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extended double zep yagi antenna oct 2014 qst

Sep 21st 2014, 20:56

K7AZW

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
what frequency was this antenna designed for?
Sep 24th 2014, 20:42

W1VT

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
I've optimized this design for operation at 14.175 MHz.

The length of the driven element is 1046 inches of #18 silky wire (0.02” of 2.25 dielectric constant insulation).
The reflectors are 402.5 inches with a 241 inch gap. With a height of 47 feet, start with 489 inches open wire feeder (91% vf, 550 ohms).

If #14 THHN house wire is used, the driven element should be 1048 inches, and the reflectors 403.5 inches. Start with 485 inches of open wire and trim for best SWR.

For bare #14 copper wire, the driven element should be 1068 inches, and the reflectors 413.5 inches. Start with 486 inches of open wire and adjust for best SWR.

Zack Lau W1VT
ARRL Senior Lab Engineer

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