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5. DIRECTIONS FOR USE
5-3-2.
Initial Setup
When using for the first time, observation can be conduct-
ed immediately if the controls are set as follows:
MONI
MAX
Center
Function
RF ATT
Center
10~ 100 Hz
Center
SWEEP RANGE
H. VARIABLE
FOCUS
INTENSITY
Center
Center
Table
3
Note that when operating in the MONITOR mode, the fol-
lowing controls do not operate:
V. ATT
V. VARI.
GND switch
AC/DC switch
5-3-3.
Observation of Transmitted Waveforms
Set the controls of the SM-230 as shown in Table 1. Ad-
just the transciever to the best possible settings for trans-
mission and hook up the microphone.
If the unit is set to
transmit and sounds are spoken into the microphone, wave
forms will appear on the SM-230's CRT.
If the waveforms
do not appear, adjust the <1» and
knobs so that the waveforms come to the center of the CRT.
Next, adjust the INTENSITY of the trace as needed and ad-
just the FOCUS so as to produce an easily-viewed image.
Adjust the RF ATT, SWEEP RANGE, and H. VARI to bring
the waveform to the appropriate size.
sarees ge
Carrier leakage occuring
Single
Tone
Input
ideal waveform
Figure 6 shows the waveform that results if the transciever
is placed in the SSB mode, the SM-230's TONE generator
output is input into the transceiver's MIC terminal, and a
SINGLE TONE modulation is applied. (Refer to Table 3 for
the knob settings, and set the TONE
switch to either
1,000 Hz or 1,575 Hz.)
Figure
7 is the waveform
that results when
both the
1,000 Hz and 1,575 Hz of the TONE SW are both set to
ON. In this case, waveforms such as Figure 10 (A) may oc-
cur, that lack the constrictions. This indicates that the
balance has deteriorated slightly, due to factors such as the
value of the transciever's IF crystal filter or the frequency
characteristic of the MIC AMP.
Adjust the TWO-TONE
balance knob to obtain a normal
waveform as shown in Figure 10 (B). Perform the adjust-
ment in either the LSB or USB mode, whichever one is used
more frequently.
The amplitude of the TWO-TONE signal can be adjusted us-
ing the TWO-TONE output voltage adjustment knob locat-
ed on the side panel of the SM-230.
Figure 9 shows representative waveforms that result from
speaking into a microphone connected up to the transceiver.
Figure 9 shows waveforms resulting from hooking a key up
to the receiver and keying in the CW mode.
(A) before adjustment
(B) after adjustment
TWO-TONE
Output
Voltage Adjustment
Figure 10. Two-Tone Generator
Wavforms
Output
for
"'AH''
Vowel
Ideal waveform
MIC gain too high
Figure
7. TWO-TONE
Modulated
Output
Ideal waveform
12
|
MIC gain too high
GABA
Keying
Waveforms
Ideal waveform
With key click
Dirty contact points
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