Originally posted by YSWG
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There are two parameters to be found by trial & error, detailed below.
(1) Value of Capacitor
Try using lower value of capacitor, say 1.5 pF. If you dont have 1.5 pF, put 2 capacitors of 2.7 pf in series, and it will give you 2.7/2 = 1.35 pF
(2) Distance from antenna at which Capacitor should be inserted.
Try reducing & increaing the distance of splitter from antenna, 1 cm at a time.
Point of insertion along coax should be:
n x L + 0.85 x L,
where L = ½ wavelength in air (138 mm) x VF of coax,
and n can be any whole number 0, 1, 2, 3, ..., 10, .... etc, but n being smaller, the results are better.
So if n is selected to be 0, distance should be 0.85 x L, i.e. slightly less than ½ half wavelength.
The factor 0.85 above is rule of thumb, best value to be found by trial & error.
.....but decreased by 40% thanks to rainwater getting into the two-way splitter.
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