Hits
2m-70cm quadrifilar helical antennas
Build a pair of QHAs, one for 2 meter and one for 70 cm. A diplexer is of course needed to connect both to the single antenna connector of a dualband radio
post 11 Apr 2024
Helix Antennas Links →
Antenne helicoidale 2.4 GHz
2.4 GHz antenna design ideal for amateur satellite communications
Helix 2.425 GHz band
Broad bandwidth in the 2.425GHz band
circularly polarized antenna software
Software for calculator helix antenna
Detalles de diseo y construccion de una antena helicoidal
Here is a page with images of a 3-turn helicoid that was built for a reception system in the 1690 MHz band
34
2.4 GHz antenna design ideal for amateur satellite communications
Broad bandwidth in the 2.425GHz band
Software for calculator helix antenna
Here is a page with images of a 3-turn helicoid that was built for a reception system in the 1690 MHz band
PIC-Keyer This project describes the construction of a real "QRP" keyer with a small microcontroller PIC 16F84, with slightly modified hardware also PIC16F62
Qrm Eliminetor The principle is based on the fact that the interfering signal from the main antenna coming from the local interfering signal is phase-shifted by means of an auxiliary antenna so superimposed that eliminate the interference
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