Kenwood TS-830S Service Manual page 7

CIRCUIT DESCRIPTION
CAR OSCILLATOR
The CAR osc~llator
IS
composed of an oscrllator and t w o
quarts crystals The output frequency In each mode is grveri
In F ~ g u r e 1
During reception thls frequency can be v a r ~ e d
by the IF shift
VFO
The output frequency
IS
5 5-6 0 MHz D u r ~ n g CW
transmlsslon, the frequency w ~ l l be s h ~ f t e d
800 Hz
h ~ g h e r
than the reception frequency Therefore, real operating fre-
quencles w ~ l l always be d~splayed
CIRCUIT FEATURES
1. Optional filters available
The T S - 8 3 0 s
I S
e q u ~ p p e d w ~ t h 2 7 kHz f ~ l t e r s In both the
8 8 3 MHz and 455 kHz
IF'S. Narrow f~lters are separately
ava~lable for both 8 . 8 3 MHz and 4 5 5 kHz.
Table 7. STD and OP filter combinations
455 kHz filter
STD (CFJ455K5)
STD (CFJ455K5)
OP (option)
OP (option)
CFJ455K5
=
2.7kHz
OP (YG-455C)= 500Hz
OP (YG-455CN)=250Hz
IF jumper pins
CW1
CW2
CW3
CW4
6 dB bandwidth
Table 8. C W Crystal filter (L71-0211-05)
Y K-88C (Option)
8.83 M Hz filter
STD (Y K88S 1 )
OP (option)
STD (YK-88S1)
OP (option)
YK-88S1 =2.7kHz
OP (Y K-88C)
=
500Hz
OP (YK-88CN) =270Hz
Item
Center frequency fo
Center frequency deviation
6 dB bandwidth
60 dB bandwidth
Ripple
Loss
Guaranteed attenuation
Input and output impedance
-
k 2 kHz to f 1 MHz
Rating
8830.7 kHz
fo
?
150Hz at 6 dB
t 2 5 0 Hz or more
k g 0 0 Hz or less
2 dB or less
6 d B k 2 d B
80 dB or more within fo
+2 kHz to k 1 MHz
60012
//
1 5 pF
Table 9. C W Crystal filter (L71-0221-05)
YK-88CN (Option)
I
Item Rating
1
16 dB bandwtdth
1
k 2 5 0 Hz or more
I
Center frequency fo
Center frequency deviation
160 dB bandwidth
1
i-425 Hz or less
I
-
455.7 kHz
fo
f
5 0 Hz at 6 dB
-
--
Ripple
Loss
I
lmput and output impedance
I
2 kO// 15 pF
I
- -
-
2 dB or less
6 dB or less
Guaranteed attenuation
Table 10. C W Crystal filter (L71-0206-05)
YG-455C (Option)
80 dB or more
at 100 Hz to 455.1 kHz and
456.3 kHz to 2 MHz
Item
Center frequency fo
60 dB bandwidth
(
+250 Hz or less
I
Rating
455.7 kHz
Center frequency deviation
6 dB bandwidth
b -
fo
f
50 Hz at 6 dB
+
1 25 Hz or more
Ripple
-
Input and output impedance
1 .
2 kO// 15 pF
1
2 dB or less
Loss
Guaranteed attenuation
Table 11. C W Crystal filter (L71-0207-05)
YG-455CN
I
6dB or less
80 dB or more at
100 Hz to 455.3 kHz and
456.1 kHz to 2 MHz