An Amateur Radio Enthusiast from Brazil. JK De Marco. In these pages Hams will find his ideas on QRP, Antennas and Complete circuits.
PY2WM JK De Marco Projects
“One test result is worth a thousand expert opinions”. This has been attributed to a range of people, but most authoritatively to Wernher von Braun, the rocket scientist.
A 40 dB RF Attenuator -
"To measure power of a high power transmitter, or to be able to observe the output signal on an oscilloscope or spectrum analyzer, it is necessary that the signal is attenuated in accordance with the instrument, while it must be ensured that the transmitter is "seeing" the correct impedance. So it requires an attenuator that works with three ports (input, output, and output attenuated), all while maintaining the correct impedance of 50 ohms.
The circuit assembly and is shown here in EMRFD and also in the QST. When properly calibrated can be used for precision measurements in section 0-500 MHz, or a a calibration capacitor C1, can be used for the range of 0-50 MHz with reliability."
Other Projects and Ideas
- Simple Homebrew Coil Winding Machine
- Qrp-Br Spectrometer
- Simple ESR meter
- Swr Power Measuring mW To KW
- 5 Volts Reference Voltage Calibrator