Ber (Bit Error Rate) Measurement; C4Fm (Apco) Deviation Adjustment; Adjustment Points - Kenwood TK-5710 Service Manual

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 54.).
2. Select "20" for test signaling (Refer to "Test Signaling"
described on page 55.).
When "20" is selected for the test signaling, the filter is
automatically selected to "APCO".
(If there is no RF input signal, the display shows
"500000")
3. Select a filter (Refer to "Filter Mode" described on page
55.).
4. Select a test frequency (Refer to "Test Frequency" de-
scribed on page 55.).

Adjustment Points

CN7
+B
CN1
TX
CN4
GND
Vg1
CN3
+B
Vg2
Vgc
+B
ADJUSTMENT
CN10
FINAL UNIT (X45-3750-10)
: TK-5710(B)
Component side
VR1
CN2
RX
CN10
FINAL UNIT (X45-3760-10)
: TK-5710H(B)
Component side
REV FWD
+B
VR1
Vgc
Vgc
8T
Vg3
CN1 CN2
TX RX
TK-5710
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 (APCO) Deviation Adjustment

1. The transceiver adjusts the deviation between High Devia-
tion ±1800Hz for the C4FM (APCO).
2. The Symbol Rate Pattern is used when adjusting the High
Deviation for the C4FM (APCO) (Refer to "Test Signaling"
described on page 55.). This test signal has a peak devia-
tion equal to π /2 1800Hz = 2827Hz.
CLKC
32K OUT
CN150
TX
TX-RX UNIT (X57-7030-10)
Component side
EP
MB
DAT
CLK
UL
CVu
CV
( )
B /5710H
CONTROL UNIT (X53-4120-10)
Component side
CN152
TX
L223 L222 L221
CN201
L224 L226
L228
L225 L227 L229
CN202
2
1 L232
SLO
( )
B
CN200
RX
L230
L231
2
QUAD
1
CN203
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