Frequency And Signaling; Adjustment Item Supplement; Preparations For Tuning The Transceiver; Test Frequency - Kenwood TK-D240 Service Manual

4.2

Frequency and Signaling

The transceiver has been adjusted for the frequencies shown in
the following table. When required, readjust them following the
adjustment procedure to obtain the frequencies you want in ac-
tual operation.
Test frequency
CH RX (MHz)
1 155.05000
2 136.05000
3 173.95000
4 155.00000
5 155.20000
6 155.40000
7~16 -
Analog mode signaling
No. RX
1 None
2 None
3 QT 67.0 Hz
4 QT 151.4 Hz
5 QT 210.7 Hz
6 QT 254.1 Hz
7 DQT D023N
8 DQT D754I
9 DTMF Decode
(CODE: 159D)
10 None
11 Single Tone: 979.9Hz
12 None
13 None
14 MSK Decode
DMR mode signaling
No. RX
1 CC 00 Burst
2 PN9 Continuous Pattern
3 CC 00 Burst
5 CC 00 Burst
6 SYNC (Each slot) + PN9
Burst Pattern
4.3

Preparations for Tuning the Transceiver

Before attempting to tune the transceiver, connect the unit to a
suitable power supply.
Whenever the transmitter is tuned, the unit must be connected to
a suitable dummy load (i.e. power meter).
The speaker output connector must be terminated with a 8Ω
dummy load and connected to an AC voltmeter and an audio dis-
tortion meter or a SINAD measurement meter at all times during
tuning.
1-20 (No.RA035<Rev.001>)
TX (MHz)
155.10000
136.10000
173.90000
155.00000
155.20000
155.40000
-
TX
None
100Hz Square Wave
QT 67.0 Hz
QT 151.4 Hz
QT 210.7 Hz
QT 254.1 Hz
DQT D023N
DQT D754I
DTMF Encode
(CODE: 159D)
DTMF Encode (CODE: 9)
Single Tone: 979.9Hz
Single Tone: 1000Hz
MSK PN9
MSK Encode
TX
CC 00 Burst
PN9 Continuous Pattern
Maximum Deviation
Continuous Pattern
0 Continuous Pattern
SYNC (Each slot) + PN9
Burst Pattern
5 reference level adjustments frequency
Tuning point RX (MHz)
Low 136.05000
Low' 145.55000
Center 155.05000
High' 164.55000
High 173.95000
PN9:Pseudo-Random Pattern (for production only)

4.3.1 Adjustment item supplement

Adjustment Item
Receive Assist The lock voltage of VCO (Receive) is ad-
justed.
This item must be adjusted before all ad-
justment items for receiver section are
adjusted.
Transmit Assist The lock voltage of VCO (Transmit) is
adjusted.
This item must be adjusted before all ad-
justment items for transmitter section are
adjusted.
Frequency The Transmit Frequency is adjusted.
Ramp Offset Adjust this item to the optimal Ramp volt-
age.
High Transmit Power High Transmit Power is adjusted.
Low Transmit Power Low Transmit Power is adjusted.
Balance The transmit audio frequency re-
sponse is adjusted.
This item is adjusted so that the devia-
tion of 2kHz becomes the same devia-
tion of 20Hz.
This item must be adjusted before
all adjustment items for deviations are
adjusted.
Maximum Deviation Maximum Deviation of DMR is adjusted.
(DMR)
Maximum Deviation Maximum Deviation of Analog (Wide/
(Analog Wide/ Nar- Narrow) is adjusted.
row) This item must be adjusted before all ad-
justment items for tone deviations are
adjusted.
QT Deviation QT tone deviation is adjusted.
DQT Deviation DQT tone deviation is adjusted.
Single Tone Deviation The deviation of Single Tone used in "2-
tone" is adjusted.
VOX 1 VOX 1 Level is adjusted.
VOX 10 VOX 10 Level is adjusted.
Sensitivity 1 Band-Pass Filter is adjusted.
The performance of Receive Sensitiv-
ity is improved.
Sensitivity 2 Band-Pass Filter is adjusted.
The performance of the interfering
wave is improved.
RSSI Reference The minimum RSSI level for scan stop is
adjusted.
TX (MHz)
136.10000
145.60000
155.10000
164.60000
173.90000
Description