DAdjusting 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 in- ternal limiter circuitry to automatically maintain band width.

NEVER apply data levels from the TNC of over the accept- able level below, 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 synchroscope, adjust the TX audio output level (DATA IN level) from the TNC as follows.

2

Vp-p (1 Vrms)

: recommended level

1

Vp-p–3 Vp-p (0.5–1.5 Vrms)

: acceptable level

2.When NOT using a measuring device. q Connect the transceiver to a TNC.

w Enter a test mode (“CAL,” etc.) on the TNC, then trans- mit 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 indi- cator lights continuously.

When transmission is not successful even though the TX indicator lights continuously:

- Increase the TNC output level.

OTHER FUNCTIONS 11

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Image 89
Icom IC-208H instruction manual Adjusting the transmit signal output from TNC, Increase the TNC output level