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Fri. Dec 12th, 2025
Herbert Dingfelder – DL5NEG
Personal Homepage on Amateur Radio, RF Technology, Electronics and other technical stuff
About me
Amateur Radio Projects
My Thesis: A 144MHz FM/SSB receiver
A low-cost high-performance RF power sensor
Frequency counter up to 12GHz
A 3.5MHz Receiver for SSB and CW
Handheld RF Power Meters
2.3GHz to 432MHz RX converter
Microprocessor based frequency counter up to 70MHz
Universal Lab Bench Measurement Box
Generator for RF and waveform signals
7MHz QRP Transceiver
PLL tuner for 7MHz QRP Transceiver
2.3GHz to 432MHz RX converter
50MHz to 28MHz RX Converter
Double Quad Antenna for 1296 MHz
White Papers
RF Power Sensors
Other Homebrew Stuff
RC GPS and Voltage Sensor (Gaupner HoTT compatible)
RC voltage sensor (Graupner HoTT compatible)
GPS tracker for mini drones (10g weight)
Humidity and Temperature Measurement with ATtiny13A
Homemade Programmer for Atmel TPI Devices (ATtiny 4,5,9,10)
Wireless Heart Rate Sensor for RaspberryPi
Additional AVR microprocessor within WRT54GL
A bootloader for the ATmega8 AVR microprocessor
Universal serial PC interface
How to catch a mouse alive
Fuse bit blower for the Atmel AVR AT90S1200
Linux Tipps
Installing a LAMP/WordPress Webserver
Linux Toolchain for ATMEL ATtiny4 to ATtiny10
Photo Gallery
Pictures of Fireworks
My Trip throughout the US in 1998
Marathon Running
Marathon events to recommend
Amateur Radio Projects