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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. It forms a quarterwave coaxial impedance transformer
post 30 Sep 2024
Antenna Duplex duplexer Links →
2m/70cm Diplexer
The easiest way to set the filters up without a network analyser, is to connect a good 50 Ohm load to the antenna port and adjust the spacing between the turns of the coils to achieve a good VSWR
2m - 70cm diplexer
With this diplexer, you can connect a 2m (144-146 MHz) and 70cm (430-440 MHz) transmitter to a single dualband antenna, or a dualband transmitter to two seperate antennas
2m-70cm Duplexers-Diplexer
Onze 2 m band eindigt bij 146 MHz en de 70 cm band begint bij 430 MHz. Het midden ligt op 146 + 430 - 2 = 288 MHz
33 MHz diplexer
This is optional, but the diplexer should be mounted as close to the mixer's IF output as possible
1.3-400 / 150-460 MHz Duplexer Devresi Eklendi
50
The easiest way to set the filters up without a network analyser, is to connect a good 50 Ohm load to the antenna port and adjust the spacing between the turns of the coils to achieve a good VSWR
With this diplexer, you can connect a 2m (144-146 MHz) and 70cm (430-440 MHz) transmitter to a single dualband antenna, or a dualband transmitter to two seperate antennas
Onze 2 m band eindigt bij 146 MHz en de 70 cm band begint bij 430 MHz. Het midden ligt op 146 + 430 - 2 = 288 MHz
This is optional, but the diplexer should be mounted as close to the mixer's IF output as possible
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