1. 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

2. Transmission Line Basics VE3KL Overview
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. Transmission Line CircuitV- 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. Approximate Measurement of Zo,VF RG 8X, Length = 3
Approximate Measurement of Zo,VF RG 8X, Length = 3.2 metres long Length must be << one wavelength
Zin ZL
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
Zin ZL
Zo, Velocity, Loss, Length

7. Transmission Line Measurements RG 8X, 3.2 metres
Aim 4170
VNA
Zin ZL
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