I Operating Mode Notes; I Operating Frequency Notes; I Afsk Operation - Icom IC-910H Instruction Manual

I Operating mode notes

Use FM mode for 9600 bps operation.
Use SSB or FM mode for 1200 bps operation.

I AFSK operation

Connect external equipment to either the [DATA]
(MAIN or SUB) or [ACC(1)] socket as described on the
previous page. Set the ACC socket using the general
set mode in advance when you operate via the ACC
socket. (See below.)
q Push [M/S•BAND] to select the desired frequency
band.
w Push [FM] or [SSB/CW] to select the desired oper-
ating mode.
• LSB is normally used.
• FM is used for PACKET.
e Adjust the audio output level with [AF] control.
• Use [RF/SQL] when required.
r Adjust the desired RF output power.
• When using the [MIC] connector for external equipment
connection, the [MIC GAIN] control should be adjusted.
t Select operating mode.
y Control the transceiver from the connected PC or
TNC (TU).
qSelect wSelect desired
band. mode.
eAdjust for max.
detected level.
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DATA COMMUNICATION

I Operating frequency notes

◊ Operating notes for RTTY and AMTOR
RTTY or AMTOR operating frequency in LSB mode
differs from the displayed frequency.
[Your operating freq.] = [Displayed freq.] – 2125 Hz
(when the frequencies of the RTTY demodulator in
your TNC or TU are — mark = 2125 Hz and space =
2295 Hz).
◊ Operating notes for PACKET
PACKET operating frequency in LSB mode differs from
the displayed frequency.
[Your operating freq.] = [Displayed freq.] – 2125 Hz
(when the frequencies of the PACKET demodulator in
your TNC are — 2125 Hz/2315 Hz).
◊ Frequency setting example for AFSK
- When operating RTTY at 144.090 MHz:
Set "LSB 144.092125 MHz" (if you use mark=2125 Hz
and space=2295 Hz).
- When operating PACKET at 144.110 MHz:
Set "LSB 144.112215 MHz"
2115 Hz/2315 Hz).
IMPORTANT:
• Remove the microphone from the [MIC] connector
when operating below 1200 bps rate to protect
from noise coming from the microphone.
• During 9600 bps rate operation, noise signals from
the microphone may not effect PACKET signals.
However, PACKET signal transmission is inter-
rupted when [PTT] is pushed.
• Remove the ACC plug, or turn the TNC power OFF
during phone operation (SSB or FM). The modula-
tion input from the [ACC(1)] socket is always ap-
plied to the modulation circuit.
◊ Connections via front panel
When connecting a TNC or Scan converter, etc. to the
[MIC] connector, [MIC GAIN] and [AF] adjustments are
required. The [MIC] connector accepts up to 1200 bps.
Use SSB or FM mode for operation.
[MIC GAIN] and [AF] control adjustments are re-
quired.
9
(if you use
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