Icom IC-207H - Page 77

) eee 535555
)
)
| Adjusting the transmit signal output from
the TNC
hen setting data transmission speed to 9600 bps, the DATA
ynal coming from the TNC is applied exclusively to the in-
mal limiter circuitry to automatically maintain band width.
=VER apply data levels from the TNC of over 0.6 Vp-p, oth-
wise the transceiver will not be able to maintain the band
dth and may possibly interfere with other stations.
When using a level meter or synchroscope, adjust the TX
audio output level (DATA IN level) from the TNC as follows.
0.4 Vp-p (0.2 Vrms): recommended level
0.2 Vp-p—0.5 Vp-p (0.1 Vrms—0.25 Vrms): acceptable level
When NOT using a measuring device.
Connect the IC-207H to a TNC.
‘Enter a test mode (“CAL’”, etc.) on the TNC, then transmit
some test data.
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.
OTHER FUNCTIONS 14
ENGLISH