ICOM IC-7000 说明手册
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116
PACKET OPERATION
■
Packet operation
q
w
e
y
t
r
P
PIIN
N #
#//N
NA
AM
ME
E
D
DE
ES
SC
CR
RIIP
PT
TIIO
ON
N
q D
DA
AT
TA
A IIN
N
Communication data input.
w G
GN
ND
D
Ground for DATA IN, DATA OUT and AF OUT.
Transmits when grounded.
e P
PT
TT
TP
P
When grounded, microphone input (pin 6) of [MIC]
connector will be disconnected.
connector will be disconnected.
r D
DA
AT
TA
A O
OU
UT
T
Outputs 9600 bps receive data.
t A
AF
F O
OU
UT
T
Outputs 1200 bps receive data.
y S
SQ
QL
L
Squelch output.
Goes to ground when squelch opens.
Goes to ground when squelch opens.
Rear panel view
D
Adjusting the data speed
q Select M
M--3
3.
w Push
[F-4
9
96
60
00
0
]
to select the 9600 baud mode
ON and OFF.
•
“
”
appears when the 9600 baud mode is acti-
vated.
[MENU/GRP]
[F-4]
D
Adjusting the transmit signal output from the TNC
When setting data transmission speed to 9600 baud
bps, the data signal coming from the TNC is applied
exclusively to the internal limiter circuitry to automati-
cally maintain bandwidth.
bps, the data signal coming from the TNC is applied
exclusively to the internal limiter circuitry to automati-
cally 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.
maintain the band width and may possibly interfere
with other stations.
NOTE:
Read the instructions supplied with your
TNC carefully before attempting packet operation
with the IC-7000.
with the IC-7000.
1. When using a level meter or oscilloscope, adjust
the TX audio level (DATA IN level) from the TNC as
follows.
0.4 Vp-p (0.2 Vrms): recommended level
0.2–0.5 Vp-p (0.1–0.25 Vrms): acceptable level
follows.
0.4 Vp-p (0.2 Vrms): recommended level
0.2–0.5 Vp-p (0.1–0.25 Vrms): acceptable level
2. When not using a measuring device.
q Connect the IC-7000 to a TNC.
w Enter a test mode (“CAL”, etc.) on the TNC, then
q Connect the IC-7000 to a TNC.
w Enter a test mode (“CAL”, etc.) on the TNC, then
transmit some test data.
e
When the transceiver fails to transmit test data or
transmits sporadically ([TX] indicator doesn’t light
red or blinks):
transmits sporadically ([TX] indicator doesn’t light
red or blinks):
- Decrease the TNC output level until
[TX]
indica-
tor lights red continuously.
When transmission is not successful even though
[TX] indicator lights red continuously:
[TX] indicator lights red continuously:
-
Increase the TNC output level.
D
Data socket
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