SSB Modulator Balance
D With the transceiver tuned to 14.200.0 MHz,
USB mode, connect a 50-Q dummy load
to
the
antenqa jack, and
RF
millivoltmeter to J1005.
0
Set the
MIC
control fully ccw (min.),
RF PWR
control fully cw (max.). Key the transmitter,
and adjust VR 1008 for minimum indication on
the
RF
millivoltmeter.
AM Output Adjust
D Tune the transceiver to 14.200.0 MHz, AM
mode, and connect the wattmeter and 50-Q
dummy load to the antenna jack.
D Set the
RF PWR
control fully cw (max.) and the
MIC
control fully ccw (min.). Next key the
transmitter and (with no modulation) adjust
VR 1020 for 25 watts on the wattmeter.
Side-Tone
&
Beep Level
D Connect a AF millivoltmeter across a 4-Q
resistor or speaker connected to the
EXT-SPKR
jack.
D Connect the CW key to the
KEY
jack, adjust the
RF PWR
control fully ccw (min.), then key the
transceiver.
D AdjustVR2001 on the Local Unit for 150 mV
± 20 mV.
Speech Processor Check
D Set VR 1012 to the 12 o'clock position, the
MIC
gain to the 10 o'clock position and the
RF PWR
control fully clockwise (max.). Inject a 1-kHz
TC4001
Alignment
signal from the AF generator to the microphone
jack (pin 8).
D With the wattmceter and dummy load connected
to the antenna jack, tune to 14.200.0 MHz, USB
mode, key the transmitter and adjust the SG
level for an ALC meter indication of S-3.
D Press the
PROC
button, and confirm an ALC
meter indication of S-5 or more.
CW Semi-Beak-in Delay Time
D Adjust VR1015 to the 12 o'clock position,
then set the
RF PWR
control fully ccw (min.),
and select CW mode.
D Repeatedly key and un-key the transmitter, ad
justing VR1015 for a delay time of approxi
mately 1 second following key-release.
Transmitter Carrier Point
(LSB)
D Temporarily jumper TP2003 t o chassis
ground, then connect the AF signal generator
to the
MIC
jack, and adjust the output level for
3 mV.
D Select USB mode, tum the transceiver off, then
press and hold the
SSB &
FM buttons together
while turning the transceiver on again (this
places the transceiver in the carrier-point set
ting mode, next select LSB mode for the first
carrier point adjustment step).
D (a) Set the
MIC
control to the 12 o'clock posi
tion and
RF PWR
control fully cw (max).
D
(b)
Key the transmitter, and adjust the
AF
SG
level to where the ALC meter indication de
flects no further.
LPF Unit Alignment Diagram
3-5
FT-840 Technical Supplement
Содержание FT-840
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