Related Manuals for MFJ MFJ-9219
Summary of Contents for MFJ MFJ-9219
- Page 1 QRP Tuner, Wattmeter, & Dummy Load MFJ-9219 INSTRUCTION MANUAL ©2020 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
The MFJ-9219 ........ -
Page 4: Radio-Frequency Radiation
MFJ-9219 QRP Tuner, 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-9219
Weighing in at only 51 oz and measuring only 5 inches, the MFJ-9219 can slip into almost any pack and won’t be a burden down the trail. The MFJ-9219 will work out-of-the-box with the MFJ-9400 series of sideband transceivers, the VEC-1300 series, and for... -
Page 6: The Wheatstone Bridge
50Ω. This tells us that in the case of the MFJ-9219 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... -
Page 7: Relevant Schematics
(b) A Wheatstone Bridge Figure 4: Relevant Schematics is sufficiently large that I is negligible (reasonable for most meters and the MFJ-9219), V be written in terms of the source potential V and the resistances. This is shown in Equation 1. -
Page 8: Features
= 50Ω. FEATURES For such a small package, the MFJ-9219 is jammed-packed with features. The clear and readable multipurpose meter provides instant feedback regarding the status of your signal and antenna match. The compact and efficient T-network will match just about any load and has a bypass in the event it is not needed. -
Page 9: System Setup
Figure 6 shows a basic setup that utilizes the MFJ-9219. The necessary connections are simple: connect the RADIO port of the MFJ-9219 to your radio, and the ANTENNA port to your antenna. The MFJ-9219 does not use any external DC power, so once those connections are made the unit is ready to operate. -
Page 10: Thermal Warning
Step 8 Set the SWR/Wattmeter to bypass. THERMAL WARNING The resistor network in the MFJ-9218 is made up of eight 100Ω 2W surface-mount resistors. Six are used in SWR mode and all eight in Dummy Load and Power mode. Due to the small size of the devices the temperature increase is substantial. -
Page 11: 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 12 USER NOTES...
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