4 - 4
4-3 TRANSMITTER ADJUSTMENTS
ADJUSTMENT ADJUSTMENT CONDITION
MEASUREMENT
VALUE
ADJUSTMENT
POINT
UNIT LOCATION UNIT ADJUST
IDLING
CURRENT
(for drive)
1
• Display freq. : 14.100000 MHz
• Mode : CW (Key up)
• Preset R11, R18 on the PA unit to
max. CCW
• [RF POWER] : Max. CW
• [TUNER] : OFF
• Transmitting (without key)
PA Unsolder W29.
Connect an ammeter to
the unsoldering points
of W29.
250 mA PA R11
After adjustment, re-solder the wire (W29) on the PA board
(for fi nal
amplifi er)
2 • Transmitting (without key) PA Unsolder R28 (L8
side).
Connect an ammeter to
the unsoldering points
of R28.
500 mA PA R18
After adjustment, re-solder the wire (W29) on the PA board
TX PEAK 1 • Display freq. : 14.100000 MHz
• Mode : USB
• Set following selections, controls
and functions as :
[VOX] : OFF , [ TX] : OFF
PBT1 : Center , PBT2 : Center
Filter : 2.4 kHz
[RF POWER] : Max. CW
[MIC GAIN] : Center
[TUNER] : OFF
[METER] : METER Po
[MONITOR] : OFF
• Apply no audio signals to [MIC]
connector.
• Transmitting
MAIN-A Connect a digital
multimeter or oscil-
loscope to the check
point CP243.
0.06 V MAIN-A R247
2• Connect an audio generator to
[MIC] connector and set as:
Frequency : 1.5 kHz
Level : 1 mVrms
• Transmitting
Rear
panel
Connect an RF power
meter to [ANT1] con-
nector.
50 W Front
panel
[MIC GAIN]
control
3 • Transmitting Maximum output
power
MAIN-A L261
4 • [MIC GAIN] : Center
• Preset L1701, L1702's top to same
high with coil's case.
• Connect an audio generator to
[MIC] connector and set as:
Frequency : 1.5 kHz
Level : 10 mVrms
• Transmitting
RF-B Connect an RF volt-
meter the check point
J201.
Maximum level RF-B L1801,
L1553,
L1702,
L1701
Adjust in sequence L1801, L1553, L1702, L1701, L1702, L1701
TRANSMITTER
TOTAL GAIN
1 • Display freq. : 14.100000 MHz
• Mode : USB
• [MIC GAIN] : Center
• Connect an audio generator to
[MIC] connector and set as:
Frequency : 1.5 kHz
Level : 1 mVrms
• Transmitting
Rear
panel
Connect an RF power
meter to [ANT1] con-
nector.
50 W MAIN-A R263
To Next Page
Loading...
