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Copy pathCOLLINEAR_915_9.7DBI_50OHMS.NEC
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COLLINEAR_915_9.7DBI_50OHMS.NEC
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CM LoRa/LoRaWAN tutorial 46
CM https://www.mobilefish.com/developer/lorawan/lorawan_quickguide_tutorial.html
CM https://www.mobilefish.com/download/lora/collinear2_868mhz_4nec2.nec.txt
CM Collinear antenna with 3 helixes and 4 radials
CM To be used in 4NEC2 with support for SY cards
CM Helix outer diameter diam = 29.6mm
CM Helix radius center hr = (diam-d) / 2 = 13.9mm
CM Helix wire diameter d = 1.8mm
CM Helix wire radius r = d/2 = 0.9mm
CM Number of turns n = 1
CM Spacing between turns spacing = 4.5mm
CM Wire length bottom wla = 174mm
CM Wire length middle wlb = 221mm
CM Wire length top wlc = 186mm
CM Wire length radials straight LA = 28mm
CM Wire length radials bend LB = 65mm
CM Bend angle = 40 degrees
CM Wire a,b,c has an x offset = 13.9mm
CM Four radials has an x offset = 13.9mm
CM Frequency freq = 868.0 MHz
CM feedpoint is located at the bottom of the bottom wire
CM -----
CM Helix bottom
CM Helix middle
CM Helix top
CM Wire bottom
CM Wire middle
CM Wire top
CM Radial X straight
CM Radial Y straight
CM Radial -X straight
CM Radial -Y straight
CM Radial X bend
CM Radial Y bend
CM Radial -X bend
CM Radial -Y bend
CM Radiator (copper)
CM Radials (stainless steel)
CE
SY freq=915
SY AH=0 'Antenna height in wavelength
SY G=0.019 'Ring gap 0.019 Adjust gap when testing
SY W=0.0040 'Wire thickness 0.0040
SY A=0.5810 'Center wire 0.5810 Adjust when testing
SY B=0.7122 'Inner wires 0.7122
SY C=B 'Outer wires 0.7122
SY D=B 'End wires 0.7122 Adjust when testing
SY R=0.040 'Ring radius 0.040 (1/4 of wavelength)
SY da=A
SY db=da+G
SY dc=db+B
SY dd=dc+G
SY de=dd+C
SY df=de+G
SY dg=df+D
GW 5 30 R 0 0 R 0 da W
GH 1 11 G G R R R R W
GM 0 0 0 0 0 0 0 da 1
GW 6 41 R 0 db R 0 dc W
GH 2 11 G G R R R R W
GM 0 0 0 0 0 0 0 dc 2
GW 7 33 R 0 dd R 0 de W
GH 3 11 G G R R R R W
GM 0 0 0 0 0 0 0 de 3
GW 8 30 R 0 df R 0 dg W
GW 10 30 -0.11 0 0 -0.11 0 dg W 'Reflector
GX 100 001
GM 0 0 0 0 0 0 0 AH
GS 0 0 299.80/freq
GE 0
GN -1
EK
EX 0 103 10 0 1 0 0
FR 0 0 0 0 freq 0
EN