Receiver Section - Kenwood TS-990S Service Manual

TS-990S

Receiver Section

Item Condition
• Perform the following in the adjustment mode. Item 7, 8, 9, 11, 12, 13 and 22~60.
To terminate the adjustment menu in the middle, save your settings with Menu No. 128.
*1: Do the following preparation prior to the 8.248MHz trap adjustment of the item 1 and adjustments of the item 2~5;
• Remove the Preselector unit from the RX unit.
• Connect CN26 and CN53 using a coaxial cable (E37-1571-15)
1. MAIN RX 1) Main display f.:
Trap fre- 14.200000MHz
quency Mode: USB
P.AMP: ON
• 1MHz Spectrum analyzer setting
Start Frequency: 0MHz
Stop Frequency: 2MHz
TG level: 0dBm
Disconnect the cable from
CN1 and connect the track-
ing generator output to CN1.
Disconnect the cable from
CN11 and connect the spec-
trum analyzer input to CN1.
• 11.7MHz 2) Main display f.:
14.200000MHz
Mode: USB
P.AMP: ON
Spectrum analyzer setting
Center Frequency: 11.7MHz
Frequency span: 2MHz
TG level: -10dBm
• 15.501MHz 3) Main display f.:
14.200000MHz
Mode: USB
P.AMP: ON
Spectrum analyzer setting
Center Frequency:
15.501MHz
Frequency span: 2MHz
TG level: -10dBm
After the adjustment, discon-
nect the cable from CN11,
and connect the original
cable.
• 8.248MHz 4) Main fi splay f.: 7.200000MHz
(adjustment Mode: USB
1) *1 P.AMP: ON
Spectrum analyzer setting
Center f.: 8.248MHz
Frequency span: 1MHz
TG level: 0dBm
Disconnect the cable from
CN93 and connect the spec-
trum analyzer input to CN93.
168
ADJUSTMENT
Measurement
Test-
Unit Terminal Unit
equipment
Tracking RX CN1 RX
generator (A/2) CN11 (A/2)
Spectrum
analyzer
CN1
CN93
Adjustment
Parts Method
L9 Adjust the coil to get
a null point at 1MHz
as shown.
L8 Adjust the coil to
get a null point at
11.7MHz as shown.
L7 Adjust the coil to
get a null point
at 15.501MHz as
shown.
TC1 Adjust each trimmer
TC2 to get a null point at
8.248MHz as shown.
Specifi cations/Remarks
1.00MHz
11.700MHz
15.501MHz
8.248MHz