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8. Receiver sensitivity adjustment
Preparation: Set the speaker audio output level to 50mW.
Operation: There are three points to be adjusted, the lower, central, and upper edges of
the receiver's covering range. Set the memory channels accordingly. Input an
RF signal from the SSG to the antenna connector then measure output signal
at the speaker jack using a SINAD meter. Press "F"(FUNC) key on the unit.
One of digits 00-FF should appear on the display where memory channel
number was shown. Rotate the dial on the unit to bring the SINAD value to
12dB or better.
a. Lower edge
Condition:(1). Memory Channel: 11
b. Center range
Condition:(1). Memory Channel: 12
a. Upper edge
Condition:(1). Memory Channel: 13
Necessary instruments:(1). Audio volmeter
Note:
Press "FUNC" key or leave the unit for 5 seconds to enter the new values and go to the
next adjustment procedure. Memory number should appear on the display when the unit
exits the sensitivity adjustment.
(2). SSG setting
Frequency: 137.000MHz
RF Output Level: -7.0dBμ
Modulation Frequency:1kHz
Modulation Level:3.0kHz (T, E, TFH)/ 1.5KHz (EUK)
(2). SSG setting
Frequency: 150.000MHz
RF Output Level: -8.0dBμ
Modulation Frequency:1kHz
Modulation Level:3.0kHz (T, E, TFH)/ 1.5KHz (EUK)
(2). SSG setting
Frequency: 173.000MHz
RF Output Level: -8.0dBμ
Modulation Frequency:1kHz
Modulation Level:3.0kHz (T, E, TFH)/ 1.5KHz (EUK)
(2). SSG
(3). SINAD Meter
(4). Audio dummy load
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