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4-6-6
VARIABLE GENERATE
This feature allows the generator to be moved off center frequency a
minimum of ±10 kHz and the EXT MOD Connector (15) to be used for DC
coupling.
STEP
PROCEDURE
1.
Set front panel controls to the positions listed in Table 4-6.
2.
(FM/AM-1200S only).
Position HORIZONTAL Sweep Selector Control
(26) to "10 kHz/Div'' and center display using HORIZ POS Control
( 3 0 ) •
3.
Rotate GEN/LOCK Control (32) out of the ''LOCK" (detent) position
and observe generator frequency change on FREQ ERROR Meter (36)
and analyzer display (FM/AM-1200S only).
4.
Place GEN/LOCK Control (32) to "LOCK'' (detent) and observe that
FREQ ERROR Meter (36) goes back to zero and analyzer display is
centered (FM/AM-1200S only).
4-6-7
MEASURING UUT RECEIVER SINAD SENSITIVITY
STEP
PROCEDURE
------------------------------------------------------------------------
1.
Connect 50n coaxial cable between FM/AM-1200S/A T/R Connector
(11) and RF input of receiver under test.
jNOTE]
For UUT SINAD measurements, the FM/AM-1200S/A
internal tone generator (fixed) should be used
as a modulation source.
A modulation frequency
of 1000.0 Hz is required.
2.
Connect audio output of receiver under test to EXT/MOD/SINAD
Connector (15) and place Modulation METER Control (4) to "SINAD"
position.
3.
Adjust RF Level Attenuator Control
(9)
for an output level of
5
00
11
v.
4.
Slowly decrease FM/AM-1200S/A RF output level until MODULATION
Meter (1) displays desired SINAD value.
[NOT~~
The setting of RF Level Attenuator Control
(9)
and RF Level Attenuator Vernier Control (10)
represents SINAD sensitivity of receiver under
test.
4-39
05
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