Kenwood TKR-850 Service Manual page 39

ATTEN 20dB MKR –26.17dBm
RL 10.0dBm 10dB/ 465.00MHz
MKR
465.00MHz
2.5MHz 2.5MHz
D
–26.17dBm
3dB Max.
G
CENTER 465.00MHz
RBW 300kHz * VBW 300kHz
BPF center frequency (Factory-default)
K : 465MHz, E : 455MHz, K2 : 496MHz,
K3 : 415MHz
Fig. 1
Fine-Tuning the TKR-850
"ADJUSTMENT" items described in the Service Manual
for the TKR-850 give the factory-default adjustment proce-
dure covering all adjustment items.
However, it is not necessary to adjust all the items when
adjusting the power, deviation, receiver sensitivity, etc at the
frequency of the channel to be used by the TKR-850.
Adjustment procedure at the frequency of the
channel to be used
1. Program a channel frequency using the FPU (KPG-91D).
2. From the FPU menu, select in the order of "EDIT", "Test
Frequency" and "CH paste" to rewrite the test frequency
from the factory-default to the one to be used for the
channel.
Alignment
Item Condition
1. Setting 1) Connect the unit to a suitable DC power supply.
1) Turn the DC source switch on after connecting a PC and FPU cable to the radio. → "E1" appears on LED display
2. Write test
frequency 2) Write the test and shipping frequency to the radio.
3) End of test frequency writing.
3. Setting 1) Connect the unit to a suitable DC power supply.
2) Turn the power switch on after connecting a PC and FPU cable to the radio.
3) Start up the program for the adjustment.
ADJUSTMENT
ATTEN 10dB
RL –32.0dBm
3dB Max.
MKR
25.00kHz
D
–42.17dB
G
CENTER 44.85000MHz
SPAN 50.00MHz
RBW 300Hz * VBW 1.0kHz
SWP 50ms
MCF : Wide
Measurement
Test-
Unit
equipment
MKR –42.17dB
10dB/ 25.00kHz
5.5~7.5kHz 5.5~7.5kHz
D
More than
40dB
25kHz
G
SPAN 50.00kHz
SWP 2.0sec
Fig. 2
Erase all channel frequencies rewritten through this op-
eration and press the ENTER key to retrieve the factory-
default test frequency.
Refer to the explanation given under HELP for the FPU
(KPG-91D) for details.
3. Check whether the frequency rewritten under the "Test
mode" of the FPU (KPG-91D) is correct, then select the
item to be adjusted from the FPU (KPG-91D) menu and
adjust the set value for the item to an optimum value with
the "TEST" tag.
Note :
After adjustment of the "Max. Deviation", be sure to
check the "DQT balance".
The "5-tone" adjustment is required only for the E
market products.
Adjustment
Terminal Unit Parts
TKR-850
ATTEN 10dB MKR –46.000dB
RL –32.0dBm 10dB/ 15.00kHz
More than More than
3dB Max.
3.75kHz 3.75kHz
MKR
15.00kHz
–46.000dB
15kHz
CENTER 44.85000MHz
RBW 300Hz * VBW 1.0kHz
MCF : Narrow
Fig. 3
Specifications/Remarks
Method
→ Green (BUSY) LED lights up
More than
40dB
SPAN 50.00kHz
SWP 2.0sec
39