SWR Meter, Wattmeter, & Dummy Load
MFJ-9218
INSTRUCTION MANUAL
©
2020
MFJ Enterprises, Inc.
300 Industrial Park Rd. Starkville, MS 39759
P: (662) 323-5869F: (662) 323-6551
Page 1: ...SWR Meter Wattmeter Dummy Load MFJ 9218 INSTRUCTION MANUAL 2020 MFJ Enterprises Inc 300 Industrial Park Rd Starkville MS 39759 P 662 323 5869 F 662 323 6551...
Page 2: ...l handbooks or other official publications The copy of this manual provided to the customer will not be updated to reflect current data Customers using this manual should report errors or omissions re...
Page 3: ...CONNECTIONS 4 3 SYSTEM SETUP 5 4 SYSTEM OPERATION 5 4 1 THERMAL WARNING 5 5 TECHNICAL ASSISTANCE 6 List of Figures 1 Horizontally polarized Electromagnetic Plane Wave 1 2 The Electromagnetic Spectrum...
Page 4: ...erted into signal by the radio The term electromagnetic field refers to the electric and magnetic environment existing at some location due to a radiating source such as an antenna Figure 1 Horizontal...
Page 5: ...enerally defined as that part of the spectrum from about 3 kHz to 300 GHz Figure 2 The Electromagnetic Spectrum 2 THE MFJ 9218 2 1 INTRODUCTION The MFJ 9218 is a simple resistive QRP SWR Meter Wattmet...
Page 6: ...us that in the case of the MFJ 9218 and others like it any imbalance i e current flowing between points B and D will occur only if Rx 6 50 Assuming that the resistance of the ammeter is sufficiently l...
Page 7: ...ation 4 SWR Zx Z0 1 4 where in our case Z0 50 2 3 FEATURES 2 4 CONTROLS CONNECTIONS Figure 4 MFJ 9218 Controls 1 METER SET 2 INPUT 3 OUTPUT 4 TUNE BYPASS 5 SWR SET 6 Multifuntion Meter 1 METER SET Adj...
Page 8: ...ches the antenna in this mode so be sure to switch back to BYPASS when ready to operate d Above 5W limit the transmitter time to the time indicated in Figure 6 3 Power Measurements and Dummy Load a To...
Page 9: ...l MFJ Technical Service at 662 323 0549 or the MFJ Factory at 662 323 5869 You will be best helped if you have your unit manual and all information on your station handy so you can answer any question...
Page 10: ...USER NOTES...
