Kenwood TS-590S, Руководство по обслуживанию

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TS-590S
8
Receiver Circuit
In an amateur frequency band or mode that requires anti-
proximate interference, the receive signal passes through
the double conversion RX-1 path, and in other frequency
bands and modes, it passes through the triple conversion
RX-2 path. (Refer to table 2)
Mode SSB CW FSK AM FM
RX-1
path
Conversion
method
Double -
IF fre-
quency
1st 11.374MHz -
2nd 24kHz -
RX-2
path
Conversion
method
Triple
IF fre-
quency
1st 73.095MHz
2nd 10.695MHz
3rd 24kHz 455kHz
Table 2 Mode, conversion method, and IF frequency
LO3
DDS AD9835 (DEN2)
USB LSB CW CW-R CWN
RX
TX RX TX RX TX RX TX RX TX
IF73M
IF11M
RX
<
21.3M,
21.5
≤
RX
21.3
≤
RX,
RX
<
21.5
Filter offset 1 –46.5k +1.5k –46.5k –46.5k –1.5k –1.5k 0 0 0 0 0 0
CW pitch - - - - - - - - - - -
FSK tone - - - - - - - - - - -
CAR cor-
rection
IF10M_2.7k +(CAR1) +(CAR1) –(CAR1) –(CAR1) +(CAR1) +(CAR1) +(CAR1) +(CAR1) - -
IF11M_2.7k +(CAR2) +(CAR2) –(CAR2) +(CAR2) +(CAR2) - -
IF11M_500 +(CAR3) +(CAR3) –(CAR3) +(CAR3) +(CAR3) - -
LO3
DDS AD9835 (DEN2)
CWN-R FSK FSK-R AM FM
RX TX RX TX RX TX RX TX RX TX
Filter offset 1 0 0 0 0 0 0 0 0 0 0
CW pitch - - - - - - - - - -
FSK tone - - - - - - - - - -
CAR cor-
rection
IF10M_2.7k - - - - - - - - - -
IF11M_2.7k - - - - - - - - - -
IF11M_500 - - - - - - - - - -
CAR correction: SSB IF-Filter adjustment volume. 0 when using Narrow option fi lter.
(CAR1): IF 10.695MHz, SSB Normal fi lter compensation value
(CAR2): IF 11.374MHz, Normal fi lter compensation value
(CAR3): IF 11.374MHz, Narrow fi lter compensation value
Table 1-2 LO3 frequency shift data
■
From the antenna terminal to the preamplifi er (Q236)
The receive signal from the antenna terminals (ANT1/
ANT2) passes through the antenna changeover relay (K44)
in the Final unit (X45-391 A/2), the antenna tuner’s IN/
THROUGH changeover relay (K45), the transmission/recep-
tion changeover relay (K46), and an image fi lter, and is sent
from CN51 to the TX-RX unit (X57-785 A/2)’s CN100 (RAT)
through a co-axial cable.
The signal input into the TX-RX unit passes through the
RX ANT changeover relay (K101) and enters the attenua-
tor circuit (ATT) which is approximately 12dB. This can be
switched to approximately 20dB by removing the CN101
short jumper. Then, the signal passes through LPF for IF
trap, the surge absorption limiter, and the BC band attenuat-
ing circuit (removes 30kHz to 1.705MHz), and enters the
BPF. In the BC band attenuating circuit, in order to avoid
interference by high-output broadcasting stations, 11.7MHz
and 15.5MHz trap circuit is inserted into E type only.
CIRCUIT DESCRIPTION