79
10
DATA COMMUNICATION
2001 NEW
■ Adjusting the TNC output level
When setting data transmission speed to 9600 bps,
the data signal coming from the TNC is applied exclu-
sively to the internal limiter circuitry to automatically
maintain band width.
NEVER apply data levels from the TNC of over 0.6 V
p-p, otherwise the transceiver will not be able to main-
tain the band width and may possibly interfere with
other stations.
DD
Using with a level meter or synchroscope
When using a level meter or synchroscope, adjust the
TX audio output level (DATA IN level) from the TNC as
follows.
0.4 V p-p (0.2 Vrms) : recommended level
0.2–0.5 V p-p (0.1–0.25 Vrms) : acceptable level
DD
Not using a measuring device
q Connect the transceiver to a TNC. (p. 77)
w Enter a test mode (“CAL,” etc.) on the TNC, then
transmit some test data.
e When the transceiver fails to transmit the test data
or transmits sporadically (TX indicator doesn’t light
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.
■ Data transmission speed
For data communication (in FM mode), the transceiver
can be set to to a maximum data speeds of 9600 bps
(or less; 1200, 2400 or 4800 bps).
q Push [MENU] for 1 sec. to enter set mode.
w Push [F1 ≤] or [F2 ≥] to select the 9600bps
Mode item.
e Rotate the tuning dial to turn the 9600 bps mode ON
and OFF.
ON : 9600 bps of data speed
OFF : 1200, 2400 or 4800 bps of data speed
(default)
r Push [MENU] to return to previous indication.
21
ON
96OObps
Mode
21
OFF
96OObps
Mode
Select with the tuning dial
IC-7400.qxd 02.4.2 11:35 Page 79
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