MFJ-249C Instruction Manual
HF/VHF SWR Analyzer
ii
TABLE OF CONTENTS
1.0
INTRODUCTION................................................................................................................................................. 1
1.1
A Quick Word about Accuracy.......................................................................................................... 1
1.2
Typical Uses ...................................................................................................................................... 2
1.3
Frequency Range ............................................................................................................................... 2
2.0
POWER SOURCES .............................................................................................................................................. 2
2.1
External Power Supply ...................................................................................................................... 2
2.2
Using Internal Batteries ..................................................................................................................... 3
2.3
Using Rechargeable “AA” Type Batteries......................................................................................... 3
2.4
Using Conventional “AA” Drycell Batteries ..................................................................................... 3
2.5
“Power Saving” Mode (sleep mode).................................................................................................. 4
3.0
MAIN MENU AND DISPLAY ............................................................................................................................ 4
3.1
General Connection Guidelines ......................................................................................................... 4
3.2
Power-up Display .............................................................................................................................. 4
3.3
Main MODE descriptions.................................................................................................................. 5
3.4
Blinking “VOLTAGE LOW” display warning ................................................................................. 6
4.0
MAIN (OR OPENING) MODE............................................................................................................................ 6
4.1
General Connection Guidelines ......................................................................................................... 6
5.0
ADJUSTING SIMPLE ANTENNAS ................................................................................................................... 7
5.1
Dipoles............................................................................................................................................... 7
5.2
Verticals ............................................................................................................................................. 7
5.3
Tuning a simple antenna .................................................................................................................... 7
6.0
TESTING AND TUNING STUBS AND TRANSMISSION LINES................................................................... 8
6.1
Testing Stubs...................................................................................................................................... 8
6.2
Velocity Factor of Transmission Lines.............................................................................................. 8
6.3
Impedance of Transmission Lines or Beverage antennas .................................................................. 9
6.4
Adjusting Tuners................................................................................................................................ 9
6.5
Adjusting Amplifier Matching Networks .......................................................................................... 9
6.6
Testing RF Transformers ................................................................................................................... 10
6.7
Testing Baluns ................................................................................................................................... 10
6.8
Measuring Inductance and Capacitance............................................................................................. 10
Measure Capacitance ...................................................................................................................................... 11
Measure Inductance ........................................................................................................................................ 11
6.9
Resonant Frequency of Tuned Circuits.............................................................................................. 11
Testing RF Chokes.......................................................................................................................................... 12
7.0
TECHNICAL ASSISTANCE ............................................................................................................................... 12
