Icom IC-2820H Instruction Manual - Page 141

bps packet operation

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D 1200 bps packet operation q Connect the transceiver and a TNC as illustrated below. q DATA IN TNC side TX AUDIO w GND GND e PTT P y P SQL t AF OUT RX AUDIO PTT SQL w Set the TNC for transmit. e Set transmit delay on the TNC to 50-100 msec., if avail- able. 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 transmission-compare the received audio output level when receiving a TNC modulated signal with high level voice signals using the microphone. Then adjust the TNC modulated signal to a lower level than the voice modulated signal. OTHER FUNCTIONS 15 1 2 • Read the instructions supplied with your TNC carefully 3 before attempting packet operation with the transceiver. • Pin t AF OUT is for 1200 bps operation only. This pin 4 cannot be used for 9600 bps operation. • Over modulation may degrade signal quality. If you find 5 that many transmissions are failing, re-adjust the modu- 6 lation level. 7 8 9 10 11 12 13 14 15 16 17 18 19 120

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120
15
OTHER FUNCTIONS
1
2
3
4
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6
7
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10
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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 to 50–100 msec., if avail-
able.
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.
• Read the instructions supplied with your TNC carefully
before attempting packet operation with the transceiver.
• Pin
t
AF OUT is for 1200 bps operation only. This pin
cannot be used for 9600 bps operation.
• Over modulation may degrade signal quality. If you
fi
nd
that many transmissions are failing, re-adjust the modu-
lation level.
SQL
PTT
RX AUDIO
GND
TX AUDIO
TNC side
q
DATA IN
w
GND
e
PTT P
t
AF OUT
y
P SQL