In this section you will find detailed description of my homemade amateur radio radio equipment, mainly two-way radios for single sideband modulation (SSB). Also known as “QRP” radios. But also a lot of microcontroller-related material. Please keep in mind that the designs are free for non-commercial use and for educational purposes. Any commercial exploitation would violate this copyright. Thank you!
Simple GPS-Decoder (NMEA) with STM32F4 using USART 
A simple way of decoding NMEA/GPS-signals with an STM32F411-MCU will be described. Software in Embedded C also will be discussed with a special stress on proper USART baudrate calculation.
A Dual Audio Frequency Generator with 2 DDS modules
This project replaces the analog 2-tone oscillator described in a former project. Equipp
ed with 2 AD9850 DDS ICs and an STM32F microcontroller it provides much more precise setting and variation of the frequency of the 2 audio tones used for testing the linearity of an SSB transmitter.
“Gimme Five” reloaded – A compact 5 band QRP SSB transceiver in SMD technology
(Bands: 3,5MHz, 7MHz, 14MHz, 18MHz, 21MHz)
Oscillators, Microcontroller (MCU)
Transmitter
Receiver
Software
An experimental HF 6-band SSB transceiver
(Bands: 1.8MHz, 3,5MHz, 7MHz, 14MHz, 21MHz, 28MHz)
Hardware
- Basic outline
- Oscillators
- Microcontroller
- Band Switching
- Measurement units
- Receiver
- Transmitter
- T/R Switching
- Mechanics
Software
High performance transceiver for voice communication on 14MHz
- Circuit, Schematic and Discussion
- Software source in Embedded C
Transmitter Improvement
Software
A “lean design” SSB-Transceiver for 14 MHz
The “Cigarette Pack” Transceiver (14MHz, SSB, 4Watts PEP)
A mid-power portable/handheld SSB transceiver for 14MHz
Circuit, Schematic and Discussion on Oscillators
Going back in time: “Old school” transceiver for 20 meters with 20 watts of output
The “Micro42” – Another “shirt pocket” SSB transceiver.
(7MHz)
Circuit, Schematic and Discussion
The „Micro20 III“ – A Simplified Pocket Size SSB Transceiver for 14 MHz
Circuit, Schematic and Discussion
My 1st “Shirt-pocket” transceiver (re-engineered)
An ultra compact QRO transceiver for 40 Meters with
50 to 70 watts output power
- Basic outline
- Overview/Block Diagram
- Receiver Front End, 1st Mixer
- IF Amplifier
- Productdetector, Audio Section, AGC
- Transmitter (article missing 🙁 )
- Receiver Improvement
QRP SSB multiband transceiver (5 bands/10 Watts PEP)
A compact handheld QRP SSB transceiver for 14 MHz
