TS-5700
CIRCU IT D ES CRI PTI O N
• New Functions
The DSP used in the TS-5700 processes detected
AF signals. The DSP has various functions for pro
cessing digital signals . This section describes the
functions and other features.
1)
Transm ission filter processing
Three types of filters are used for transmission :
transmission sound quality setting filter, splatter filter,
and speech processor filter. Each of the filters is out
lined below.
•
Transmission sound quality setting filter
Comprised of 8-degree llR filters.
In SSB/AM, it consists of a band-pass filter, the
band is specified by the bandwidth and low edge
frequency.
In FM, it consists of a pre-emphasis filter.
•
Splatter filter
This filter also functions as an FM splatter filter. It
eliminates AF-AGC and limiter distortion.
SSB/AM/FM: 3.6kHz
•
Speech processor filter
The input filter is llR, and the output filter is FIR.
The bandwidth of this filter is linked with that of the
transmission sound quality setting filter.
•
Transm ission soun d qual ity setting fi lter
deg ree/attenuation
Type
Comprise
Degree Ripple (dB)
Attenuation (dB)
B P F
l l R
8
0
L :
Simp
l
e attenuation
H : 60
F M p re-e m p h a s i s
l l R
1 +3
-
-
Sp latter fi lter
l l R
6
0
S i m p l e atte n uation
P R OC-I N : Low-LPF
l l R
6
0
2 0/45
P R O C-I N : M id-S P F
l l R
6
0
2 8/53
P R O C- I N
·
H i-B P F
l l R
6
0
30/60
PROC-OUT Low-LPF
F I R
48
0 . 5
45
PR OC-OUT M id-LPF
F I R
48
0 . 5
40/45
P R O C-OUT : H i-LPF
F I R
48
0 . 5
2 0/45/2 0
2)
Receive fi lter processing
Filters used for reception include a high-pass filter
and a low-pass filter for slope tuning and a band-pass
filter for CW/FSK mode. 10-degree llR filters are used
as the low-pass filter, high-pass filter, band-pass filter,
delay equalizer, and deemphasis filter. They are out
line below.
•
SSB, AM, FM
AF high-pass filter/low-pass filter for slope tuning
•
CW, FSK
AF BPF
The delay equalizer improves the group delay char
acteristics. The maximum signal delay time is
30ms.
•
FM
A de-emphasis filter is inserted before the slope
tuning filter.
•
Degree/attenuation
Mode
Type
Comprise Degree Ripple (dB)
Attenuation (dB)
SS S/AM
L P F
l l R
6
0
70
SS B/AM
H P F
l l R
1 -4
0
S
i m
p
l
e attenuation/70
CW/FS K
B P F
l l R
6 - 8
0
65
CW/ F S K
E q u a l izer
l l R
2 - 4
A l l pass
All pass
FM
-
l l R
7
De-emphasis
-
fi lter
•
Band/setting code
B l a n k pa rts ca n n ot be set. The CW low edge: 200Hz or h i g h e r
N o .
SSB/AM SSB/AM cw
cw
FSK BPF
FSK BPF
Low cut
Hi cut Center Width
Center
Width
0
1 0 (0)
1 Ok
400
50
2 . 2 1 00k/1 .3600k
250
1
50
1 1 k
450
1 00
2 2 2 5 0 k/1 .3750k
500
2
1 00
1 . 2 k
500
200
2 3375k/1 .4875k
1 . 0k
3
1 50
1 3 k
550
300
2 5500k/1 . 7 000k
1 . 5 k
4
200
1 . 4k
600
400
5
250
1 . 5 k
650
600
6
300
1 . 6 k
7 0 0
1 k
7
350
1 . 7 k
750
2k
8
400
1 . 8 k
800
9
450
2 . 0 k
850
1 0
500
2 . 2 k
900
1 1
550
2 . 4k
950
1 2
600
2 . 6 k
1 . 0k
1 3
650
2 . 8 k
1 4
700
3 O k
1 5
750
3 . 2 k
1 6
800
3 . 4k
1 7
850
3 . 6 k
1 8
900
4 . 0 k
1 9
950
4.4k
2 0
1 O k
5 . 0 k
2 1
P KT-1
22
P KT-2
23
P KT-3
27
