The W8IO
Antenna Site - Download Page
(1 Aug 2023)
My
current software (zipped files)
144
MHz long Yagi NEC files
- WB0DGF/Hy-Gain-215DX
a 16.35 dBi, high G/T Yagi for 144.1 MHz on a 27.5 foot boom (metric
dimensions)
- G0KSC-144-13LFA
a 16.1 dBi, high G/T Yagi for 144.1 MHz on a 26 foot boom (metric)
- G0KSC-144-14LFA
a 16.55 dBi, high G/T Yagi for 144.1 MHz on a 29 foot boom (metric)
- G0KSC-144-15LFA
a 16.83 dBi, high G/T Yagi for 144.1 MHz on a 32 foot boom (metric)
- DK7ZB-144-12
a
16.5 dBi, high G/T Yagi for 144.1 MHz on a 26 foot boom (metric)
- DG7YBN
GTV2-14w a
16.3 dBi, high G/T Yagi for 144.1 MHz on a 27.2 foot boom (metric)
- BVO-4WL-144-15
a
16.4 dBi, high G/T Yagi for 144.1 MHz on a 27.2 foot boom (metric)
- YU7EF-EF0213
a
16.22 dBi, high G/T Yagi for 144.1 MHz on a 26.7 foot boom (metric)
- YU7EF-EF0215
a 17.0 dBi, high G/T Yagi for 144.1 MHz on a 33 foot boom (metric)
- SM5BSZ-2SA13
a 16.6 dBi, high G/T Yagi for 144.1 MHz on a 27.4 foot boom
(metric)
- M2-2M5WL a 16.94 dBi, high G/T Yagi for 144.1 MHz on a 33 foot boom (inches)
- K1FO-FO15-144
a 15.97 dBi, high G/T Yagi for 144.1 MHz on a 24.8 foot boom (metric)
- K1FO-FO16-144
a 16.33 dBi, high G/T Yagi for 144.1 MHz on a 27.4 foot boom (metric)
The VHF antennas shown above include the "raw" element lengths.
That
is, the element lengths are those used with a wood or plastic
(dielectric)
boom or supported above or below a metal boom with an large insulator.
To
convert these raw lengths into actual lengths used when passed through
the
center of metal booms, you need to add a correction factor, based on
whether
the element is insulated and passes through the center of a metal boom,
or
is shorted directly to the metal boom with a clamp. If the
element is insulated when it passes through the metal boom, the
correction
factor is approximately
1/4 the diameter of the boom. For
example,
for a 36" (raw length) insulated element passed through the center of a
1"
metal boom, the correction factor is 0.25", so the actual length should
be
36.25" when built.
Comments
are welcome!
contact
Roger: email to
rgcox2
(at) gmail.com
Roger Cox - Spring Lake, MI