If Filter - Kenwood TS-590S Service Manual

TS-590S

IF Filter

The IF fi lter includes a DSP digital fi lter as well as mul-
tiple analog fi lters in the IF stage to have suffi cient tolerance
for unnecessary signals.
In the RX-1 path with enhanced anti-proximate interfer-
ence, the MCF (XF301) and crystal fi lter (XF474, XF475) are
Item
Nominal center frequency
Pass bandwidth
Attenuation bandwidth
Ripple
Insertion loss
Guaranteed attenuation
Center frequency deviation ±500Hz at 6dB
Terminating impedance
Item
Nominal center frequency
Pass bandwidth
Attenuation bandwidth
Ripple
Insertion loss
Guaranteed attenuation
Center frequency deviation ±1.5kHz at 3dB
Terminating impedance
Item
Nominal center frequency
Pass bandwidth
Attenuation bandwidth
Ripple
Insertion loss
Guaranteed attenuation
Center frequency deviation ±1.0kHz
Terminating impedance
14
CIRCUIT DESCRIPTION
XF301: L71-0656-15 XF474: L71-0657-05
11.374MHz 11.374MHz
±3kHz or more at 6dB ±1.35kHz or more at 6dB
±17.5kHz or less at 60dB ±4kHz or less at 60dB
1dB or less 2dB or less
3dB or less 6dB or less
70dB or more at fo±1MHz 80dB or more at fo±1MHz 80dB or more at fo±1MHz
±150Hz at 6dB
1kΩ // 6pF 900Ω // 9pF
XF371: L71-0605-05 XF472: L71-0230-15
73.095MHz 10.695MHz
±7.5kHz or more at 3dB ±7.5kHz or more at 3dB
±35kHz or less at 40dB ±25kHz or less at 18dB
1dB or less 0.5dB or less
3dB or less 2dB or less
70dB or more at
fo+(500~1000kHz)
30dB or more at fo±1MHz 60dB or more at fo±1MHz
70dB or more at
fo–(200~1000kHz)
-
2.5kΩ // –0.5pF 3kΩ // 2pF
CF591: L72-0998-05
455kHz
±6kHz or less at 6dB
±12.5kHz or less at 50dB
2dB or less
6dB or less
35dB or more at
fo±100kHz
2kΩ
Table 6 IF fi lter
inserted for the fi rst IF (11.374MHz). In the RX-2 path, MCF
(XF371) for the fi rst IF (73.095MHz), a crystal fi lter (XF473)
or MCF (XF471, XF472) for the second IF (10.695MHz), and
a ceramic fi lter (CF591) for the third IF (455kHz: FM only).
XF475: L71-0658-05
11.374MHz
±250Hz or more at 6dB
±0.75kHz or less at 60dB
2dB or less
Within 6±3dB
±150Hz at 6dB
100Ω // 90pF
XF471: L71-0664-05
10.695MHz
±3kHz or more at 6dB
±40kHz or less at 60dB
2dB or less
3dB or less
±1kHz at 6dB
1.2kΩ // 6pF
XF473: L71-0569-15
10.695MHz
±1.35kHz or more at 6dB
±300kHz or less at 60dB
2dB or less
6dB or less
60dB or more at
fo±300kHz
±150Hz or less at 6dB
1.2kΩ // 7pF