Packet Operation; D Data Socket; D Adjusting The Data Speed; D Adjusting The Transmit Signal Output From The Tnc - Icom IC-7000 Instruction Manual

D
Rear panel view
D
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]
D
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.
PIN #/NAME
q DATA IN
w GND
e PTT P
r DATA OUT
t AF OUT
y SQL
[F-4]

PACKET OPERATION

DESCRIPTION
Communication data input.
Ground for DATA IN, DATA OUT and AF OUT.
Transmits when grounded.
When grounded, microphone input (pin 6) of [MIC]
connector will be disconnected.
Outputs 9600 bps receive data.
Outputs 1200 bps receive data.
Squelch output.
Goes to ground when squelch opens.
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.
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