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D Adjusting the transmit signal output from
the TNC
When setting data transmission speed to 9600 bps, the data
signal coming from the TNC is applied exclusively 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 maintain the
band width and may possibly interfere with other stations.
1. When using a level meter or oscilloscope, adjust the
TX audio output level (DATA IN level) from the TNC as
follows.
0.4 V p-p (0.2 V rms)
0.2 V p-p–0.5 V p-p (0.1–0.25 V rms)
2. When NOT using a measuring device.
q Connect the transceiver to a TNC.
w Enter a test mode ("CALL", 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 appear 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.
: recommended level
: acceptable level
13
OTHER FUNCTIONS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
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