YU1AW PA HARMONIC FILTER

Coax cable: RG213, RG8, RG58 or similar with solid PE isolation (not foam isolation!).
Velocity factor v = 0.66 ; 
Impedance Zc = 50 Ohm ;
All conections MUST be as short as possible!
Filter is in metal box with cover to prevent radiations.
Insert filter between TX and antena, and improve your TX harmonics rejection. 
Harmonics rejection depends on coax cable Q-factor. 
Higher Q-factor (lower coax cable losses) gives higher harmonic rejection.
Fine tuning of coax cable lengths, with aid of wobler or network analyzer, 
is very welcome! 


Physical length of coax cable = length of outer conductor:


Filter for 6m band PA:
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L1 = 666 mm
L2 = 480 mm
L3 = 300 mm (2 pieces)


Filter for 4m band PA:
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L1 = 470 mm
L2 = 337 mm
L3 = 207 mm (2 pieces)


Filter for 2m band PA:
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L1 = 229 mm
L2 = 160 mm
L3 = 96 mm (2 pieces)


Filter for 135cm band PA:
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L1 = 146 mm
L2 = 100 mm
L3 = 56 mm (2 pieces)


Filter for 70cm band PA:
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L1 = 71 mm
L2 = 45.5 mm
L3 = 21.5 mm (2 pieces)



73, de YU1AW