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4-13.
EXT WATTMETER.
When the analyzer DISPLAY is set to the Ext Wattmeter mode and the Motorola
RTL-4055A in-line wattmeter adapter (supplied) is connected to the Ext Wattmeter jack the analyzer measures
both forward and reflected power. The power rating of the wattmeter elements (Motorola ST-1200 series*), to
be used, are displayed on the CRT. The following is an example of a test setup for external wattmeter
operation. Figure 4-7 shows the test set connections and CRT display.
a.
Select the EXT Wattmeter function by means of the arrow keys located below the DISPLAY column.
b.
Plug the connector of the RTL-4055A In-Line Wattmeter adaptor into the "Ext-Wattmeter" jack located
on the RF SECTION of the front panel.
c.
Using the keyboard: enter the single digit which corresponds to the full scale power rating of the ST-
1200 series element you plan to use.
d.
Place the ST -1200 element in the In-Line Wattmeter adaptor and install element/adaptor assembly into
transmission line.
NOTE
Arrow on In-Line Wattmeter Adaptor must point in the forward direction of the
desired rf power flow through the adaptor.
e.
Key transmitter and observe magnitudes of forward and reflected power as displayed simultaneously
on the 2 analog meter bars and corresponding digital readouts.
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Figure 4-7.
Wattmeter Test Setup and CRT Display
REFLECTED POWER
READING
4-14.
SIMULTANEOUS GENERATE AND MEASUREMENT OPERATIONS.
The following test setups and
CRT displays are examples of simultaneous generating and measurement operations.
a.
FM Mobile radio setup for receiver sensitivity using Generator and SINAD meter.
1.
Connect RF In/Out to mobile radio antenna connector and multipurpose measurement (SINAD)
input to receiver audio output.
• Contact your Motorola Parts Source for ordering separately.
4-17
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