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Icom IC-208H Manual

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11 OTHER FUNCTIONS
■ Packet operation
D Data speed
For packet operation, the transceiver can be set to one of two
data speeds: 1200 bps or 9600 bps.
q While pushing
[SET•LOCK],
push [PWR] for 1 sec. to enter
initial set mode.
w Push
[SET•LOCK]
or [S.MW•MW] to select the ‘BPS’ item.
e Rotate [DIAL] to select the desired data speed.
r Push
[PWR]
to exit initial set mode.
For 1200 bps operation—
• Disconnect the microphone plug from the microphone
connector during data transmission, otherwise the data
signal and voice signal are simultaneously transmitted.
For 9600 bps operation—
• When the transceiver is set for 9600 bps data transmis-
sion in set mode, the microphone signal is automatically
cut. Therefore, it is not necessary to disconnect the mi-
crophone plug from the connector in this case.
•
When pushing [PTT] during data transmission, data trans-
mission is interrupted and voice signals have priority.
D 1200 bps packet operation
q Connect the transceiver and a TNC as illustrated below.
w Set the TNC for transmit.
e Set transmit delay on the TNC.
r Adjust the TNC frequency deviation if necessary.
• When using a deviation meter:
Adjust the output of the TNC so that frequency deviation
is in the range ± 3 to ±4 kHz.
• When NOT using a deviation meter:
A receiver or transceiver is needed to monitor the trans-
mission—compare the received audio output level when
receiving a TNC modulated signal with high level voice
signals using the microphone. Then adjust the TNC mod-
ulated signal to a lower level than the voice modulated
signal.
SQL
PTT
RX AUDIO
GND
TX AUDIO
TNC side
q DATA IN
w GND
e PTT P
t AF OUT
y P SQL
… 86 …


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