35
Transmitter Operation
4. If the optional
YF-122C
500 Hz filter has been installed, it may be used for RTTY work.
Recall Operating Function Row 7 [IPO, ATT, NAR] then press the
(NAR) key to en-
gage the narrow filter.
5. To set up the transmit side, be sure that the Meter is set to monitor ALC voltage. If not,
press the key momentarily, then rotate the
knob to select to select Operating
Function Row 9 [PWR, MTR], then press the
(MTR) key so as to select metering
of ALC.
6. Press and hold in the key for 1/2 second to enter the
m
enu
mode, then rotate the
knob to select
m
enu #25 (DIG MIC).
7. Following the instructions for your TNC’s software, activate the transmitter from the
computer keyboard; this should cause the AFSK output from the TNC to be sent to the
radio. While transmitting, view the ALC meter; a few “dots” of ALC indication should be
observed. If not, rotate the
knob to adjust the AFSK level. Press and hold in the
key for one second to save the new AFSK level setting and return to normal opera-
tion. You are now ready for RTTY operation.
Because RTTY is a continuous-duty transmission mode, try to keep your transmis-
sion short when running on battery power, so as to minimize current drain.
PSK31 Operation
Two dedicated PSK31 modes are available, one each for USB-side and LSB-side injec-
tion. For BPSK work, the injection does not matter, but for QPSK the two working stations
must use the same sideband.
Connect the
FT-818
to your computer’s sound card or interface.
Setup for PSK31 operation is basically identical to that previously described for RTTY
operation. As before, use the “DIG” mode. However, in Menu #26, select “PSK31-L” (for
LSB injection) or “PSK31-U” (for USB injection). As with RTTY, Menu #25 may be used to
set the drive to the transmitter. And the
YF-122C
500 Hz filter may also be utilized, as de
-
scribed previously.
