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HF-VHF Diplexer
One band I've been wanting to activate is 6 Meters, my first challenge was I didn't want to use a coax switch to flip between HF and VHF
post 29 Sep 2024
Antenna Duplex duplexer Links →
Duplexer 144-432 MHz
This self-constructing duplexer can be operated in just a few minutes with two 144/435 antennas
4-way Splitter/Combiner
Power splitters are used to combine 2 or more antennas on 1 feedline
HF VHF receiver diplexer
The design is relatively easy, a back to back low pass-high pass filer system with a 50 ohm impedance throughout
Stacking with homemade Power Splitters
The basis of the power splitters-combiners is a construction of a square tube for the outer conductor and a round tube for the inner conductor
Triplexer HF/50 Mhz 144 432 Mhz
To get signals from all directions, without having to constantly rotate the directional antennas
Duplexer 144 - 430 MHz
Low-pass filter 144 MHz and a high-pass filter 430 MHz of higher order
50
This self-constructing duplexer can be operated in just a few minutes with two 144/435 antennas
Power splitters are used to combine 2 or more antennas on 1 feedline
The design is relatively easy, a back to back low pass-high pass filer system with a 50 ohm impedance throughout
The basis of the power splitters-combiners is a construction of a square tube for the outer conductor and a round tube for the inner conductor
To get signals from all directions, without having to constantly rotate the directional antennas
Low-pass filter 144 MHz and a high-pass filter 430 MHz of higher order
PIC-Keyer This project describes the construction of a real "QRP" keyer with a small microcontroller PIC 16F84, with slightly modified hardware also PIC16F62