Alinco DR-235, Service Manual

Page: 30 / 40

2) VCO and RX Adjustment Specification
ITEM CONDITION UNIT ADJ. SPOT ADJUSTING MRTHOD
Adjustment
Frequency
223.50MHz
TX
MAIN VR110 Adjust so that Tx Frequency becomes
within 223.50MHz+/- 100Hz
VCO
Adjustment 224.99MHz
RX
MAIN L123 Adjust so that PD voltage becomes 2.2V
VCO
Confirmation
224.99MHz
RX
MAIN Confirm if PD voltage becomes less than
6.2V
Rx Signal
Sensitivity
Adjustment
223.50MHz
216.05MHz
223.50MHz
250.05MHz
MAIN L105, L104
L103, L107
L102
Repeatedly adjust so that the Rx sensitivity
becoms in maximum/.
Confirm:
At-7dBu SINAD more than 12dB
At-8dBu SINAD more than 12dB
At-3dBu SINAD more than 12dB
Squelch
Adjustment
223.50MHz
SSG OFF
Indicate 01
MAIN VR101 Adjust so that the squelch stops at
perfectly close location
S Meter
Adjustment
223.50MHz
SSG 20dBu 1KHz
Indicate 01
MAIN
VR102 Adjust so that all the indicator appears
3 ) T X A d j u s t m e n t S p e c i f i c a t i o n
ITEM
CONDITION UNIT
ADJ. SPOT
ADJUSTING MRTHOD
HI POWER
Adjustment
223.50MHz
HI POWER
MAIN VR103 Adjust to 25.0 + /-1 -0W
MID POWER
Adjustment
223.50MHz
MID POWER
MAIN VR104 Adjust to 10.0 +/- 1.0W
LOW POWER
Confirmation
223.50MHz
LOW POWER
MAIN Confirm if it becomes 4.5 + /-1 .0W
Maximum
Deviation
Adjustment
223.50MHz
MOD
1 KHz 40mVemf
WIDE
MAIN VR107 4.5+/-0.1 KHz/DEV
Maximum
Deviation
Adjustment
223.50MHz
MOD
1KHz40mVemf
NARROW
MAIN
VR105
2.2 +/- 0.1 KHz/DEV
Mic Gain
Adjustment
223.50MHz
MOD
1KHz 4mVemf
WIDE
MAIN VR106 3.0 +/-0.1 KHz/DEV
CTCSS
Modulation
Level
Confirmation
223.50MHz
88.5Hz
MAIN
800 +/- 200HZ/DEV
3KHzLPF ON
DCS
Modulation
Level
Adjustment
223.50MHz
255 Code
MAIN VR108 800 +/- 50Hz/DEV
3KHzLPF ON
1750Hz
Modulation
Level
Adjustment
223.50MHz
1750Hz
MAIN VR109 3.0 +/-0.5KHz/DEV
DTMF
Modulation
Level
Confirmation
223.50MHz
DTMF 1
Press the V/M key
during TX
MAIN 3.0 +/- 0.5KHZ/DEV
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