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Attenuatore ad impedenza costante
L'attenuatore ad impedenza costante e' un accessorio che risulta particolarmente utile ogni volta che si abbia la necessita' di interporre in una linea di trasmissione una attenuazione nota e regolabile del segnale
post 13 Apr 2024
Antennas Receiving Links →
Rx antennas building and testing the Waller Flag
DHDL transformer feed matching from 7:2 turns for 900/75 ohms ratio to 6:2 turns for 900/100 ohms ratio on the binocular BN73-202
Rx antennas the TX3A DHDL
Boom length m. 5.24-fiberglass spreaders m. 2.95-loops dimensions m. 2.00 x 4.27 with 5.00 m. separation-load resistors with1 watt OY series-parallel: 590 ohm on the front loop and 607 ohm on the back loop-transformers impedance ratio 600/100 ohm 5 by 2 turns on binocular BN73-202
SRC Front-end HF Filter
Il presente circuito permette di commutare automaticamente, ad ogni cambio banda del transceiver, l'opportuna antenna
SWL Receiving Antenna Experiments
I have been experimenting with a half wavelength end-fed wire for use as a portable 40M band
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DHDL transformer feed matching from 7:2 turns for 900/75 ohms ratio to 6:2 turns for 900/100 ohms ratio on the binocular BN73-202
Boom length m. 5.24-fiberglass spreaders m. 2.95-loops dimensions m. 2.00 x 4.27 with 5.00 m. separation-load resistors with1 watt OY series-parallel: 590 ohm on the front loop and 607 ohm on the back loop-transformers impedance ratio 600/100 ohm 5 by 2 turns on binocular BN73-202
Il presente circuito permette di commutare automaticamente, ad ogni cambio banda del transceiver, l'opportuna antenna
I have been experimenting with a half wavelength end-fed wire for use as a portable 40M band
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