Howdy and Welcome!

Because content of my site grew more and more, I have re-organized and re-designed this website. To make orientation easier, underneath a tree-view based display of the content of my website can be used to find topics and navigate. Should you have any questions, comments or you would like to buy a radio kit, components or other material, please mail

peter(at)dk7ih.de !

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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Latest entry: A “Walkie-Talkie” SSB transceiver for 14MHz or higher rf bands (now available as a kit!) (May 2022)

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Amateur radio equipment

QRP-Transceivers/Two-way radios for SSB modulation

With analog VFO

• • • • • A mid-power portable/handheld SSB transceiver for 14MHz
        • Going back in time: “Old school” transceiver for 20 meters with 20 watts of output
        • A “lean design” SSB-Transceiver for 14 MHz with analog VFO

With digital VFO

Multiband

• • • • • • • • “Gimme Five” reloaded – A compact 5 band QRP SSB transceiver for 1.8, 3.5. 7, 14 and 18MHz
              • An experimental HF 6-band SSB transceiver for 1.8, 3.5, 7, 14, 21, 28 MHz
              • QRP SSB multiband transceiver (5 bands/10 Watts PEP) for 3.5, 7, 14, 21 and 28 MHz

Monoband

Handheld/”Walkie-Talkie”

• • • • • • • • • • A “Walkie-Talkie” SSB transceiver for 14MHz or higher rf bands (also available as kit!)
                  • A compact handheld QRP SSB transceiver for 14 MHz
                  • A mid-power portable/handheld SSB transceiver for 14MHz

Station transceivers

• • • • • • • • • • • High performance transceiver for voice communication on 14MHz
                    • The “Cigarette Pack” Transceiver (14MHz, SSB, 4Watts PEP)
                    • The “Micro42” – Another “shirt pocket” SSB transceiver.
                    • The „Micro20 III“ – A Simplified Pocket Size SSB Transceiver for 14 MHz
                    • My 1st “Shirt-pocket” transceiver (re-engineered)
                    • An ultra compact QRO transceiver for 40 Meters with

Test equipment

• • • A simple 2-tone-generator for testing the linearity of SSB transmitters
    • A Dual Audio Frequency Generator with 2 DDS modules
    • Cheap and dirty measurement of filter response curves

Antennas and Tuners

• • • A semi-automatic antenna tuner for QRP use
    • Reviewing and improving the semi-automatic antenna tuner
    • The semi-automatic antenna tuner – Version 1b
    • Improved matching for 20-meter-band rod antenna
    • Mounting a rod antenna to a homemade handheld QRP transceiver
    • An easy-to-build rod antenna for 14 MHz (20 meter band)

Literature by Peter (DK7IH)

• • • Das QRP-Baubuch (3rd edition, German language only, 1993)

Microcontroller related material

Digital radio frequency generation (DDS etc.)

• • • Programming the AD9834 DDS chip
    • A simple software to control the Si5351A clock generator chip (Version for STM32F4)

Tutorials, Algorithms etc.

• • • Simple GPS-Decoder (NMEA) with STM32F4 using USART
    • Tutorial: Register Programming of the STM32F4/ARM-Cortex-M4 Microcontroller
    • Direct FM generation with fast MCU and parallel DDS
    • Decoding time station signals (DCF77 etc.) with a microcontroller
    • Interfacing colored LCD ILI9341 with 8-bit Microcontroller
    • Decoding NMEA data from a GPS module with a microcontroller
    • Interfacing an LCD12864 (ST7920 controller) to a microcontroller
    • Interfacing an analog temperature sensor to an AVR microcontroller

Scuba diving

• • • An open source dive Computer (Buhlmann ZH-16 algorithm)

Remote controlling, telemetry etc.

• • • A 433MHz RC unit for large scale model train locos (RFM12B)
    • Telemetry data transmission from stratosphere to ground control

My code collection on Github (Embedded C for AVR and STM32)

• • • https://github.com/DK7IH

Misc

• • Fake components – and how to recognize them