Operation Manual

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PACKET OPERATION
■ Packet operation
q
w
e
y
t
r
PPIINN ##//NNAAMMEE DDEESSCCRRIIPPTTIIOONN
q
DDAATTAA IINN
Communication data input.
w
GGNNDD
Ground for DATA IN, DATA OUT and AF OUT.
Transmits when grounded.
e
PPTTTTPP
When grounded, microphone input (pin 6) of [MIC]
connector will be disconnected.
r
DDAATTAA OOUUTT
Outputs 9600 bps receive data.
t
AAFF OOUUTT
Outputs 1200 bps receive data.
y
SSQQLL
Squelch output.
Goes to ground when squelch opens.
Rear panel view
D Adjusting the data speed
q Select
MM -- 33
.
w Push [F-4
99660000
] 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.
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] indica-
tor lights red continuously.
When transmission is not successful even though
[TX] indicator lights red continuously:
- Increase the TNC output level.
D Data socket
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