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.......................................................................................5
DISCLAIMER
Information in this manual is designed for user purposes only and is not intended to supersede
information contained in customer regulations, technical manuals/documents, positional 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, 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.
© 2012 MFJ Enterprises, Inc.
ii
MFJ-222 Antenna Phase Meter Instruction Manual
Antenna Phase Meter
Phase Cal
-
+
Introduction
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. A built in internal load is featured to reduce the use of adapters and loads in
many cases. An easy to read LCD display is used for reading phase measurements to the degree and the
frequency to 1KHz.
Specifications
Phase meter
Frequency Range 1KHz to 55MHz
Phase Range -180 to 180 degrees
Frequency Counter 300KHz to 50MHz
Input Signal Level 1V to 3.5V with Internal Load
1V to 16V internal load off
Supply Voltage 8 to 16VDC External supply
9V Battery Internal supply
Front Panel
The front panel has only 2 main controls the
POWER and the INTERNAL LOAD push button
1 to 50MHz Digital Phase Shift Meter
switches. The LCD Display shows the Phase
from -180 to 180 degrees and the frequency of
the generator being used on the MFJ-222.
ON
OFF
POWER INTERNAL
50 OHM LOAD
There are 2 adjustment ports that once set are
not normally readjusted which are the Phase
Cal and the Display Contrast controls.
Display
Contrast
Phase -000 Deg
Freq 00.000 MHZ
MODEL MFJ-222
Top Panel
The top panel has the signal connections using BNC connectors and the power jack which is a 2.1MM
connector.
The GENERATOR IN is the input for the signal generator.
UNKNOWN
IN
REF
OUT
POWER
9-15VDC
GENERATOR
IN
The output should be at least 1V and no more than around
3.5V (250mW) if the internal 50 ohm load is used.
The REF OUT is the output to the device under test.
The UNKNOWN IN is from the output of the device under test
to the MFJ-222 Phase Meter.
© 2012 MFJ Enterprises, Inc. 1
Loading...