Icom IC-7000 Instruction Manual - Page 125

Packet Operation

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11 PACKET OPERATION ■ Packet operation D Data socket qw e r t y Rear panel view PIN #/NAME DESCRIPTION q DATA IN Communication data input. w GND Ground for DATA IN, DATA OUT and AF OUT. Transmits when grounded. e PTT P When grounded, microphone input (pin 6) of [MIC] connector will be disconnected. r DATA OUT Outputs 9600 bps receive data. t AF OUT Outputs 1200 bps receive data. y SQL Squelch output. Goes to ground when squelch opens. D Adjusting the data speed q Select M-3. w Push [F-4 9600] to select the 9600 baud mode ON or OFF. • " " a p p e a r s w h e n t h e 9 6 0 0 b a u d m o d e i s activated. [MENU/GRP] [F-4] 10 11 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 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. NOTE: Read the instructions supplied with your TNC carefully before attempting packet operation 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 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 transmit some test data. e W hen the transceiver fails to transmit test data or transmits sporadically ([TX] indicator doesn't light red or blinks): - Decrease the TNC output level until [TX] indicator lights red continuously. When transmission is not successful even though [TX] indicator lights red continuously: - Increase the TNC output level. 116

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11
116
PACKET OPERATION
■
Packet operation
q
w
e
y
t
r
PIN #/NAME
DESCRIPTION
q
DATA IN
Communication data input.
w
GND
Ground for DATA IN, DATA OUT and AF OUT.
Transmits when grounded.
e
PTT P
When grounded, microphone input (pin 6) of [MIC]
connector will be disconnected.
r
DATA OUT
Outputs 9600 bps receive data.
t
AF OUT
Outputs 1200 bps receive data.
y
SQL
Squelch output.
Goes to ground when squelch opens.
Rear panel view
D
Adjusting the data speed
q
Select
M
-
3
.
w
Push
[F-4
9600
]
to select the 9600 baud mode
ON or OFF.
•
“
”
appears when the 9600 baud mode is
activated.
[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
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.
NOTE:
Read the instructions supplied with your
TNC carefully before attempting packet operation
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
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
transmit some test data.
e
When the transceiver fails to transmit test data or
transmits sporadically (
[TX]
indicator doesn’t light
red or blinks):
- Decrease the TNC output level until
[TX]
indicator lights red continuously.
When transmission is not successful even though
[TX]
indicator lights red continuously:
-
Increase the TNC output level.
D
Data socket
10
11