TKR-750
39
Fine-Tuning the TKR-750
“ADJUSTMENT” items described in the Service Manual
for the TKR-750 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-750.
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.
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.
1. Setting
1) Connect the unit to a suitable DC power supply.
2. Write test
1) Turn the DC source switch on after connecting a PC and FPU cable to the radio.
→
“E1” appears on LED display
frequency
2) Write the test and shipping frequency to the radio.
→
Green (BUSY) LED lights up
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.
4. RX PLL lock
1) RX VCO A high
DVM
TX-RX
RX-CV
RX VCO TC350 1.50V
±
0.1V
voltage
CH : 11
(A/2)
(A3)
2) RX VCO A low
Check
8V or less
CH : 10
3) RX VCO B high
RX VCO TC351 1.50V
±
0.1V
CH : 3
(A3)
4) RX VCO B low
Check
8V or less
CH : 12
Item
Condition
Measurement
Adjustment
Specifications/Remarks
Test-
equipment
Unit
Terminal
Parts
Unit
Method
ADJUSTMENT
Alignment
More than
3.75kHz
More than
3.75kHz
ATTEN 10dB
RL –32.0dBm
10dB/
MKR –46.000dB
15.00kHz
MKR
15.00kHz
–46.000dB
D
G
CENTER 44.85000MHz
RBW 300Hz *VBW 1.0kHz
SPAN 50.00kHz
SWP 2.0sec
3dB Max.
15kHz
More than
40dB
5.5~7.5kHz
5.5~7.5kHz
ATTEN 10dB
RL –32.0dBm
10dB/
MKR –42.17dB
25.00kHz
MKR
25.00kHz
–42.17dB
D
G
CENTER 44.85000MHz
RBW 300Hz *VBW 1.0kHz
SPAN 50.00kHz
SWP 2.0sec
3dB Max.
25kHz
More than
40dB
Fig. 1
Fig. 2
Fig. 3
BPF center frequency (Factory-default)
K,E : 160MHz, K2 : 143MHz
1.5MHz 1.5MHz
ATTEN 20dB
RL 10.0dBm
10dB/
MKR –13.50dBm
MODULE
NOT FOUND
D
G
CENTER
RBW 300kHz *VBW 300kHz
SPAN 50.00MHz
SWP 50ms
3dB Max.
MCF : Wide
MCF : Narrow
