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Transmission Line Basics VE3KL Session 1 Getting Started

Transmission Line Basics VE3KL Session 1 Getting Started. Project Overview Measure Zo, VF at Low Frequency First Look at TLDetails….it does the math Measure a 3.2 metre cable with various loads. Keep a note book..data used later Applies to all sessions.

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Transmission Line Basics VE3KL Session 1 Getting Started

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  1. Transmission Line BasicsVE3KLSession 1 Getting Started Project Overview Measure Zo, VF at Low Frequency First Look at TLDetails….it does the math Measure a 3.2 metre cable with various loads Keep a note book..data used later Applies to all sessions

  2. Transmission Line BasicsVE3KLOverview Study a 3.2 metre section of Rg-8X Use TLDetails..Does the Math for us Measure a 3.2 metre cable with various loads Design, build and test a simple antenna tuner Design, build and test a 4:1 transmission line Balun Design, build and test a two stub isolation filter

  3. V- Transmission Line Circuit V+ Zo, Velocity, Length L = Inductance per metre [H] C = Capacitance per metre [F]

  4. Example Zo, Velocity, VF, Length L = Inductance per metre [H] C = Capacitance per metre [F] RG213 L = 255 nH/metre C = 101 pF/m Zo = 50.2 Ohms Velocity = 1.97E8 metres/s VF = Velocity/(speed of light) = 0.65

  5. ApproximateMeasurement of Zo,VFRG 8X, Length = 3.2 metres longLength must be << one wavelength ZL Zin Zo, Velocity, Loss, Length • Set ZL to an open circuit: Measure C at input • Set ZL to a short circuit: Measure L at input Use an LC meter (Low frequency) Calculate Zo and VF from the formulas Record results in a notebook or computer

  6. First Look at TLDetails ZL Zin Zo, Velocity, Loss, Length

  7. Transmission Line MeasurementsRG 8X, 3.2 metres Aim 4170 VNA ZL Zin Zo, Velocity, Loss, Length ZL = 0 Find frequency where Zin = j50 (50 Ohm Inductance) ZL = ∞ Find frequency where Zin = -j50 (50 Ohm Capacitance) Check with TL Details http://en.wikipedia.org/wiki/Telegrapher%27s_equations

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