Ham portable balun unun choke box

T140 & T240 versions

Case for making a portable balun/unun matching transformer capable of 100w when made with the below components.

FT140-43 FAIR-RITE FERRITE CORE TOROID RING https://www.ebay.co.uk/itm/114198678549?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649

1.25mm enamel copper wire https://www.ebay.co.uk/itm/281724395117?ssPageName=STRK%3AMEBIDX%3AIT&var=580729423448&_trksid=p2060353.m2749.l2649

100pF 3kv Ceramic Capacitor https://www.ebay.co.uk/itm/284389639091?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649

50 Ohm BNC Panel Mount Socket, Square Flange 4 Four Hole Female https://www.ebay.co.uk/itm/153472277182?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649

T140 version uses m3 bolts, nuts and washers used to clamp antenna wire using m3 wing nuts with the t240 version using m4 hardware.

This is a work in progress though is perfectly usable in its current form but do feel free to message me if you have any changes you think would be useful.

FT240 options now available, including choke versions for both enamel wire and a wider version for RG58 coax.

Print Settings

Printer Brand:

Creality

Printer: Ender 5

Rafts:

No

Supports: Yes

Resolution:

0.2

Infill: 50

Filament: eSun PLA+ Black

Notes:

Designed in Fusion 360 printed with an Ender 7

Category: Hobby