Kit for "easily" building 4 lobe LHCP/RHCP 5.8GHz antennas for FPV.
Can be used both for VRx and VTx.
The template allows you to reproduce the antennas to create matching pairs for both VTx and VRx as well as creating spares that match your existing antennas.
How to use a similar template and build an antenna: https://youtu.be/8PKhqbBy2ls
Use the SPW58_Template.stl for best match with Circular Wireless SPW58 antennas.
Note: If you are just looking to save a few bucks on an antenna, this is probably not for you.
Print all items at 0.1 layer height, solid infill, ABS. Do not use PLA - it will melt when soldering. You can get away with printing the pingpong ball cutting tool with 15% infill.
To build an antenna you need:
Needle nose pliers
Hot glue gun
400mm 0.5mm copper wire (or 0.8mm MIG welding wire)
46.5 mm semi-rigid flexible RG402 0.141" RF coaxial cable
40mm ping-pong ball
SMA (or RP-SMA) Male Plug Solder For Semi-Rigid RG402 0.141" Cable RF Connector
25mm Ø6mm heat shrink
1) Use the bending template to cut the wire (6 pieces) to length and bend the wire at 90 degree angles using a set of pliers.
2) Then bend the wire to fit the template.
3) Now twist the loap 45 degrees left or right to create a LHCP or RHCP antenna.
4) Assemble the Four lobe alignment wheel with with the six lobe alignment wheel center.
5) Place the 4 lobes in the alignment wheel and secure them with a dap of hot glue.
7) cut 3mm of the insulation of the RG402 wire at each end, exposing the inner core.
8) Remove the sFour lobe alignment wheel center and place one end of the RG402inside the 6 pegs of the lobes.
9) Cut the heat shrink into 3 pieces: 10mm/10mm/5mm
10) place the 5mm piece of heat shrink over the 4 pegs of the lobes and carefully heat the heat shrink with the heat gun WITHOUT melting the hot glue (or ABS) - The pegs and RG402 are now somewhat secured.
11) Solder the pegs to the RG402 once again careful not to melt the hot glue or ABS.
12) Remove the 5mm piece of heat shrink with an exacto knife
13) place on 10mm piece of heat shrink around the 4 pegs and the RG402 and gently heat with the heat gun to shrink it into place
14) align the lobes with the 3mm stump of core and carefully solder them in place.
15) Using the cue tip, dap some isopropyl alcohol onto the hot glue and remove the hot glue once the isopropyl alcohol has done its magic.
16) Remove the antenna from the alignment wheel.
17) Place a 10mm piece of heat shrink on the RG402 as close to the loops as possible - do not shrink it!
18) Place the Six lobe dome base on the antenna.
19) Solder the SMA peg onto the RG402 core
20) solder the SMA connector onto the RG402 cable
21) Push the 10mm piece of heat shrink over the SMA connector base and heat to shrink into place.
22) Glue the six lobe dome base to the base of the antenna (heat shrink) to secure it to the antenna.
23) Place a ping-pong ball between the two halves of the ping-pong ball cutting tool (The "seem" of the ball should go opposite the cutting direction for easiest cut).
24) use the exacto knife to gradually cut though the ball
25) Place one half of the ball onto the Four lobe dome base and secure it with CA.