Icom IC-821H Instruction Manual page 32

29
4 RECEIVE AND TRANSMIT
E Functions for AFSK
= The transceiver does not have an FSK mode for
RTTY, AMTOR, PACKET, etc., however, you can
operate these using AFSK in SSB or FM mode.
The transceiver accepts data speeds of up to 9600
bps. When using 9600 bps, set the transceiver to
9600 bps data mode using set mode with the [M/S]
switch. (p. 43)
When operating AFSK, connect external equipment
to the ACC socket on the rear panel or to the
microphone connector on the front panel as in the
diagram below.
© Connections for AFSK
Connections via rear panel
(for 9600 bps or 1200 bps operation)
Use FM mode for
9600 bps operation.
Use SSB or FM
mode for 1200 bps
operation.
[ACC(1)] socket
(Rear panel view)
Remove the ACC plug or turn the TNC power OFF
during phone operation. The modulation input from
the ACC socket is always applied to the modulation
circuit.
Connections via front panel
(for 1200 bps operation only)
Use SSB or FM mode
for operation.
[MIC] connector
(Front panel view)
A hen connected to the [MIC] connector, [MIC] and
GY, [AF] control adjustment is required.
When connected to the [MIC] connector, [MIC] and
[AF] control adjustments are required. The [MIC]
connector accepts up to 1200 bps.
Y
SS
MK WW "upon
OPERATION NOTES FOR 9600 bps
e Set the transceiver to 9600 bps data mode.
- See "Setting the ACC socket" for selection.
e Set the GMSK output level of the terminal unit to
1.0 V p-p (350 mV rms).
-When exceeding 1.6 V p-p, the transceiver's
modulation input limiter stops modulation.
- At this time, the [TX] indicator's brightness fades.
e AF output from the transceiver is continuous and
is not cut by the squelch circuit.
Terminal Node Controller (TNC)
or Scan converter
AFSK/GMSK output
Ground (GND)
AF/GMSK input
1200 bps RX input*'
PTT
SQUELCH input"
*' Some 9600 bps TNCs have this terminal. Connect the
1200 bps RX input when required.
* Connect the SQUELCH line when required.
Terminal Node Controller (TNC)
or Scan converter
AFSK output
AF input
Ground (GND)
PTT
SQUELCH input*
* Connect the SQUELCH line when required.