Build an Endfed Halfwave Antenna with trap for 80m - Part I

Описание: In this video we build a slightly shorter 80/40/20/10 end-fed half wave antenna by using a "trap" or coil to add the 80m band. In the first part of the video series we shall see the 49:1 transformer construction and show the 110uH coil construction as well as discuss the overall antenna design.

*I do not take any credit for this design. It has been published numerous times in hundreds of HAM forums.

Part II of the series where we install and tune this antenna with a NanoVNA and make some design changes:    • Build an Endfed Halfwave Antenna with trap...  


73
"Dan" W6DKW


Schematic for 49:1 Transformer
https://f5npv.wordpress.com/wp-conten...
Note: The drawing gives credit to K1TA. And the source is from F5NPV.wordpress.com


PARTS LIST FOR TRANSFORMER

FT240-43 Toroid Ferrite Cores, QTY=2, https://www.amazon.com/dp/B07Y6NQRGF
16AWG Magnet Wire, https://www.amazon.com/dp/B07GBM6Y4Z
SO-239 Bulkhead RF Connector, https://www.amazon.com/dp/B089ZZZZDS
100pF 3KV Capacitor, https://www.amazon.com/dp/B08HZ21X8L
Various 1/4-20 hardware, two 1" bolts, ton of washers, some nuts.
4x4" Outdoor Plastic Box, https://www.amazon.com/dp/B01HCJDHUQ

PARTS LIST FOR 110uH COIL

3/4" or 19mm Lawn Sprinkler Riser (Home Depot), 6 Inch long
https://www.homedepot.com/p/Orbit-1-2...
20AWG Magnet Wire, https://www.amazon.com/dp/B07P2JFF5R
Kapton Tape - 1/2" wide. https://www.uline.com/Product/Detail/...
Heat shrink Tubing - 1" , https://www.amazon.com/dp/B07FPKVMTW

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