Icom IC-2820H Instruction Manual page 142

14
OTHER FUNCTIONS
• 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 find
that many transmissions are failing, re-adjust the modu-
lation level.
125
D 9600 bps high speed packet operation
The transceiver supports 2 modes of 9600 bps packet opera-
tion: G3RUH and GMSK.
q Connect the transceiver and a TNC as illustrated below.
q DATA IN
w GND
e PTT P
y P SQL
w G3RUH mode can handle 16 kinds of modulated wave
forms in order to maintain a communication link.
e Set transmit delay on the TNC to 30–50.
r Adjust the TNC frequency deviation if necessary (see page
at right).
TNC side
TX AUDIO
GND
r DATA OUT
RX AUDIO
PTT
SQL