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!


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)

Oscillators, Microcontroller (MCU)

Transmitter

Receiver

Software

An experimental HF 6-band SSB transceiver

(Bands: 1.8MHz, 3,5MHz, 7MHz, 14MHz, 21MHz, 28MHz)

Hardware

Software

High performance transceiver for voice communication on 14MHz

Transmitter Improvement

Software

A “lean design” SSB-Transceiver for 14 MHz

 

 

 

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

Micro QRP Transceiver for SSB 14 MHz by DK7IH

 

 

 

 

 

A mid-power portable/handheld SSB transceiver for 14MHz

Circuit, Schematic and Discussion on Oscillators

Mid-power SSB transceiver for 14MHz - DK7IH 2021

 

 

 

 

 

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 Micro42 - A really pocket sized SSB QRP transceiver for 7MHz

 

 

 

 

 

 

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

SSB transceiver for 40 Meters with 50 Watts of output

50 to 70 watts output power

QRP SSB multiband transceiver (5 bands/10 Watts PEP)

Final assembly of the 5 band 10 watts QRP SSB transceiver( (C) 2016 Peter Rachow - DK7IH)

 

 

 

 

A compact handheld QRP SSB transceiver for 14 MHz

A handheld compact SSB QRP transceiver for 14 MHz (20 meter band) by Peter Rachow (DK7IH)

Circuit, Schematic and Discussion