Packet (1200/9600 Bps Fm) Operation - Yaesu FT-817ND Operating Manual

P
ACKET
The FT-817 is designed for operation on either 1200 bps or 9600 bps packet, and setup
ND
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
that different connections are used for 1200 bps and 9600 bps Packet.
2. Use Menu #40 (PKT RATE
the Menu and have selected Menu #40, rotate the
or "9600 9600" (bps) as the Packet rate.
9600 9600
9600
3. Press the
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
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
ber to press and hold in the
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.
Pin Label
DATA IN Maximum Input Level: 40 mV pp @1200 bps
Impedance: 10 kΩ
PTT Ground to Transmit
DATA OUT Maximum Output Level: 500 mVpp
9600 bps Impedance: 10kΩ
DATA OUT Maximum Output Level: 300 mVpp
1200 bps Impedance: 10kΩ
SQL SQL Open: +5V
SQL Closed: 0V
FT-817 Operating Manual
ND
T
RANSMITTER
( 1200/9600
ND
PKT RATE) to select the desired Packet mode. Once you have entered
PKT RATE PKT RATE PKT RATE
/ key, as needed, to select the PKT mode (the "PKT
, use Menu #39 (PKT MIC
ND
key for one second when adjustments are completed, so
Note
1.0 V pp @9600bps
FM ) O
BPS
's rear-panel DATA jack, per the illustration. Note
PKT MIC) to set the drive. Use your terminal
PKT MIC PKT MIC
PKT MIC
O
PERATION
PERATION
knob to select either "1200
's modulator. Remem-
ND
1200 1200
1200" 1200
PKT" icon
PKT PKT PKT
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