Icom IC-821H Instruction Manual page 33

© AFSK operation
Connect external equipment to the ACC socket as
described on the opposite page. Set the ACC
socket using set mode with the [M/S] switch in
advance. (See below.)
@ Select LSB, USB or FM.
- LSB is normally used.
- FM is used for PACKET.
(2) Adjust the audio output level with [AF].
- Use [SQL] when required.
@) Adjust the desired RF output power.
- When using the [MIC] connector for external equip-
ment connection, the [MIC] control should be ad-
justed.
(4) Control the transceiver from the connected PC or
TNC (TU).
© Setting the ACC socket
When operating AFSK, set the specifications of the
ACC socket to fit your TNC or scan converter in
advance.
(@ Push [SPCH*SET] for 2 sec. to enter set mode.
@ Push [M/S] once to select 9600 bps data mode
setting display, then rotate the tuning dial to-
select 9600 or 1200 bps.
- Specifications of the ACC socket (pins 1, 4 and 5)
are changed. See p. 9 for details.
RECEIVE AND TRANSMIT 4
e 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).
e Operating notes for PACKET
PACKET operating frequency in LSB mode differs
from the displayed frequency.
[Your operating freq.] = [Displayed freq.] — 2215 Hz
(when the frequencies of the PACKET demodulator in
your TNC are 2115 Hz/2315 Hz). .
e Frequency setting example for AFSK
- When operating RTTY at 144.090 MHz:
Set "LSB 144.092125 MHz" (if you use mark=2125
Hz/space= 2295 Hz).
- When operating PACKET at 144.110 MHz:
Set "LSB 144.112215 MHz" (if you use 2115 Hz/
2315 Hz).
@) Push [M/S] one more times to select the ACC
socket pins 1, 5 and 6 setting display, then rotate
the tuning dial to make a selection.
- When "nor" (normal) is selected, the ACC socket
(pins 1, 5 and 6) outputs main band signals. When
"Sub" is selected, the ACC socket (pins 1, 5 and 6)
outputs sub band signals.
4
NOTE: Select "nor" (normal) when operating data
, mode in satellite mode.
@ Push [M/S] two more times to select the modu-
lation input sensitivity setting display, then rotate
the tuning dial to make a selection.
- HI: 100 mV Lo: 2 mV
- This setting is ignored when 9600 bps data mode
(@) is selected and 1.0 Vp-p is set as a fixed value.
(©) Push [SPCH] to exit set mode.
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