Hi Chuck,
Here is the YO file for my 20M 5 element Yagi on a 48 foot boom. I have
five of these antennas and they work great! This is a compromise design
for CW and SSB, with good gain, F/B and VSWR across the entire band. I'll
send the YO file for my 6 element 15M Yagi separately.
73!
Frank
W3LPL
donovanf@sgate.com
Yo file follows:
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W3LPL 5 Element 20M Yagi 48 Ft Boom
Height 2340.000
14.000 14.250 14.350 MHz
5 elements, inches
1.2500 1.1250 1.0000 0.8750 0.7500
0.0000 33.7500 50.2500 33.0000 33.0000 67.0000
86.0000 33.7500 50.2500 33.0000 33.0000 53.5000
171.0000 22.0000 47.8750 33.0000 33.0000 63.5000
349.0000 22.0000 31.2500 33.0000 33.0000 77.0000
570.0000 22.0000 43.7500 33.0000 33.0000 52.0000
Use the M and Tab keys to enter the following
T-match parameters:
Rod diameter: 0.5"
Rod Spacing: 6"
Rod Length: 48"
Lead Length: 3"
Series Cap: 99999 pf
Feed Z 200 ohms
Experience indicates that the driven element
tip must be lengthened to 62 inches, the
length that produces a modelled impedance of
+j20 ohms at 14.200 MHz
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On Tue, 18 Feb 1997, C. Logan Dietz (KE5FI) wrote:
> I am struggling with a design for a 20 meter yagi on a 45 foot boom.
> Nothing I try with YO seems to "look good" to me. I thought that if I
> started with a proven file I might arrive at better results.
> What kind of gain does YO show for your 5 el 20 on the 48' boom?
> Chuck, KE5FI
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