QRP EFHW antenna housing
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Antenna housing for 5W QRP EFHW transformer inspired by the K6ARK 5W EFHW transformer.
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- Printables
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- Electronics
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- Creative Commons — Attribution — Noncommercial
I designed this as a robust housing for the little K6ARK EFHW transformer. His design uses a proprietary PCB and tiny capacitor. My design allows for the use of larger through hole capacitors. It incorporates a panel mount SO-239 connector. It uses four M3X10mm screws and two M2.5X8mm screws to hold the housing together. It has a hole for attaching a cord or zip tie. This allows the use of a less fragile PL259 connector, and the pointy shape allows for less snagging in trees.
This housing will contain the capacitor and a ferrite toroid. Use a short copper plated steel antenna wire (22 gauge) and route it through the S-shaped channel inside the housing. I put some heat shrink tubing on the last centimeter or so for strain relief. This is adequate to prevent the wire from pulling out of the housing. It does not seem to introduce enough inductance to change the antenna characteristics.
I printed in Prusament PETG using supports on the build plate only. Print with the flat side down. Do not use materials containing carbon fiber as they might be conductive and affect performance. PETG is good for part time outdoor use but if you plan to install this in a permanent installation, I recommend ASA for better UV tolerance.