Testing Am Or Fm Transmitters; Measuring Am Of Fm Transmitter Distortion - IFR FM/AM-1200A Operation Manual

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4-5-5 TESTING AM OR FM TRANSMITTERS
STEP PROCEDURE
/CAUTION\
MAXIMUM INPUT TO T/R CONNECTOR (11) MUST NOT
EXCEED 150 WATTS.
MAXIMUM TIME LIMITS FOR MEASUREMENT OF TRANS-
MITTER OUTPUT USING T/R CONNECTOR (11) IS:
>1SO W
=
1 MINUTE "ON", 5 MINUTES ''OFF".
+
50 W
=
MAXIMUM CONTINUOUS.
1. Perform "BASIC RECEIVER OPERATION" steps described in paragraph
4-S-2.
2 •
!NOTE!
Connect
son
coaxial cable between output of
transmitter under test and FM/AM-1200S/A T/R
Connector (11).
Position MODULATION Select Control (3) to:
a. AM "NORM'' or "NAR" position if testing AM transmitters.
h.
FM ''NAR'', ''MID" or ''WIDE'' position, if testing FM transmit-
ters.
3.
Use monitoring features outlined in Table 4-7 to monitor desired
signal parameters •
4-5-6 MEASURING AM OR FM TRANSMITTER DISTORTION
STEP PROCEDURE
------------------------------------------------------------------------
1. Perform ''BASIC RECEIVER OPERATION'' steps described in paragraph
4-S-2.
4-32
05
!NOTE\
Connect
son
coaxial cable between output of
transmitter under test and FM/AM-1200S/A T/R
Connector (11).