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R.F. CURRENT METER

This R.F. current meter was developed to assist in measuring line currents in balance feed lines as used in the All Band HF Antenna.


It is often useful to be able take measurements of RF current in the antenna system and the primary need that I had was to confirm the balanced RF current in each leg of the ladder line used on my multiband dipole.

A balanced antenna system requires that each half of the dipole including each side of the transmission line be a near mirror image and should also avoid nearby trees and structures in particular metallic structures. When the system is balanced the transmission line will have equal, but opposite current flowing in each line. This will cancel out any radiation or reception on the transmission line.

My test to confirm a balanced antenna system was to simple measure the RF current in each leg of the transmission line as it leaves the Z-match tuner. Accurate determination of the current while desired is not entirely necessary providing the measurement is consistent for each transmission line leg.

Front view of the R.F. current meter

Top view showing current selection switch

Internal view of the RF current meter

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Page last revised 10 October 2010 
 

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