Model TX-1202 User Manual
This wattmeter series offer many innovative features typically not found at this price level
• DC Grounded Antenna connector prevents electrostatic buildup.
• True Directional Coupler for increased accuracy over frequency.
• Low Bias Schottky Diode Detectors for increased linearity.
• Precision, large (104mm) Cross Needle Meter simultaneously displays
forward and reflected power with SWR.
• Individual Meter Scales for each power range increase reading accuracy.
• LED backlighting provides smooth, even illumination.
• Three Color Scale for improved readability.
• Rugged metal cabinet with speckled black finish and designer style
grey injection molded front panel aesthetically complements modern
• DC Power Cable Included.
Frequency Range
Center Calibrated
1.6 MHz - 1300 MHz
28.5/145 MHz
Power Scale
Maximum Power
Less than 0.1 dB
Min. Power (Forward)
Input/Output Impedance
Input/Output Connectors
Input power
Dimension (W/H/D)
Forward Power, Reversed Power, SWR, PEP
50 ohm
M type for HF/VHF Band, N type for UHF
9-14 VDC 200 mA (Max.)
184 x 118 x 131 m/m
1100 g
Weight (Net)
± 10% of Full Scale or better
Insertion loss
Testing Function
1260 MHz
0 - 200W
Power Range
435 MHz
1. Indicator Display : Indicates FWD/REV power in watts
and VSWR ratio
2. AVG/PEP (elliptical) push botton : Select AVG (out) or
PEP (depressed)
3. Frequency switch : Select frequency measured
4. Range switch : Selects RF power range multiplier
x1 x10 x100
5. LED ON/OFF button (elliptical) : Turn LED lamp
6. Zero adjust screws of analog cross needle meter
7. TX connector : Coax connector to transmitter 50 ohm RF output
8. ANT connector : Coax connector to 50 ohm antenna system
9. 13.8V DC connection (via power supply) : LED illumination
Note 1 : Watch out the LED wire must be correctly
connected, black/white to '+', Black to '-'.
Wrong connection burn LED)
Note 2 : DC power is only required to run the meter
backlight. This meter will function w/o DC power
in the AVG mode, even when switch off.
A. Set the RANGE switch to the proper meter multiplier
(X1, X10, X100) for the expected power level of the intended
B. In TX-1202, it corrosponds to 2/20/200 watts forward and
0.5/5/50 watts reflected full scale (Fwd : Ref = 4 : 1)
C. Select the frequency needed (HF/VHF/UHF amateur bands)
D. Set the radio transceiver to transmit mode and read the
scale corresponding to the RANGE selected
E. When switch to 'AVG', the meter reads average RF power.
When switch to 'PEP', the meter reads Peak Envelope
Power for use with SSB and AM transmissions. In this
mode, there will be a slow rise and decay time.
F. Push LED ON/OFF button when LED light is needed.
1. Since the meter movement is very sensitive, avoid excessive vibration or mechanical shock to the meter.
2. Watch the absolute maximum power could be applied to the meter by different models you bought.
3. The meter must never be reverse connected. Always observe the correct connections to transmitter and
antenna as indicated on the rear sockets.
4. Do not expose the meter to excessive temperatures, high humidity, or strong magnetic fields.
5. Contact your local dealer for service. Dealer information is in the back of user manual.
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