RF Components & CircuitsVE3KL

Session 1

• Ferrite and Powdered Iron Toroids• Transformer, SWR Bridge, Low-Pass Filter

Ferrite SWR Bridge Kit

Kits and PartsFT50-43 4:1 Transformer

Ferrite

Low-Pass Filter… Powdered Iron Cores T50-6

Two T50-6 Toroids 9 and 8 Turns

9 Turns #248 Turns #24

Input Output

9 Turns 8 Turns

Circuit Board and BNC Connectors in Kit

Hardware Tools Required

Very Important

With new blades

• Plus a small vice, optical magnifier, laptop PC

60 Watts

Software Tools & Links : Free

• Filter Design Software Elsie:

http://tonnesoftware.com/elsie.html

• Zplots: (Optional: uses Excel) Can use VE3KL Software

http://www.ac6la.com/

• Kits and Parts for SWR Kit Manual and Data Sheets,

Download the Toroid Calculator (include VB6 Runtime)

Look under Toroids button

http://kitsandparts.com/index.php

Materials Selection

T50-6 Powdered Iron FT50-43 Ferrite

High Q Coils/Resonators

Band Pass Filters

Low Loss Transformers

Transmission Line Transformers

EMI Filters

T50-6

Powdered

Iron Core

Inductance Formula

• L = AL*N2/1000 uH

• N = nr. of Turns

• AL = 4 for T50-6 Iron Powder Core

• AL = 440 for FT50-43 Ferrite Core

• These numbers from Micrometals Data Sheet

Fair-Rite 43 Material

Micrometals Powdered Iron Cores

FT 50-43 & T50-6

• 8 Turns, 9 Inches: 9 Turns 10 Inches

• Measure L {Low Frequency with L/C Meter}

Ferrite Iron

• Make 1 ferrite coil (9 Turns) • Make 2 powdered iron coils (8T and 9T)

• Check Measurements against Formula• Record data for filter design

End of Session 1

Ferrite Iron

Clockwise