Advanced Connections - Icom IC-820H Instruction Manual

ma Linear amplifier connections
to an antenna
connector,
[144MHz ANT] or
[430MHz ANT].
The maximum i
output current of
the ACC(1) socket
is 20 mA. When
the linear amplifier
requires more
current for |
switching, an |
external relay is
necessary.
ADVANCED CONNECTIONS 3
iS to antenna
to SEND f to ALC jack
jack
4% NOTE: Turn the linear amplifier
OFF when the operating band is
not selected as the main band.
This is because the "SEND" line
goes to ground regardless of the
selected band while transmitting.
MA GGG
fa AFSK terminal unit connections
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 speed of up to 9600
bps. When using 9600 bps, set the internal switch to
the "PACT" (packet) position. Refer to p. 48 for
switch location.
USING THE ACC(1) SOCKET
(Rear panel view)
@@60 68
USING THE MICROPHONE CONNECTOR
(Front panel view)
When operating AFSK, connect external equipment
to the ACC(1) socket on the rear panel or to the
microphone connector on the front panel as in the
diagram below.
When connected to the [MIC] connector, [MIC] and
[AF] control adjustments are required. The [MIC]
connector accepts up to 1200 bps.
AFSK terminal unit (TU) or
Terminal Node Controller (TNC)
AF input
SQUELCH input*
PTT
Ground (GND
onnect the SQUELCH line (©) when required.
*
QO
OPERATION NOTES FOR 9600 bps
e Set the internal switch to the "PACT" (packet) position.
- See p. 48 for switch selection.
e Set the AFSK output level of the terminal unit to
1.0 V p-p (850 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.
Q\UW\)-»E=>=—r"
14