TS-990S
195
ADJUSTMENT
Transmitter Section
Item Condition
Measurement Adjustment
Specifi cations/Remarks
Test-
equipment
Unit
Terminal
Unit Parts Method
• Perform the following in the adjustment mode. Item 1 and 7~35 have been adjusted;
To terminate the adjustment menu in the middle, save your settings with Menu No. 128.
1. ALC refer-
ence voltage
1) Menu No. : 67 (14.1MHz,
USB) Transmit
DVM TX-RX
(A/2)
TP1
(ALC)
Front
panel
[UP]/[+]
(F5) or
[DOWN]
/[-](F4)
Set the adjustment
value wiithin the limit
of the specifi ed volt-
age.
2.5V±0.1V
2. TX IF Gain 1) Main display f.:
18.100000MHz
Mode: CW
DRV: ON
Transmit
Connect the spectrum analyz-
er input to J700.
After the adjustment, discon-
nect the cable from J700.
50
dummy
Oscillo-
scope
Spectrum
analyzer
J700
(DRV)
TX-RX
(A/2)
L720
L721
Output level max. –4dBm or more
3. TX IF Gain
Check
1) Main display f.:
18.100000MHz
Mode: CW
DRV: OFF
Transmit
Disconnect the cable from
CN800 and connect the spec-
trum analyzer input to CN800.
After the adjustment, discon-
nect the cable from CN800.
CN800 Check the output
level.
–4dBm or more
4. TX HF BPF
(49~54M)
Check
1) Main display f.:
50.000000MHz
Mode: CW
Transmit
Check the drive
output level.
5. Final idling
current
1) Main display f.:
51.990000MHz
Mode: USB
Final unit (A/2) VR1~4: MIN
Transmit
Ammeter Final
(A/2)
DC-DC
(A/3)
CN36
CN16
Final
(A/2)
Check the default
current (I
0
).
Disconnect the lead wire with
connector (E37-1612-05) that
is connected between the
CN36 and CN16, and attach
jig cable (W05-1776-00).
When you adjust VR1, con-
nect each pin 1 of jig cable to
an ammeter. When you adjust
VR2, connect each pin 3 of jig
cable to an ammeter. (Refer
to page 162.)
After the adjustment, discon-
nect jig cable and reconnect
the lead wire with connector
(E37-1612-05) to its original
position.
VR1 I
O
+ 650mA ±50mA
VR2 1500mA ±100mA
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