifier Using MAX2633 – Simple Low-Noise RF Preamplifier Design

VHF Radio Receiver Antenna Amplifier Using MAX2633 – Simple Low-Noise RF Preamplifier Design: A complete guide to building a VHF radio receiver antenna amplifier using the MAX2633 low-noise RF preamplifier chip with schematic explanation

Morgain Antenna: Dual-Band Dipole that Beats Traps

Morgain Antenna: Dual-Band Dipole that Beats Traps: Build high-performance HF Morgain antenna with accurate dimensions and simple construction. Complete guide with diagrams, spacing, materials, and tuning tips.

Shortened Vertical Antenna for the 80-Meter Band (UR0GT Design)

Shortened Vertical Antenna for the 80-Meter Band (UR0GT Design): Compact 4-meter 80-meter band shortened vertical antenna by UR0GT explained—design, loading coil, tuning details, and coax-based matching network.

A Broadband Butterfly Antenna for VHF and UHF

A Broadband Butterfly Antenna for VHF and UHF: Learn about the Square Loop Antenna (also called the butterfly antenna), a simple, broadband, bidirectional antenna with excellent gain.

RA9SUS Simple Loop Antenna covering 14–30 MHz

RA9SUS Simple Loop Antenna covering 14–30 MHz: Detailed explanation of the RA9SUS simple loop antenna covering 14–30 MHz, with tuning method, construction tips, and real-world HF performance.

RW4HFN Balcony Antenna for the 20-Meter Band

RW4HFN Balcony Antenna for the 20-Meter Band: Discover the RW4HFN balcony antenna design for the 20-meter amateur radio band—ideal for limited spaces. Includes schematic, dimensions, and inductance values

Dual-Band RW4HFN Antenna for 145/430 MHz bands

Dual-Band RW4HFN Antenna for 145/430 MHz bands: This design is a highly practical dual-band RW4HFN antenna that allows amateur radio operators to transmit and receive on both the 2-meter (145 MHz) and 70-centimeter (430 MHz) bands using one compact assembly. This design functions as a center-fed element on the lower band and exhibits multi-mode characteristics on the higher band, providing excellent versatility for fixed or portable operation. It is intended to be fed with a 50 Ohm Coaxial Cable.

Building an FT8 Digital Interface – Dive into Digital Modes

Building an FT8 Digital Interface – Dive into Digital Modes: This blog post examines a well-designed FT8 digital interface circuit that provides both audio coupling and PTT (Push-to-Talk) control.

Ribless Programming cable for Motorola GM360/GM338 radio

Ribless Programming cable for Motorola GM360/GM338 radio: Programming cable for Motorola GM360 is intended to use with the usb port for motorola GM360 radio and other motorola radios like GM300/GM338/GM300/GM380/GM640.

SSM2167 Microphone Preamplifier with compression for ubitx HF Transceiver

SSM2167 Microphone Preamplifier with compression for ubitx HF Transceiver: The SSM2167 is a low-noise audio amplifier with compression and noise gating features. It can be used in the uBitx HF tcvr to improve audio quality of signal

OpenSourceSDRLab PortaRF: The Next Evolution in Portable Software-Defined Radio

OpenSourceSDRLab PortaRF: The Next Evolution in Portable Software-Defined Radio: The OpenSourceSDRLab PortaRF is ultimate portable SDR, integrating the HackRF and PortaPack into one device. Explore its architecture and key features

LARCSet kit – Most Affordable SSB/CW Transceiver Kit Released

LARCSet kit – Most Affordable SSB/CW Transceiver Kit Released: Amateur radio enthusiasts have something exciting to celebrate this holiday season. The LARCSet, described as the world’s most inexpensive SSB/CW transceiver kit, is now available for purchase, with shipping beginning December 15th. LARCSet promises to rekindle the spirit of DIY in the ham-radio community by giving amateur radio enthusiasts a highly affordable, build-it-yourself radio — ideal for hobbyists, beginners, and tinkerers alike