3-6
WRT-847A/847B
3-2-5. Maximum Frequency Deviation
Adjustment
n
Be sure to perform this adjustment after “3-2-4. Reference
Frequency Deviation Adjustment” has been completed.
Equipment and Tools
DC power supply
DC output voltage:
+
3.0
±
0.1 V dc
DC ammeter
Audio analyzer
Modulation analyzer
Oscilloscope
RF adjusting cable (Part No. J-6402-390-A)
RF conversion connector (Part No. J-6402-490-A)
AF input cable (Part No. J-6407-010-A)
Adjustor (Part No.7-721-052-81)
Connections
Same as “3-2-4. Reference Frequency Division adjustment”.
Switch and Control Setting
First, Perform the same setting as described in “4. Switch and
Control Setting during Adjustment and Checking,” on page 3-
3, then perform the following setting:
RF power setting:“H” (= 50 mW)
Procedure
(1) Input 1 kHz,
_
18 dBV (
_
15.8 dBm) signal to the AF
input connector (CN301/MB-914 board) with AF input
cable.
(2) Connect the modulation analyzer to the antenna connec-
tor (CN402) with RF adjusting cable (and RF conver-
sion connector).
Set the modulation analyzer as below;
MEASUREMENT:
FM
MEASUREMENT RANGE: AUTO or
±
100 kHz
(manual operation)
HPF:
50 Hz
LPF:
15 kHz or 20 kHz
DE EMPHASIS:
50
u
s
(3) Adjust
1
RV303 so that the frequency deviation for the
modulation analyzer reading meets the following speci-
fication.
Specification: Frequency deviation = Maximum
Adjustment:
1
RV303/MB-914 board (B side)
(4) Input 1 kHz,
_
18 dBV (
_
15.8 dBm) signal to the AF
input connector (CN301/MB-914 board) with AF input
cable.
(5) Adjust
1
RV304 so that the frequency deviation for the
modulation analyzer reading meets the following speci-
fication.
Specification: Frequency deviation
=
±
36.0 kHz
±
0.2 kHz
Adjustment:
1
RV304/MB-914 board (B side)
n
The following adjustment is required only for the CE model.
(6) Adjust
1
RV303 so that the frequency deviation for the
modulation analyzer reading meets the following speci-
fication.
Specification: Frequency deviation
=
±
32.0 kHz
±
0.2 kHz
Adjustment:
1
RV303/MB-914 board (B side)
Содержание WRT-847A
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