W6DKN Multiband  Dipole

G. Feeder impedance Z0 ohms          450               J.    Dipole length, feet                  90' 3"

D. Feeder wire diameter, mm              1.65            K.   Dipole wire diameter, mm        1.65

L.  Feeder length, feet                         40'               H.   Dipole height, meters               12.2    

V.  Feeder Velocity Factor                0.920            F.    Operating Freq. MHZ        28.800

Dipole electrical length        2.7200 waves               MHZ               Feedl       Rin     SWR50    Eff.      Meters

Dipole electrical height         1.170  waves               3.90                 12.2         14.8       6.3         75.9         80       

Dipole input resistance            411.6  ohms              7.26                 12.2         77.5      2.1          96.7         40

Dipole input reactance            846.4  ohms             14.30                12.2         40.5      2.5          90.6         20       

                                                                              18.13                12.2         79.9      2.7          95.5         17

Feeder electrical length        1.2720  waves             24.96                12.2         59.6      6.1          91.3         12

Feeder wire spacing                 48.6     mm.            28.80                12.2         88.5      5.7          94.7         10

Feeder input resistance            88.5   ohms

Feeder input  reactance         -125.6   ohms   

SWR v 50 ohms due to zin        5.73 to 1                   

VSWR on Feeder                    5.7 to 1

Power lost on feeder               3.8  % of Pin

Power lost in dipole + grnd    1.6  % of Pin

Overall efficiency                  94.7  percent

Equivalent overall loss            0.0 S-points

Materials:

Feeder line        Ladder line 450 ohms 14 gauge 40 feet

Dipole wire      12 gauge Hard Drawn copper stranded     

Dipole leg         45' 1.5" each

Ladder lock        1

Balun 1 to 1    1

SWR Measurements-No Tuner

Frequency MHZ                Meters                        SWR

7.225                           40                    1.5

14.285                         20                    1.4

18.150                         17                    1.5

24.930                         12                    2.0

29.600                         10                    1.5

51.500                         6                      1.1

          146.000                         2                      1.5

Note: 75 & 80 meters with tuner 96% efficiency

For more details please contact W6DKN.