YO File for W3LPL's 5 Element 20M Yagis

[Frank Donovan]

This e-mail contains the YO file for the 5 element 20M Yagi on a 48 foot
boom at W3LPL.  Five of these antennas have been in use for the last
several years at 50, 100 and 200 feet; operated individually and in
stacked pairs.

This design provides an excellent compromise between gain, front/back
ratio and VSWR across the entire band while avoiding a low feedpoint
impedance often found in other designs.

73
Frank
W3LPL
donovanf@sgate.com

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W3LPL 5 Element 20M Yagi 48 Ft Boom (as built)
Height 2340.000
14.000 14.200 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   52.0000 
171.0000   22.0000   47.8750   33.0000   33.0000   64.0000 
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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