ICOM ic-207h Manual De Instrucciónes
14
OTHER FUNCTIONS
66
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 in-
ternal limiter circuitry to automatically maintain band width.
ternal limiter circuitry to automatically maintain band width.
NEVER apply data levels from the TNC of over 0.6 Vp-p, oth-
erwise the transceiver will not be able to maintain the band
width and may possibly interfere with other stations.
erwise 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.
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
0.2 Vp-p–0.5 Vp-p (0.1 Vrms–0.25 Vrms): acceptable level
2. When NOT using a measuring device.
q Connect the IC-207H to a TNC.
w Enter a test mode (“CAL”, etc.) on the TNC, then transmit
q Connect the IC-207H 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 the test data or
transmits sporadically (TX indicator doesn’t appear or
flashes):
flashes):
Decrease the TNC output level until the transmit indicator
lights continuously.
lights continuously.
When transmission is not successful even though the TX
indicator lights continuously:
indicator lights continuously:
Increase the TNC output level.