Thingiverse
Ham Radio Multiband Ground Plane Antenna by ok1cdj
by Thingiverse
Last crawled date: 3 years ago
This is remix from http://www.thingiverse.com/thing:1725339
The idea is make 3 or 4 band lightweight portable vertical antenna.
The dimensions and simulations and measurements coming soon.
Work is in progress.
The holder is designed in Openscad and use cable ties.
CHANGE LOG
12.1.2017
Added simulation of 40,20,30m version with base loading coil.
13.1.2017
Added radial end insulator in STL and OpenSCAD
23.1.2017
Added reduction for BNC connector and cover when connector is not used
26.1.2017
Added knob for M6 nuts
07.2.2017
Coil inductance measurement
10.2.2017
Improved coil holder for better fit of cable ties
12.2.2017
Bottom fixing for fibre glass pole - 6m Decathon travel pole or cheap 6m pole Agepoch from Aliexpress.
pole guying part for top of pole - 5mm and 10mm diameter
26.2.2017
Field test of 40/30/20m version with VNA, 4.1 m lenght of vertical element, 5.25m radials
Antenna is really narrow on 40m as expected.
Plots from VNA.
24.4.2017
-wiring diagram
The idea is make 3 or 4 band lightweight portable vertical antenna.
The dimensions and simulations and measurements coming soon.
Work is in progress.
The holder is designed in Openscad and use cable ties.
CHANGE LOG
12.1.2017
Added simulation of 40,20,30m version with base loading coil.
13.1.2017
Added radial end insulator in STL and OpenSCAD
23.1.2017
Added reduction for BNC connector and cover when connector is not used
26.1.2017
Added knob for M6 nuts
07.2.2017
Coil inductance measurement
10.2.2017
Improved coil holder for better fit of cable ties
12.2.2017
Bottom fixing for fibre glass pole - 6m Decathon travel pole or cheap 6m pole Agepoch from Aliexpress.
pole guying part for top of pole - 5mm and 10mm diameter
26.2.2017
Field test of 40/30/20m version with VNA, 4.1 m lenght of vertical element, 5.25m radials
Antenna is really narrow on 40m as expected.
Plots from VNA.
24.4.2017
-wiring diagram
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