EFRW Matching Network, RF Choke, and Antenna Wire Winder
thingiverse
This is a combination matching network, RF choke, and antenna wire winder that is ideal for SOTA and POTA ham radio activations. Zip tie mounts are provided for an FT140-43 based toroidal 9:1 balun and a FT114-31 based RF choke to remove unwanted signal from traveling down the 50 ohm coax shield. The main antenna wire and a counterpoise wire can be wound on their respective sides of the winder. I also included two different insulators - one for a 41' antenna wire and the other for a 17' counterpoise. The insulators have a hole big enough for a carabiner and one small enough for the wire. A place for the BNC connection to the radio is also provided. I used 22 gauge wire to wind the cores and used #8 hardware for the antenna connections. A small diameter bungee cord can be installed in the hole shown such that it can stretch over the assembly and be locked in the slot on the other end of the assembly.
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