TKR-D710
62
ADJUSTMENT
Item
Condition
Measurement
Adjustment
Specifi cations / Remarks
Test-
equipment
Unit
Terminal
Unit
Parts
Method
24. Repeat
Gain adjust
[Analog
Wide]
FPU Test mode
1) Adjust Item: [Repeat Gain
(Analog Wide)]
Connect the Deviation Meter
to the TX ANT end via the ATT.
Deviation Meter setting
LPF: 15kHz
HPF: OFF
De-emphasis: OFF
2) Connect the SSG to the RX ANT.
SSG
setting
Frequency: Desired Frequency
Output: –53dBm (501µV)
MOD: 1.0kHz
DEV: ±1.0kHz
Deviation
meter
Oscilloscope
SSG
Rear
TX ANT
RX ANT
PC
ADJ
1.0kHz Deviation
±0.1kHz
Press [Apply] button to store
the adjustment value.
25. Repeat
Gain adjust
[Analog
Nar-
row]
FPU Test mode
1) Adjust Item: [Repeat Gain
(Analog Narrow)]
Connect the Deviation Meter
to the TX ANT end via the ATT.
Deviation Meter setting
LPF: 15kHz
HPF: OFF
De-emphasis: OFF
2) Connect the SSG to the RX ANT.
SSG
setting
Frequency: Desired Frequency
Output: –53dBm (501µV)
MOD: 1.0kHz
DEV: ±1.0kHz
Confi rmation and Alignment of Set-up to
Prevent Receiver Desensitization
1. Confi rmation of Duplexer alignment
The duplexer allows the Repeater to simultaneously transmit
and receive. To accomplish this, in the programmed receive fre-
quency, the transmit frequency must be notched or suppressed
by 75dB or more. Additionally, on the programmed transmit fre-
quency, the receive frequency must be notched or suppressed
by 75dB or more. The following figures are examples of Du-
plexer alignment using a spectrum analyzer.
Ref –10dBm
# Peak
Log
10dB/
Atten 5dB
V1 V2
V3 FC
AA
#Res BW 30kHz
VBW 30kHz
Span 20MHz
Sweep 50ms (401 pts)
RX
TX
75dB or more
2. Confi rmation of Repeater Desensitization
The following fi gure is a Test set-up for Repeater Desensiti-
zation.
After this Test set-up is completed, confirm the Repeater
Desensitization as mentioned below.
1) Disable the repeater mode.
2) Adjust the level of the RF generator until 12dB SINAD is
reached.
3) Increase the output of the RF generator by 1dB. (This in-
creases the SINAD.)
4) Enable the repeater mode.
5) Read the SINAD level. It should not drop below 12dB
SINAD. If the SINAD is less then 12dB, check the tightness
of the connectors and the tuning of duplexer.
50
Ω
dummy
RF signal
generator
Duplexer
Repeater
Attenuated
port
Summary of Contents for TKR-D710
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