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5. DIRECTIONS FOR USE
5-1-3.
Operation
1) The unit is set so that the trace line will come to the
lowermost scale line when . is set to center. In the sit-
uation where the trace line is located off the screen, bring
it into view using the % control. In the bandscope mode,
. becomes a fine adjust and, in order to facilitate fine
adjustment, it is set to operate in increments of about
+ 2 div from the center line. This adjustment should be
performed at least 30 minutes after the POWER switch
is turned on.
2) Set <4 so that when the CAL MARKER switch of the ©
transceiver is switched to ON the marker signal comes
to the center line of the CRT. In the bandscope mode,
<4 becomes a fine adjust and, in order to facilitate fine
adjustment,
is set to operate in increments
of about
+2 div from the center line.
Because the bandscope is high in precision, and because
the internal temperature of the device tends to get rela-
tively high during operation, this adjustment should be
performed after the temperature has stabilized and os-
cillator circuit drift has subsided (about 30 minutes af-
ter turning on the power).
Note:
For instructions on how to display the TS-950's mar-
ker, refer to the TS-950 Instruction Manual, Section
4-1-1 ('Front Panel'' Explanation on ''Top Cover'').
3) When ~¢ has been properly set, turn the CAL marker
switch of the TS-950 to OFF to prepare for signal recep-
tion. Electric wave distributions such as that in Figure
4 can be observed.
:
The waveforms appear on the CRT so that the received
signal lies on the center line, waveforms with frequen-
cies higher than that of the received signal appear to the
right, and waveforms with frequencies lower than that
of the received signal appear to the left. When receiving
a high-amplitude signa!, spurious noise may be generat-
ed. In this case, turn down the gain using V. VARIABLE
or V.ATT.
4) Electric wave distributions can be selected having ranges
of +25 kHz,
+100 kHz, or + 250 kHz, centered around
the receive frequency. Select the most appropriate one
for a given situation.
The scan speed can be set to AUTO, FAST, or SLOW
(AUTO is set so as to provide the optimal scan speed for
each scan width). Choose the one which best suits the
situation. Note, however, that since setting of the scan
speed
causes a slip in the frequency, the adjustment
described in 2) must be redone.
Received signal
Figure 4. Electric wave distribution observed
suring signal reception
10
5-1-4.
Operation of Dual Watch Marker
The TS-950 includes a function that allows two signals to
be received simultaneously. In this case, the frequency in-
dicated on the main display of the TS-950 becomes the
center line of the SM-230's
display, and the frequency
shown
on the sub-display is displayed as a trace on the
SM-230's CRT screen. Display of the markers 'is accom-
plished through brightness modulation of the transmitted
signals.
Note:
The Dual Watch Marker is only effective when the
scan width of the SM-230 is set at +25 kHz.
5-1-5.
Adjustment of Dual Watch Marker
When a phase difference exists between the frequency var-
iation of the received signal and the Dual Watch Marker var-
iation, the Dual Watch Marker gain adjustment VR must be
adjusted. This is done by adjusting the Dual Watch Marker
position screw on the side panel of the unit. Adjustment
must result in each 1 div on the CRT scale line having the
value of 5 kHz.
In case a phase difference exists between the position of
signal reception and the Dual Watch Marker position, the
same adjustment screw is adjusted for alignment.
In doing so, first make the adjustment discussed in 2) of
5-1-3 for setting the transceiver's main and sub frequen-
cies to the same value. Then adjust the unit so that the mar-
ker trace comes to the center line of the CRT.
gain adjustment
Dual Watch Marker
position adjustment
5-2. OSCILLOSCOPE FUNCTION
The oscilloscope portion of the SM-230 is designed to offer
the exact same level of quality and precision found in dedi-
cated oscilloscope
units.
It has a wide-band
frequency
characteristic of DC ~ 10 MHz (- 3 dB) and a high sensi-
tivity of 10 mV/div,
making it comparable in performance
to units currently used in transceiver R&D.
5-2-1.
Initial Setup
When using for the first time, observation can be conduct-
ed immediately if the controls are set as follows:
Function
OSCILLOSCOPE
V. ATT
1/100 range
.
Center
V. VARIABLE
All the way clockwise
1 kHz~ 10 kHz range
<>
Center
H. VARIABLE
All the way clockwise
FOCUS
Center
INTENSITY
Center
Table
2
SWEEP RANGE
Dual Watch Marker
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