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39FT-817ND Operating Manual
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 engage 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 MENU mode, then rotate the
knob to select Menu #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
operation. You are now ready for RTTY operation.
Because RTTY is a continuous-duty transmission mode, try to keep your transmission
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 injection.
For BPSK work, the injection does not matter, but for QPSK the two working stations must
use the same sideband.
Connect the FT-817ND 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
described previously.
TRANSMITTER OPERATION
DIGITAL MODE OPERATION
(
SSB-BASED AFSK
)
41


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