TONO Theta 7000, Instruction Manual

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(2) In BAUDOT (RTTY) mode
Receive RTTY signals with a wireless set. Gradually increase the frequency of AF output from the
lower value with VFO or RIT of the wireless set. Confirm that the MARK indicating LED lights first.
Stop increasing the frequency when when the MARK indicating LED lights again and comes to light at
the maximum brightness. SPACE indicating LED lights at this moment if the shift width of RTTY sig-
nals agrees with the setting of the computer. Turn the FINE tuning volume; stop turning at the maxi-
mum brightness of SPACE indicating LED.
If SPACE indicating LED does not light, turn the FINE tuning volume to catch the position that
makes it light. If the position cannot be caught, it is because of disagreement of shift width of RTTY
signals and FREQ.SHIFT setting of the computer. Adjust the setting so as to make SPACE indicating
LED light and turn the FINE tuning volume to lighting the brightest.
Right characters are to be displayed on the screen by the tuning mentioned above. If not, change
the speed setting. If not, even after changing the speed setting, turn POLARITY switch to INV. In the
case that all of these procedures result in failure, input signals are judged not to be RTTY. For ama-
teur communication, 170 Hz shift is most commonly used; for business communication, 850 Hz and
50 Hz shift are usually used.
In addition, monitoring of the output of MARK filter and that of SPACE filter are obtainable by
turning SPEAKER switch to MARK and speaker switch to SPACE respectively. The output of MARK filter
and SPACE filter can function in lieu of MARK indicating LED and SPACE indicating LED.
FREQ.SHIFT Shift width Mark Space
N 170 Hz 2125 Hz 2295 Hz
M 425 Hz 2125 Hz 2550 Hz
W 850 Hz 2125 Hz 2975 Hz
Table 6
When error in CASE (LTR or FIG) is often made with much noise, make the UNSHIFT ON SPACE
switch ON. For errors in CR.LF, make CR.LF CANCEL switch ON. CR is replaced by = (equal) and LF by
_ (underline), and double writing error can be avoided.
In the case of tuning by cross pattern made on oscilloscope, adjust VFO and RIT of a wireless set
and FREQ.FINE tuning volume of the computer to make amplitude both in V-direction and in H-direc-
tion the maximum.
(3) In ASCII mode
Receive ASCII signals from a tape recorder or from a microcomputer. MARK indicating LED and
SPACE indicating LED do not light. Monitoring with speaker is impossible. Receive signals of 2400 Hz
for mark and 1200 Hz for space in accordance with KCS.
4.8 Recording of signals during receiving
In the case of CW and BAUDOT (RTTY) mode, recording is enabled by connecting PHONE jack of
the computer with the microphone terminal of a tape recorder.
Recorded signals can be displayed again on the screen by connecting an earphone terminal or ex-
ternal speaker terminal of the tape recorder with CW or BAUDOT pin jack of the computer.