filter project
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Antennas : Quadrifilar Helix- NOAA Satellite Reception with QFH Antenna
- How to receive NOAA weather satellite with a home made QFH Antenna. This project includes some easy and efficient notch filters to suppress noise from FM frequencies
[ Hits: 257 | Votes: 1 | Rating: 8 ]
- Semi-automatic antenna tuner project
- Thsi article describes a microcontroller driven semi-automatic antenna tuner capable of handling power levels up to 150 watts. The device is a low pass filter tuner manually tuned by setting the optimized L/C combination by hand and then storing the values into the EEPROM of the mictrocontroller to recall them later (seperately for each band from 80 to 10 meters including WARC bands)
[ Hits: 291 | Votes: 0 | Rating: 0 ]
- Yaesu FT-950 and FT-2000 Roofing Filter Optimization
- Yaesu FT-950 and FT-2000 Roofing Filter Optimization and Improvement Project
[ Hits: 444 | Votes: 0 | Rating: 0 ]
- A600 Power Amplifier Project
- This is a power amplifier project for a RF 600W 1.8 MHz to 70 MHz linear amplifier including a Low Pass Filter. Projects includes schematics, pictures, PCD design, fans details, note on PA ferrite chokes and assembling instructions
[ Hits: 100 | Votes: 0 | Rating: 0 ]
- VHF-UHF Diplexer
- Diplexer is a passive device, a special filter circuit that seperates 2 different bands, not to be confused with the duplexer that usually separate 2 different frequencies on the same band.
[ Hits: 1135 | Votes: 2 | Rating: 5 ]
- Bandpass filter
- A simple project for an effective home made band pass filter, designed for the portable field day usage
[ Hits: 784 | Votes: 2 | Rating: 9 ]
- A compact 5 bands remote switchable BPF
- These band filters are based on 3 or 5 sections Butterworth band pass filters, maintaining 50 Ohm impedance, and when built around toroidal inductors, can be made very compact.
[ Hits: 221 | Votes: 0 | Rating: 0 ]
- PT40 7 MHz Transceiver by AA3SJ
- Home made 40 meter transceiver project. The receiver is a Progressive Receiver with a few modifications. The Transmitter is a modified MFJ Cub circuit. Includes schematic and circuit diagrams for Receive Input Filter, 3-Pole 500 Hz Cohn Filter and 7 MHz Double Tuned Bandpass Filter
[ Hits: 162 | Votes: 0 | Rating: 0 ]
- 17 meter QRP Transmitter
- 1-watt 17-meter cw transmitter that was originally done about 10 years ago as a club project for RAMS, the Radio Amateur Megacycle Society. It uses a VXO, rather novel at the time. It also uses a bandpass filter at the output rather than the usual lowpass
[ Hits: 122 | Votes: 0 | Rating: 0 ]
- Transverter for 50 70 28 MHz
- This multiband transverter project features power output at 13,8V 50MHz 15W, 70MHz 10W, second harmonic <65dBc. Single N connector of antenna, suitable for a dual band Yagi. Article include Block Diagram for Dual Transverter and low pass filters
[ Hits: 151 | Votes: 1 | Rating: 10 ]
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