端部喂养半波连结型天线

End-Fed Half Wave Linked Antenna

2024-04-09 07:10:51

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Summary

Linked End-Fed Half Wave antenna for Amateur Radio. Consists of pre-tuned lengths of wire to operate on 10M, 12M, 15M, 17M, 20M and 40M Amateur Radio bands. I have used
two online calculators to estimate wire length and fine-tuned wires for each band using NanoVNA
https://k7mem.com/Ant_Element_Lengths.html
https://www.sota-antennas.com/efhw.php

Contains:
Enclosures for 49:1 or 64:1 autotransformer, build around 39mm ferrite core, Fair-Rite part number 2643251002
https://fair-rite.com/product/round-cable-emi-suppression-cores-2643251002/

Fits standard SO239 connector. I have used binding post to connect the antenna. I run it without counterpoise, but there is a place next to the SO239 connector to attach counterpoise wire. Antenna wires are connected using spade connectors, but automotive bullet connectors might be a better choice for better durability.

Enclosure lid with countersink screw holes, fits 8-32 x 1/2 inch long screws. Might also fit M4 screws.

Interlocking wire connectors with cable strain relief. I have used different link colors to color code different bands, 12 meters (Red), followed by 15M band (Orange), 17M (Yellow), and 20M (Green). Wire is AWG16 or 1.5 mm. 10M band uses same wire as the 20M band.

Loading coil end pieces, built to fit over 2" central vacuum pipe

Antenna_Link-Knob.stl is the only part that requires supports. The rest of the parts can be printed without support.

I have used this antenna for portable operation and POTA activations with great success, contacting DX stations.

端部喂养半波连结型天线

朋友，你觉得上面这个模型，属于下面的哪个分类？