Amateur Radio Transceivers and Equipment

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. 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!

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A Dual Audio Frequency Generator with 2 DDS modules

This project replaces the analog 2-tone oscillator described in a former project. Equipped 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)

• Introduction to the project
• Band layout modification

Oscillators, Microcontroller (MCU)

• VFO, LO and MCU

Transmitter

• Basic layout
• Practical setup
• Results/Spectrum Analysis

Receiver

• Design and Circuit

Software

• Source code in Embedded C.

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

• Software source in Embedded C

High performance transceiver for voice communication on 14MHz

• Circuit, Schematic and Discussion
• Software source in Embedded C

Transmitter Improvement

• More Output Power
• Curing Instabilities

Software

• Software Source Code in Embedded C

A “lean design” SSB-Transceiver for 14 MHz

• Circuit, Schematic and Discussion

 

 

 

The “Cigarette Pack” Transceiver (14MHz, SSB, 4Watts PEP)

• Review and reconstruction

• Previous version

 

 

 

 

 

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

• Circuit, Schematic and Discussion

 

 

 

 

 

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)

• Circuit, Schematic and Discussion
• First version of this radio

 

 

 

 

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)

• Circuit, Schematic and Discussion
• Details in construction

 

 

 

 

A compact handheld QRP SSB transceiver for 14 MHz

Circuit, Schematic and Discussion