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Procedure
Step 1: S/N check
Perform the " 2. S/N Check " of Section 3-2-2. Overall
Characteristics Check.
When checking the S/N at 0 dBuV
note the ANNTENA A or B IN connector which shows the
better S/N.
Step 2: Adjustment
(1) Connect the signal generator to the ANTENNA A (or
B) IN connector which showed the better S/N at the
input of 0 dBuV
( = _113 dBm) under "Step 1.
EMF
S/N check".
Set the signal generator as follows;
(2) Connect the oscilloscope to the wire (TP201 terminal)
as shown below.
RV205
Tuner unit
(Upper side)
(3) Signal generator setting
FREQUENCY(carrier frequency)
U64 model; 776.125 MHz
U66 model; 788.125 MHz
U68 model; 800.125 MHz
RF OUTPUT (Output level): 0 dBuV
MODULATION (Moduation frequency): 1 kHz
DEVIATION (Frequency deviation): ± 5 kHz
(4) Adjust the RF OUTPUT (Output level) of the signal
generator so that Signal to Noise ratio is 34 dB ± 5 dB
( S/N; 34 dB ± 5 dB) under the " Step 1. S/N check ".
(5) Turn 1RV205(tuner unit) slowly counterclockwise to
be the DC voltage of the TP201 (NOISE) terminal
(land) change "L" (about 0 V).
(6) Adjustment
Specification: DC voltage of the TP201 (NOISE)
terminal(land) change from "L"(about
0 V) to "H"(about 4.8 V) level.
Adjustment: 1RV205/RF-92 board (tuner unit)
Turn 1RV205 slowly clockwise for
adjustment.
WRR-802A (U)
( = _113 dBm) ,
EMF
Oscilloscope
DC range setting
EMF
(= _113 dBm)
Step 3.
After completing adjustment, turn off the WRR-802A
power switch and perform the followings.
(1) Remove the tuner unit from the WR-802A.
(2) Remove the lower side case lid from the tuner unit,
and unsolder the wire ( 80 mm long) from the TP201
(NOISE) terminal (land).
(3) Attach the upper and lower side case lids to the tuner
unit, and insert the tuner unit to the slot of the WRR-
802A.
3-7
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