

QHA Quadrifilar Helix Antenna
La QHA nasce come antenna per RX dei satelliti polari NOAA, METEOR
post 21 Dec 2021

Helix Antennas Links →
Helix 435mhz uhf
It's actually 9.25 turns, including the quarter-turn impedance transformation to get a 50 ohm feed
Helix antenna design and construction details
Design frequency MHz, Number of turns, Turn spacing, wavelengths
Helix antenne
We decided to put it to the test and build a PVC helix for a 'too high' frequency. Then we wanted to redetermine the center frequency. 2430 MHz is approximately 67% of 3620 MHz. So that will be the design frequency that we give to HelixCalc
34
It's actually 9.25 turns, including the quarter-turn impedance transformation to get a 50 ohm feed
Design frequency MHz, Number of turns, Turn spacing, wavelengths
We decided to put it to the test and build a PVC helix for a 'too high' frequency. Then we wanted to redetermine the center frequency. 2430 MHz is approximately 67% of 3620 MHz. So that will be the design frequency that we give to HelixCalc
Antennas_manufacturers
About Rtty mode
Audio Recording
Amplifiers
Antennas Satellite
Amateur Television ATV
Aprs software
Beacon
Band Plan Ham Radio
Capitals Europe
DX cluster software
Italy provices
Italia-call-ham radio Italy provices Ham Radio Clubs Italy
EME Ham Radio Satellite
Grid Software
Ham shirts
Ham radio Magazine
Log Converter Software
Logs Search Services
Meteor scatter
Microwave
Mac Ham Radio Software
Practice with the soldering
Propagation Solar Cycle
Power Supply
PMR 466Mhz
Packet Radio TNC
PSK31 software
Prefix World
Propagation prediction
Qrp low power
QSL Printing
QRSS Amateur VLF operating
Radio old Museum
Radio portal
Surplus radio
Sstv Photo
SWL Shortwave DX Radio
Telegraph Morse code
VHF Activit
Web SDR