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Summary of Contents for MFJ MFJ-842
- Page 1 Model MFJ-842 INSTRUCTION MANUAL CAUTION: Read All Instructions Before Operating Equipment MFJ ENTERPRISES, INC. 300 Industrial Park Road Starkville, MS 39759 USA Tel: 662-323-5869 Fax: 662-323-6551 COPYRIGHT 2006 MFJ ENTERPRISES, INC. VERSION 1A...
- Page 2 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:...
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Page 3: Specifications
Introduction The MFJ-842 Mobile VHF/UHF SWR/Wattmeter measures forward and reflected power and SWR simultaneously and is designed to operate on 140-525 MHz. The MFJ-842 has two power scales, which are selected with a push button switch. The high power scale measures 0-150 Watts forward power and 0- 50 Watts reflected power. - Page 4 MFJ-842 Mobile VHF/UHF SWR/Wattmeter Instruction Manual Operation 1. The meter’s full-scale forward and reflected power range is controlled by the POWER RANGE button. When the button is pushed in, the forward power scale is on 150 Watts and the reflected power scale is on 50 Watts. When the button is pushed out, the forward power scale is on 15 Watts and the reflected power scale is on 5 Watts.
- Page 5 MFJ-842 Mobile VHF/UHF SWR/Wattmeter Instruction Manual Calibration The MFJ-842 has been calibrated at the factory. If it should ever need to be recalibrated, then follow this procedure: Equipment Needed 1. Transmitter capable of supplying enough power to obtain ½ to full-scale reading at 140 or 525 MHz.
- Page 6 8. SWR requires no calibration. Read SWR directly from the crossing point of the forward and reflected needles. Transmitter/ Standard MFJ-842 50-Ohm Reference Mobile Transceiver Dummy Load Wattmeter SWR/ Wattmeter Figure 2: Test Setup HI REF HI FWD LO FWD LO REF Figure 3: Trim Pot Location (Bottom View of MFJ-842)
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Page 7: Technical Assistance
You can also send questions by mail to MFJ Enterprises, Inc., 300 Industrial Park Road, Starkville, MS 39759; by Facsimile (FAX) to 662-323-6551; or by email to techinfo@mfjenterprises.com. - Page 8 MFJ-842 Manual 300 Industrial Park Road Version 1A Starkville, MS 39759 Printed In U.S.A.
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