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3-2. Adjustments
This section describes the following adjustment ( and
checks ) required to satisfy the specifications.
Adjustment Item
3-2-1. TUN-8 Board Adjustment
1. Front-end Adjustment
2. 1st Local Adjustment
3. IF Adjustment
4. Muting Level and RF Level Adjustment
5. FM Detector Adjustment
6. Output Level Adjustment
7. S/N Check
8. Noise Squelch Check
9. Tone Squelch Check
3-2-2. Overall Characteristic Confirmation
1. Current Consumption Check
2. S/N Check
3. Frequency Caracteristic Check
4. Distortion Ratio Check
5. RF Input Level Indication Check
6. AF Indicator Check
n
0 dB µV
= _113 dBm
EMF
EMF: Electromotive force
0 dBm = 1 mW at 50 Z loaded
3-2
Note on Adjustment
The RF level of the input signal (the output level of the
signal generator) for adjustment is expressed as an open
ended voltage in unit dBµ (where 0 dBµ= 1 µV). The
adjustment is to be carried out by calibrating the output
level of the signal generator as shown below.
Calibration Method
(1) Connect the RF milivoltmeter to the signal generator
as shown in the figure below.
50 Z
termination probe
Signal generator
(SSG)
100 dBµ
50 Z
OSC
50 Z
(2) Adjust the level of the output signal from the signal
generator (SSG) so that the RF millivoltmeter reads 50
mV. The level of the output signal from the signal
generator (SSG) when the RF millivoltmeter reads 50
mV shall be specified as 100 dBµ (at no load).
RF millivoltmeter
(set in 100 mV renge)
Adjust the output of
the signal generator
(SSG) so that the
meter reads 50 mV.
V
50 mV
WRR-855B
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