Yaesu FT-897D, Руководство по эксплуатации

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Page 39 FT-897D O
PERATING
M
ANUAL
T
RANSMITTER
O
PERATION
PSK31 Operation
Two dedicated PSK31 modes are available, one each for
USB-side and LSB-side injection. For BPSK work, the in-
jection does not matter, but for QPSK the two working sta-
tions must use the same sideband.
Connect the FT-897D to your computer’s sound card or
interface, per thenillustration.
Setup for PSK31 operation is basically identical to that pre-
viously described for RTTY operation. As before, use the
“DIG” mode. However, in Menu Mode
No-038
[
DIG
MODE
]
, select “ PSK31-L ” (for LSB injection) or “ PSK31-
U
” (for USB injection). As with RTTY, Menu #38 may be
used to set the drive to the transmitter. And the
YF-122C
500 Hz filter or YF-122CN 300 Hz filter may also be uti-
lized, as described previously.
“USER” D
EFINED
D
IGITAL
M
ODES
Also provided in the FT-897D are two convenient “USER”
Digital modes, one each providing USB- and LSB-side in-
jection, which may be used for SSTV, Fax, Pactor, and other
digital operating modes.
Here is an example involving the configuration of the USER
mode for JT44 (WSJT) operation with USB-side injection
(as opposed to LSB injection, used in the default “RTTY”
mode):
1. Use Menu Mode No-038
[
DIG MODE
]
to set the Digital
mode to “
USER-U
.”
2. Press the MODE
( )/
MODE
( ) key, as needed, to se-
lect the DIG operating mode (the “ DIG ” icon will appear
on the display).
3. Now use Menu mode to configure the transceiver’s pass-
band response. Once in the Menu mode, rotate the
MEM/
VFO CH knob to select Menu Mode
No-039
[
DIG
SHIFT
]
, and rotate the
DIAL
knob to set the desired BFO
offset. (a center frequency for the receiver response). For
WSJT use, a setting of about “+1500” will be a good
starting point.
4. Finally, depending on how you wish the display to re-
spond, you may program in a corresponding display shift,
using Menu Mode
No-036
[
DIG DISP
]
.
5. Remember to press and hold in the [ F
] key for one sec-
ond when exiting the Menu mode.
The setup of the AFSK drive level is identical to that de-
scribed previously for RTTY operation.
The USER-L and USER-U Digital modes
should allow you to operate on any SSB-based
AFSK Digital mode. Note that the “PSK31”
configurations will also work well for many Digital oper-
ating situations.
D
IGITAL
M
ODE
O
PERATION
(
SSB-B
ASED
AFSK
)
Packet (1200/9600 bps FM) Operation
The FT-897D is designed for operation on either 1200 bps
or 9600 bps packet, and setup is similar to that described
previously for SSB-based modes. A separate Data input ad-
justment is provided, allowing you to optimize the devia-
tion on the FM Packet modes separately from the levels set
for SSB-based Digital modes. The RX-Data
output lines are
fixed-level outputs, not affected by the setting of the AF Gain
control.
1. Connect your TNC to the
FT-897D
’s rear-panel
DATA
jack, per the illustration.
Note that different connections are used for 1200 bps
and 9600 bps Packet.
PT
T
D
AT
A IN
GN
D
DATA
OUT
DATA
IN PTT
DATA OUT
(1200bps)
DA
TA
O
U
T
(9
60
0b
ps
)
2. Use Menu Mode
No-073
[
PKT RATE
] to select the de-
sired Packet mode.
Once you have entered the Menu and have selected Menu
Mode
No-073
[
PKT RATE
] , rotate the DIAL knob to
select either “ 1200 ” or “ 9600 ” (bps) as the Packet rate.
3. Press the MODE
( )/
MODE
( ) key, as needed, to se-
lect the PKT operating mode (the “ PKT ” icon will ap-
pear on the display).
You are now set up for reception on Packet. If you are oper-
ating on 1200 bps, try now to connect to another station or
node; you may well find that the drive level needs no further
adjustment. If, however, you are having trouble connecting
due to insufficient or excessive drive from the TNC to the
FT-897D , use Menu Mode No-071
[
PKT 1200] (for 1200
bps Packet) or
No-072
[
PKT 9600
]
(for 9600 bps Packet)
to set the drive. Use your terminal software’s “test” protocol
to send out test tones, and adjust the deviation by rotating
the
DIAL knob, which will vary the data input level to the
FT-897D
’s modulator. Remember to press and hold in the
[
F
] key for one second when adjustments are completed, so
as to save the new setting for Menu Mode
No-071
[
PKT
1200] or No-072
[
PKT 9600
]
.
The 9600 bps Packet deviation setting is very criti-
cal to successful operation, and it can only be
accomplished using a calibrated deviation meter;
the optimum setting is usually ±2.75 kHz (±0.25 kHz). For
1200 bps, the optimum level is much less critical, with the
optimum deviation being between ±2.5 kHz and ±3.5 kHz.