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Diplex VHF UHF Separation of two bands
Here is a small assembly achievable in a short time and which allows to couple a VHF and UHF device on a dual-band antenna 144/432 via a single coaxial
post 29 Jan 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
RF Inductance Calculator Mean diameter of the air core coil, measured from conductor centre to conductor centre include the wire insulation thickness, if any
Voice Recorder Gestito dall'integrato in questione ed offre la possibilità di registrare più messaggi per una durata massima di un minuto con buona fedeltà di riproduzione