Related Manuals for MFJ MFJ-9218
Summary of Contents for MFJ MFJ-9218
- 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 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, recommendations for improvements, or other comments to MFJ Enterprises, 300 Industrial Park Road, Starkville, MS 39759. Phone: (662) 323-5869 Fax: (662) 323-6551 Business hours: M-F 8:00 AM - 4:30 PM CST.
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Page 3: Table Of Contents
Relevant Schematics ........MFJ-9218 Controls ........ -
Page 4: Radio-Frequency Radiation
MFJ-9218 SWR Meter, Wattmeter, & Dummy Load Instruction & Technical Manual RADIO-FREQUENCY RADIATION Radio-frequency (RF) radiation is one type of electromagnetic radiation. Electromagnetic waves and associated phenomena are discussed in terms of energy, radiation, and fields. Electromagnetic radiation is defined as waves in electric and magnetic fields moving together, or radiating, through space (Figure 1). -
Page 5: The Mfj-9218
Knowledge or understanding of it is not required to operate and enjoy the MFJ-9218. The circuit used in the MFJ-9218 is known as a Wheatstone bridge and is shown in Figure 3a. The Wheatstone bridge is a simple circuit that was originally designed to determine an unknown... -
Page 6: Relevant Schematics
50Ω. This tells 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 R = 50Ω. Assuming that the resistance of the ammeter is sufficiently large that I... -
Page 7: Features
Z = 50Ω. FEATURES 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: Adjusts the sensitivity of the multipurpose meter 2. RADIO: Connect to the radio 3. -
Page 8: System Setup
Figure 5 shows a basic setup that utilizes the MFJ-9218. The necessary connections are simple: connect the RADIO port of the MFJ-9218 to your radio, and the ANTENNA port to your antenna. The MFJ-9218 does not use any external DC power, so once those connections are made the unit is ready to operate. -
Page 9: Technical Assistance
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 questions the technicians may ask. - Page 10 USER NOTES...
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