Outdoor 100W antenna current balun box
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Wire dipole (1:1) or quad/deltaloop need center balun for connect coaxial cable. This box or current balun solved it.
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BOM
2x printed parts (both sides are the same), select the type according to the marking 1:1 or 1:4
1x - Ferrite BN-43-7051 with 2x three turns of twisted conductor/pair
1x - UHF Female (SO-239) 4-Hole Flange Panel Mount Coaxial Connector
1x - M3 x 10 mm, allen head
1x - M3 lock nut
2x - M4 x 25 mm, allen head
2x - M4 x 35 mm, allen head
6x - M4 lock nut
2x - M4 wing nut
1x - M3 cable eyelet
2x - M4 cable eyelet
60cm - of twin wires 0.5mm^2
How to assemble
wind three turn with twisted pairs of wire (or twisted enameled wire) into each hole of the two-hole core
screw the SO-239 connector into the plastic part with an M3 x 10mm screw and place an M3 cable eyelet under the lock nut (the hole in the second plastic part remains free for the drainage of condensed water)
on the bottom of the transformer connect both pairs in parallel and connect the two resulting ends to the SO-239 connector (center and M3 cable eyelet)
on the top of the transformer connect both windings in parallel for a 1:1 ratio (or in series for a 1:4 ratio) and connect M4 cable eyes to the two resulting ends
insert an M4 x 35 mm screw into the top hole in the plastic part and an M4 cable eyelet under the lock nut
the same procedure applies to the second plastic part
now put both plastic parts on top of each other (you can seal the joint with a small amount of silicone sealant before connecting, which will make the whole part tight) and secure the two protruding screws (each on a different side) with two lock nuts - two more wing nuts will come on them for connecting the dipole
then tighten the lower part with two M4 x 25 mm screws and secure with M4 lock nuts
the balun is hung by the central hole in the upper part and the outer holes are used for mechanical suspension of the dipole arms, so that the connection to the two output screws is not mechanically strained
do not forget to wrap/seal the PL connector with vulcanizing tape after connecting the coaxial cable
if the coaxial cable is long/heavy, it is advisable to fix it on a parallel cord from the central point, so that it does not rest on the PL connector with all its weight
Have fun!