Rtty Operation; Sstv (Slow Scan Tv) Operation; Use Of Monitor Switch - Kenwood TS-820S Instruction Manual
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Also See for TS-820S:
- Service manual (82 pages) ,
- Instruction manual (47 pages) ,
- Operating manual (46 pages)
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4.19
RTTY OPERATION
4.21
OPERATION
WITH A PHONE PATCH
The !S-820S
has
rear
panel
jacks
to facilitate
using
the
TS-820S
with
a phone
patch.
The PHONE
PATCH
OUT jack
has an impedance
of 4 '""'"' 16 ohms
and the PHONE
PATCH
IN jack requires
a high impedance
input.
See the instruction
sheet
of the phone
patch
for
cabling
instructions.
4.22
USE OF MONITOR SWITCH
For
RTTY
operation.
the
use
of
demodulator
and
teletypewriter
is essential.
The demodulator
should be de-
signed to operate from audio inputs and equipped with a fil-
ter for
2125/2295
Hz (NARROW.
170 Hz shift)
or
2125/2975
Hz (WIDE. 850 Hz shift).
To key-in the FSK circuit of TS-820S.
insert a relay coil into
the closed loop circuit of teletypewriter
and connect the re-
lay contact to the RTTY KEY jack on the rear panel.
Fig. 10
shows the relationship
between the transmit and receive fre-
quencies of TS-820S.
The frequency shift of the FSK circuit is preset at the factory
to NARROW but it can be changed to WIDE by inserting the
connector
as shown in Fig. 11
When operating
at the
WIDE position, turn theJF SHIFT knob in the ..-"
direction
by about 1.2 kHz so that the mark and space signals are well
balanced during reception.
If a CW filter (option) is used for
NA RROW operation. change the position of the connector of
the IF unit (refer to "Operation
with CWo Filter")
Setting the MODE switch to FSK automatically
decreases
the input power of the final stage. permitting
a long time of
continuous
operation.
To monitor
the
quality
of transmit
signal during
sse
operation.
set the MONITOR switch to ON to demodulate
part of transmit IF signal
This feature is useful when checking modulation conditions
or adjusting the RF speech processor.
When monitoring.
use a headphone to avoid howling effect.
Note that if the H SW switch is OFF or the DRIVE knob is
incorrectly
adjusted.
the
ALC
circuit
does
not operate
properly. causing the level of transmit IF signal to become
extremely high which results is distortion
in the signal being
monitored.
4.20
SSTV (SLOW SCAN
TV) OPERATION
SSTV operation
can be accomplished
by simply
connecting
the output
of SSTV camera
to the PHONE
PATCH
IN jack
(or MIC
connector)
and the
input
of SSTV
monitor
to the
PHONE
PATCH
OUT jack
(or SPEAKER
jack).
When
transmitting
signals
from the SSTV camera.
adjust its
output
so that the input power
of the final stage
is less than
100W
(less than
125 mA Ip).
~
~)
0
0
.0
Fig.11
Change of the FSK WIDE-NARROW
23
..-
j:
0
CARRIER UNIT 0
0 ~ll
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