In-Line" Power Measurements - Motorola R-2001D Operator's Manual

BASIC FM TRANSMITTER TESTS
POWER, FREQUENCY, AND DEVIAnON
4. Adjust the attenuator as in step A-3 above, to produce an adequate signal level to the Analyzer's Monitor receiver.
5. Adjust the transmitter and follow the same procedure outlined in steps A-5 through A-7 above, to measure fre-
quency and deviation.
6.
This same method may be used to verify frequency and deviation of a remotely located transmitter by reducing the
attenuator setting to fully realize the 1.5uV for lOdb SINAD sensitivity of the Analyzer's "of-the-air" monitor
function. To insure sufficient measurement accuracy however, make sure the Monitor receiver is fully quieted as
in step A-3 above.
C. "In-Line" Power Measurements
1. Referring
to
figure 4-8, connect the
RTL·4055B
in·line wattmeter adapter with the appropriate ~T-l200 series ele-
ment in the 50 ohm antenna line with the arrow pointing towards the antenna. Plug the adapter's cable into the
Analyzer's Ext Wattmeter jack. Refer to table 3-12 in this Manual for further description of elements.
2. Set DISPLAY to Ext Wattmeter, FUNCTION switch to Monitor FM, and the attenuator to -30 dB. In this step,
FUNCTION switch and attenuator do not function but should be set in case RF power is inadvertently applied to
the RF In/Out connector.
3. Use the keypad to select the scale that corresponds to the ST-1200 element in use.
4. Key the transmitter. Read forward and reflected power on the display.
4-16
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