Index :
My collection of old radio's :
Old RadiosDVB-T Antenna :
DVB-T 550 MHz Fractal AntennaSDR Software :
SDR RTL Spectrum Analyzer SoftwareBefore you go into SDR :
SDR: you should know this (external link)SDR interference and solutions
READ THIS FIRST: SDR Antenna Considerations
Antenna's for SDR:
SDR: Two Modified Stock Antenna's (indoor)SDR: PA0FBK VHF/UHF (Dualband 2m-70cm) Antenna
SDR: Wide-Band VHF-UHF Antenna DR2000 (test)
SDR Mini-Whip antenna's :
HF Mini-Whip Basic Antenna and de-noising (2022)
HF Mini-Whip non-smd small Antenna v1.1
HF Mini-Whip improved smd Antenna v1.2
HF Mini-Whip smd improved small Antenna v1.3
Other SDR Antenna's:
End-Fet Antenna for the HF Bands ( New )
Double Magnetic Loop Antenna for the HF Bands ( New )
SDR HF Up-converters (0-30 MHz) :
RTL-SDR Basic HF UP-Converter V1.0RTL-SDR Mini HF UP-Convertor V3.0
RTL-SDR USB HF UP-Convertor V5.0 ( New )
Other Projects :
DDS Generator 1-60 MHz for cheap AD9850 ModuleMaking the OZ2CPL HF Power meter
Make your own coils for VHF-UHF
Digital Zener Diode Tester 0 - 30 Volt ( New )
Kruidvat Radio and a DRM Mixer
Kruidvat Radio + Tune LED
Gel battery charger with anti-sulphation
Simple 1-30 MHz Generator with a LTC1799
The on1bes Toko Coil & Watch Crystal Tester ( Updated )
LC Meters :
Improved L and C Meter with PIC16F628 (Update 2021)Elektor Pico-C / frequency and period meter
LABO :
Calculate you antenna lenghtCalculate undefined SMD Coils in nH
Measure with a Varicap adapter
Testing Zeners
FET Specials :
Two FET TestersFET Oscillators
FET HF opamps
Microcontroller : Atmel & AVR :
AT89C2051 TestboardAT89C2051 Programmer (obsolete)
AVR ATTiny 2313 Test Board
AT89C2051 IR Decoder with Relais
Microcontroller PIC µP Pages :
PIC µP controller familiesModified Serial PIC µP JDM Progammer
My first computer was a Tandy TRS-80 anno 1980 !
Real Photo