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Summary of Contents for MFJ 222
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Page 2: Table Of Contents
MFJ-222 Antenna Phase Meter Instruction Manual Table of Contents Specifications ........................1 Front Panel........................1 Top Panel........................1 Setup..........................2 Power Source ............................2 Contrast ..............................2 Operation ........................2 Theory of Operation ......................3 Calibration ........................3 Schematic ........................4 FULL 12-MONTH WARRANTY.................. -
Page 3: Specifications
The MFJ-222 is an Antenna Phase Meter designed to measure network phase shifts. This could be for antenna phasing networks or any other network that you need to know the phase shift of. The MFJ-222 uses low power high speed devices giving it a large bandwidth for any HF or lower VHF network and long battery life for field use. -
Page 4: Setup
REF OUT and the UNKNOWN IN will be measured. Assuming that the device under test is expecting a 50 ohm load, turn on the internal load on the MFJ-222. If the device under test is not expecting a 50 ohm load then a BNC TEE should be connected to the UNKNOWN IN port and the device under test to one leg of the Tee and the expected load on the other side of the Tee. -
Page 5: Theory Of Operation
Theory of Operation The MFJ-222 takes the signal from the generator and sends it to the device to be tested. The signal is passed through the device and brought back in to the MFJ-222. A dual high speed low power comparator is used to square up the signal at the zero crossing point of the sine wave for both the REF OUT and UNKNOWN IN signals. -
Page 6: Schematic
MFJ-222 Antenna Phase Meter Instruction Manual Schematic © 2012 MFJ Enterprises, Inc. -
Page 7: Full 12-Month Warranty
MFJ Enterprises, Inc. warrants to the original owner of this product, if manufactured by MFJ Enterprises, Inc. and purchased from an authorized dealer or directly from MFJ Enterprises, Inc. to be free from defects in material and workmanship for a period of 12 months from date of purchase provided the following terms of this warranty are satisfied. - Page 8 MFJ-222 Antenna Phase Meter Instruction Manual © 2012 MFJ Enterprises, Inc.
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