Kenwood TK-5310, Service Manual, Page: 47 / 97

TK-5310
47
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 41.).
2. Select ”20” for test signaling (Refer to "Test Signaling"
described on page 42.).
When "20" is selected for the test signaling, the filter is
automatically selected to "P25".
(If there is no RF input signal, the display shows
”500000”)
3. Select a filter (Refer to "Filter Mode" described on page
41.).
4. Select a test frequency (Refer to "Test Frequency" de-
scribed on page 42.).
C4FM (P25) Deviation Adjustment
1. The transceiver adjusts the deviation between High Devia-
tion ±1800Hz for the C4FM (P25).
2. The Symbol Rate Pattern is used when adjusting the High
Deviation for the C4FM (P25) (Refer to "Test Signaling" de-
scribed on page 42.). This test signal has a peak deviation
equal to
π
/2 1800Hz = 2827Hz.
Service Jig
■
Nut wrench
In order to turn the volume nut and the channel selector
nut, use a recommendation tool.
KENWOOD part No. : W05-1123-00
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”.)
ADJUSTMENT
Adjustment Points
S
2nd Lo
+
TX-RX UNIT (A/5) : TX-RX section
Foil side
BPF GND
BPF
CV
CLKC
32kout