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A triplexer for shortwave 2 m and 70 cm


I used CuAg wire for the coils, normal Cu wire should work too. The capacitors are 500 Volt types
post 10 Apr 2024
A triplexer for shortwave 2 m and 70 cm

Antenna Duplex duplexer Links

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Six-Meter Heliax Duplexer/Repeater Project
Consists of discarded pieces of 1-5/8" Andrews Heliax that are cut to resonate at quarter wavelength of the notch frequency

The duplexer
This is a very nice project, especially for those Icom 706 that have an HF / 6m antenna connector as well as a VHF UHF connector

Duplexer per la banda 144/430 MHz
Lo stadio VHF e' un filtro di Chebishev Passa Basso a 5 elementi con un'attenuazione di circa 50dB/ottava al di fuori della banda passante

33 MHz diplexer
Ahead of the IF amplifier on the 2nd mixer's IF output is a circuit called a diplexer

Make yourself a Diplexer
Here's a simple way to do it automatically, with very low loss, and so you can transmit, listen or scan at will


23cm Yagi Antenna building

23cm Yagi Antenna building Finished antenna at 1275 MHz SWR under 1:1.5 at resonant frequency

50 MHz preamp Gain 26dB with the BFG135

50 MHz preamp Gain 26dB with the BFG135 Preamps for 144 and 430 MHz, for 50 MHz, the BFG135a is a cheap transistor and in my view rather strong. It is not easily damaged by static discharge or RF power. FG connection

interface-for-digital-broadcasts-with-integrated-audio

Interface-for-digital-broadcasts-with-integrated-audio 4-port HUB, with a TUSB2046. With port 1 of the HUB we drive the FT232RL; with port 2 the PCM2904, furthermore, we decided to leave ports 3 and 4 free