Sony UWP-V1, Руководство по обслуживанию

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2-27
UWP Series
2-3-2. Adjustments
This section describes the following adjustments (and
checks) required to satisfy the specifications.
Adjustment Item
1. Current Consumption Check
↓
2. Reference Frequency (4 MHz oscillation frequency)
Adjustment
↓
3. Output Level Adjustment
↓
4. RF Squelch Level/RF Indicator Level Adjustment
↓
5. Overall Characteristics Check
(1) Output Level Check
(2) S/N Check
(3) Frequency Characteristic Check
(4) Distortion Ratio Check
(5) RF Squelch Level/RF Indicator Check
(6) RF Level Indicator Check
(7) AF Level Indicator/AF Indicator Check
(8) Tone Squelch Check
n
0 dB u V
EMF
= _ 113 dBm
(EMF = Electromotive force)
0 dBm = 1 mW at 50
Z
loaded
Note on Adjustment
The RF level of the input signal (the output level of the sig-
nal generator) for adjustment is expressed as an open ended
voltage in unit dB
u V
EMF
(0 dB u V
EMF
= 1 u V
EMF
).
The adjustment is to be performed by calibrating the output
level of the signal generator as shown below.
Calibration method
1. Connect the RF millivoltmeter to the signal generator as
shown in the figure below.
2. Adjust the level of the output signal from the signal gen-
erator (SSG) so that the RF millivoltmeter reads 50 mV.
The level of the output signal from the signal generator
(SSG) when RF millivoltmeter reads 50 mV shall be
specified as 100 dB
u
V
EMF
(at no load).
Setting the Squelch OFF Mode
When the URX-M2 is installed in the MB-X6 or MB-806,
the squelch OFF mode can be set in the following proce-
dure.
1. Turn off the power of the MB-X6/MB-806 and install
the URX-M2.
2. While pressing the “SET ” and the “
_
” button of the
URX-M2 at the same time, turn on the power of the
MB-X6/MB-806. (Keep pressing the above buttons
and continue the adjustment.)
3. When the following message appears on the LCD of
the URX-M2, remove your hands from the above
buttons.
Model LCD message
U30 U30
U42
U42
CE62
CE62
CE67
CE67
KR HELLO
4. When the message “Sq OFF ” is displayed, the squelch
OFF mode is set.
n
When you turn off the power of the MB-X6/MB-806,
the equipment returns to the normal mode (squelch ON
mode).
V
Signal generator
(SSG)
RF millivoltmeter
(set in 100 mV range)
50 Z
termination probe
Adjust the output of
the signal generator
(SSG) so that the
meter reads 50 mV.
50 mV 50 Z
50 Z
OSC
100 dB u