Antennas

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Building and measuring baluns (Part II). Another approach 1 core instead of 2.

Return loss measurement: Left: FT 240-43 Right: FT140-43 Insertion loss measurement: The...

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Conversion tables

For people who are not used to work in dB. Loss compared to input signal. VSWR compared to Return Loss (dB

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How to measure the impedance of a transmission line?

If you have a transmission line (coax or open line) with an unknown impedance, I will explain here how to measure this. Above: far end of...

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Building and measuring baluns (Part I).

The 1: 4 Guanella current Balun with FT240 - 31 core. Material used: FT240-31 (outer diameter is 2.4 inch material = 31) Just Google...

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The use of stubs.

Every impedance can be matched with the use of two components. Capacitor or inductor. Dependent of the place you are on the smith...

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A practical example.

I have made a vertical antenna with a lengt of 10 meters and two radials of 10 meters also connected to the ground. This antenna...

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Antenne analysis and matching.

How to measure antenna impedance? Different types of VNA can be used. When using a professional VNA (Agilent, R/S,…) the measuring cable...