Amateur radio projects
1. Start here
What's radio construction about and how to get started
Parts needed for electronics and radio construction
The four pieces of radio test equipment you really need
Building projects from the schematic diagram - A one transistor crystal oscillator
Introducing the Pixie Hack Challenge
2. Receiving projects
A simple crystal set (and Q multiplier)
Almost solderless crystal set (video)
Variable inductor crystal set drives a speaker (video)
Novel crystal set requires no antenna, earth
An electret microphone crystal set (video)
Crystal set with high gain TL431 audio amplifier (video)
All bands at once portable AM receiver (video)
12 part AM radio drives a speaker (video)
Regenerative AM receiver
Thousand hour AM receiver (video)
One valve regenerative receiver operates from 12 volts HT video 1 video 2
Converting an AM broadcast receiver to hear 160 metres
Building and testing a no coils AM radio (video)
Experimenting with the BK1198 receiver IC (Digitech AR1458 conversion)
Simple 3 - 23 MHz HF regenerative receiver (video)
Experiments with ceramic resonator regenerative receivers
3.5 MHz direct conversion
receiver
3.5 MHz superhet receiver
Super simple 7 MHz receiver and notes on RF breakthrough (video)
One transistor direct conversion reflex receiver concept (video)
One transistor direct conversion reflex receiver concept - refined (video)
Demonstration of a chopping board HF receiver as described in Sprat (video)
Starting in simple software defined radio
Simple FT8 and JS8 direct conversion receivers
Ring modulators and Dalek kits for voice scrambling, shifting and sideband inversion
Binaural and phasing SSB receiver experiments
Hear Amateurs on your shortwave radio (BFO)
LF to HF converter
High quality AM through your FM stereo
Hear Amateurs on your FM
radio
Car radio tunes the
amateur bands
1.8 MHz to 27 MHz receiving converter (video)
7 MHz to 27 MHz receiving converter (video)
27 MHz to 3 MHz receiving converter (video)
Superregenerative receivers for the FM broadcast band
70 MHz to 50 MHz receiving converter (video)
50 MHz to 146 MHz
converter
What can you hear on a VHF 'crystal set'? (video)
Portable VHF superregen receiver (video)
144 MHz to VHF airband receiving converter (video)
Taming a 144 MHz direct conversion receiver (video)
TV tuner VHF receiver - Part 1 (video)
TV tuner VHF receiver - Part 2 (video)
TV tuner VHF receiver - Part 3 (video)
Glass CW audio filter (video)
3. Transmitting projects
Very low power broadcast 'AM' with 2 transistors (video)
Low power broadcast MF FM with 3 transistors (video)
Micropwer FM broadcast transmitter with pins and wood (video)
1000km range with a 3.5 MHz crystal oscillator module transmitter? (video)
Frequency agile 3.5 MHz CW transmitter
3.5 MHz DSB transmitter
Review of and improvements to the Pixie QRP CW transceiver
A page of super simple 1 & 2 transistor 3.5 & 7 MHz CW transmitters
Your first radio transmitter you built yourself - no soldering (video)
Your first radio transmitter can now talk (video)
'Tiny Toy' 7 MHz CW transceiver (video)
'Bigger Toy' 7 MHz CW transceiver (video)
7 MHz ceramic resonator CW transmitter - receiver (video)
Very simple 7 MHz AM transmitter using TL431 audio amplifier (video)
7 MHz frequency agile 2 transistor FM exciter (video)
Badly behaved 7 MHz frequency agile 4 transistor FM exciter (video)
7 MHz FT8/JS8 direct conversion DSB transceiver
Diodes as DSB transmitter finals (high level balanced modulator)
'Micro 40' 7 MHz DSB transceiver
'Beach 40' 7 MHz DSB transceiver
'Knobless Wonder' single channel 7 MHz SSB transceiver
Tips and tricks for the Bitx SSB transceiver
Tips and tricks for the uBitx SSB transceiver
Phasing SSB experiments
One Valve CW
transmitter
Two Valve CW
transmitter
Experiments with low power 27 MHz and VHF transmitters
Experiments with low power UHF transmitter modules
Tests with low power video transmitter circuits
Wide-swing variable crystal
oscillator
Tinkerings with DDS VFOs
4. Accessory and test equipment projects
Quick Android - transceiver interface cable for digital modes (video)
Automatic CW CQ caller using an Arduino (video)
Utility discrete transistor audio amplifier
Signal strength meter uses LM386 IC (video)
Antenna couplers galore!
Audible antenna coupler adjustment indicator
Squeakie audible RF field strength meter (video)
QRP power meter
Tweak your RF power meter - here's how (video)
Switchable 3.5 and 7 MHz QRP low pass filter (video)
RF actuated transmit indicator light for QRP rigs (video)
RF actuated CW monitor
Handheld transmitter and range testers
Getting simple DSB transceivers to talk to one another (video)
LED voltage indicator for under a dollar (video)
A two-way Morse practice set
Build a simple Morse keyer in 10 minutes (video)
Morse adaptor for your VHF/UHF FM rig
Simple test equipment to build
Measure UHF frequencies with wood, wire and nails (video)
Measure inductance with just two transistors (video)
Dip oscillator for HF
3 - 12 MHz Signal generator
CMOS IC audio
oscillator
Dual tone audio
oscillator
1A variable regulated power
supply
An electronic stupidity meter (video)
5. Further information