Kenwood KCH-16 Service Manual page 35

BER (Bit Error Rate) Measurement
1. The Panel Test Mode is used to measure the BER (Refer
to "Test mode operation features" described on page
29.).
2. Select "20" for test signaling (Refer to "Test Signaling"
described on page 30.).
When "20" is selected for the test signaling, the fi lter is
automatically selected to "P25".
(If there is no RF input signal, the display shows
"500000")
3. Select a fi lter (Refer to "Filter Mode" described on page
30.).
4. Select a test frequency (Refer to "Test Frequency" de-
scribed on page 30.).
5. Measure the BER (Bit Error Rate) using the digital radio
tester. Enter a standard input signal into the transceiver
as a standard tone test pattern.
6. Adjust the input signal level to achieve the standard bit
error rate (BER).
(For example, if the BER is 5%, the display shows
"050000".)
C4FM (P25) Deviation Adjustment
1. The transceiver adjusts the deviation between High De-
viation ±1800Hz for the C4FM (P25).
2. The Symbol Rate Pattern is used when adjusting the
High Deviation for the C4FM (P25) (Refer to "Test Signal-
ing" described on page 30.). This test signal has a peak
deviation equal to π/2 1800Hz = 2827Hz.
ADJUSTMENT
Adjustment Points
■ TK-5710/5710H
CN7
+B
CLKC
32K OUT
TX-RX UNIT (X57-7030-10)
Component side
CN3
+B
KCH-16
FINAL UNIT (X45-3750-10)
: TK-5710(B)
Component side
CN1
TX
CONTROL UNIT (X53-4120-10)
Component side
CN152
TX
CN150
TX
L223 L222 L221
CN201
L224 L226
L225 L227
CN202
2
1
EP
MB
DAT
CLK
UL
CVu
CV
CN4
GND
Vg1
FINAL UNIT (X45-3760-10)
: TK-5710H(B)
Component side
Vg2
+B
Vgc
VR1
+B
Vgc
Vgc
Vg3
CN1
TX
CN10
VR1
CN2
RX
CN200
RX
L230
L228
L229 L231
L232
2
QUAD
1
SLO
CN203
CN10
REV FWD
8T
CN2
RX
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