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41
FT-817
ND
Operating Manual
P
ACKET
(
1200/9600
BPS
FM
)
O
PERATION
The
FT-817
ND
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 adjust-
ment is provided, allowing you to optimize the deviation on the FM Packet modes sepa-
rately from the SSB-based Digital modes. The RX-Data output lines are fixed-level out-
puts, not affected by the setting of the AF Gain control.
1. Connect your TNC to the
FT-817
ND
’s rear-panel
DATA
jack, per the illustration. Note
that different connections are used for 1200 bps and 9600 bps Packet.
2. Use Menu #40 (
PKT RATE
) to select the desired Packet mode. Once you have entered
the Menu and have selected Menu #40, rotate the
knob to select either “
1200
”
or “
9600
” (bps) as the Packet rate.
3. Press the
/
key, as needed, to select the PKT mode (the “
PKT
” icon
will appear on the display).
4. You are now set up for reception on Packet. If you are operating on 1200 bps, try now to
connect to another station or node; you may well find that the drive level needs no
further adjustment.
5. If you are having trouble connecting due to insufficient or excessive drive from the
TNC to the
FT-817
ND
, use Menu #39 (
PKT MIC
) to set the drive. Use your terminal
software’s “test” protocol to send out test tones, and adjust the deviation by rotating the
knob, which will vary the data input level to the
FT-817
ND
’s modulator. Remem-
ber to press and hold in the
key for one second when adjustments are completed, so
as to save the new setting for Menu #39.
The 9600 bps Packet deviation setting is very critical to successful operation, and
it can only be accomplished using a calibrated deviation meter; the optimum set-
ting 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.
T
RANSMITTER
O
PERATION
Note
Maximum Input Lebel: 40 mV pp @1200 bps
1.0 V pp @9600bps
Impedance: 10 k
Ω
Ground to Transmit
Maximum Output Level: 500 mVpp
Impedance: 10k
Ω
Maximum Output Level: 300 mVpp
Impedance: 10k
Ω
SQL Open: +5V
SQL Closed: 0V
Pin Label
DATA IN
PTT
DATA OUT
9600 bps
DATA OUT
1200 bps
SQL
Содержание FT-817ND
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