Calculator for helix antennas

input form

parameter value and unit
frequency MHz
turns turns
VTX power mW
RX antenna gain dBi

output form

main parameters

parameter abbreviation value and unit
lambda λ m
antenna gain G dBi
max RX efficency RXeff %
min HPBW HPBWmin °
min FNBW FNBWmin °
max HPBW HPBWmax °
max FNBW FNBWmax °
HPBW HPBW °
FNBW FNBW °
axial ratio axratio -
effective apperture appeff mm2
min frequency Fmin MHz
max frequency Fmax MHz

construction parameters

parameter abbreviation value and unit
winding spacing swd cm
winding diameter Dwd mm
reflector diameter Dref mm
wire length l mm
wavetrap length lwt mm
wavetrap width swt mm
wavetrap effective apperture appeffwt mm2
wavetrap startpoint SPwt mm

extra parameters

parameter abbreviation value and unit
VTX gain Gvtx dBi
distance dist m

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