ICOM IC-706MKIIG 用户手册
37
4
RECEIVE AND TRANSMIT
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Rear panel
DATA
PTT
PTTP
DATA IN
SQL
RX AUDIO
GND
TX AUDIO
TNC SIDE
TU or TNC
RS-232C
Personal computer
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AF OUT
DATA OUT
GND
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A IIN
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Communication data input.
w G
GN
ND
D
Ground for DATA IN, DATA OUT and AF OUT.
e P
PT
TT
TP
P
Transmits when grounded.
r D
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Outputs 9600 bps receive data.
t A
AF
F O
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Outputs 1200 bps receive data.
y S
SQ
Q
Squelch output.
Goes to ground when squelch opens.
Rear panel view
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E:: For packet operation the transceiver can
be set to one of two data speeds: 1200 bps or
9600 bps. Data speed is set in initial set mode (see
p. 54 item 29 9600 MODE).
9600 bps. Data speed is set in initial set mode (see
p. 54 item 29 9600 MODE).
Data speed is set in initial set mode (see p. 53 item 29
9600 MODE).When setting data transmission
speed to 9600 bps, the
9600 MODE).When setting data transmission
speed to 9600 bps, the
DATA
signal coming from the
TNC is applied exclusively to the internal limiter cir-
cuitry to automatically maintain bandwidth.
NEVER apply data levels from the TNC of over 0.6
Vp-p, otherwise the transceiver will not be able to
maintain the band width and may possibly interfere
with other stations.
cuitry to automatically maintain bandwidth.
NEVER apply data levels from the TNC of over 0.6
Vp-p, otherwise the transceiver will not be able to
maintain the band width and may possibly interfere
with other stations.
☞ N
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E:: Read the instructions supplied with your
TNC carefully before attempting packet operation
with the IC-706MKIIG.
with the IC-706MKIIG.
1. When using a level meter or synchroscope, adjust
the TX audio level (
DATA IN
level) from the TNC as
follows.
0.4 Vp-p (0.2 Vrms): recommended level
0.2 Vp-p–0.5 Vp-p (0.1 Vrms–0.25 Vrms):
acceptable level
0.2 Vp-p–0.5 Vp-p (0.1 Vrms–0.25 Vrms):
acceptable level
2. When not using a measuring device.
➀
Connect the IC-706MKIIG to a TNC.
➁
Enter a test mode (“CAL”, etc.) on the TNC, then
transmit some test data.
transmit some test data.
➂
When the transceiver fails to transmit test data or
transmits sporadically (TX indicator doesn’t appear
or flashes):
transmits sporadically (TX indicator doesn’t appear
or flashes):
Decrease the TNC output level until the transmit
indicator lights continuously.
When transmission is not successful even though
the TX indicator lights continuously:
Increase the TNC output level.
indicator lights continuously.
When transmission is not successful even though
the TX indicator lights continuously:
Increase the TNC output level.
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IC-706MKIIG.qxd 02.3.27 13:53 Page 37