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A Helix antenna for 2 metre satellite
Construction of the helix antenna is mechanically a little more difficult than a Yagi and requires a reflector behind it to function properly
post 03 Jul 2024
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Antenna elevator system for amateur satellites
The actuator is a cheap and heavy tool with high enough torque, ideal for elevation systems, but in practice it needs quite an effort in order to operate correctly in your homebrew antenna system
Antenna Turnstile per i satelliti Polari
due spezzoni di cavo 75 ohm la cui lunghezza deve differire esattamente di un quarto d'onda della frequenza di 136-137 MHz
Antenna quadrifilare per la ricezione dei satelliti meteo polari
L'antenna puo' venir corredata da due riflettori incrociati.E' consigliato un preamplificatore in prossimita' dell'antenna
A Portable Antenna for Mode B and J Satellites
In my case, I had been working SO-35 with a 1/2 wave on 70cm and a 1/4 or 5/8 wave on 2m. With these antennas and a little planning, it is possible to work this bird from a train
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The actuator is a cheap and heavy tool with high enough torque, ideal for elevation systems, but in practice it needs quite an effort in order to operate correctly in your homebrew antenna system
due spezzoni di cavo 75 ohm la cui lunghezza deve differire esattamente di un quarto d'onda della frequenza di 136-137 MHz
L'antenna puo' venir corredata da due riflettori incrociati.E' consigliato un preamplificatore in prossimita' dell'antenna
In my case, I had been working SO-35 with a 1/2 wave on 70cm and a 1/4 or 5/8 wave on 2m. With these antennas and a little planning, it is possible to work this bird from a train
Linear loaded short dipole 21Mhz For my amateur radio activities on the HF bands I only have a 3.6 m wide balcony available for antennas. After some study I decided to experiment with a shortened dipole for the 15 m band
Rx antennas 4Square Rx Vertical Array My frequency design of 1.825 MHz a 90 degrees line would be 33,70 metersinstead of the previously calculated 33,27 m
A simple SWR Meter is to be used at HF An SWR meter provides information about how well matched is your antenna with the transmitter and how well power is being radiated