Yaesu FT-818ND User Manual

37
Transmitter Operation
Packet
(
1200/9600 bps FM
)
Operation
The FT-818 is designed for operation on either 1200 bps or 9600 bps packet, and set-
up is similar to that described previously for SSB-based modes. A separate Data input
adjustment is provided, allowing you to optimize the deviation on the FM Packet modes
separately from the SSB-based Digital modes. The RX-Data output lines are xed-level
outputs, not affected by the setting of the AF Gain control.
1. Connect your TNC to the FT-818’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 nd that the drive level needs no
further adjustment.
5. If you are having trouble connecting due to insufcient or excessive drive from the TNC
to the FT-818, 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-818’s modulator. Remember 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 setting
is usually ±2.75 kHz (±0.25 kHz). For 1200 bps, the optimum level is much less criti-
cal, with the optimum deviation being between ±2.5 kHz and ±3.5 kHz.
GND
KEY DATA ACC
ANT
:
INPUT DC13.8V
PTT
DATA I N
GND
DATA
OUT
DATA
IN
PTT
DATA OUT
(1200bps)
DATA OUT (9600bps)
Pin Label Note
DATA IN
Maximum Input Lebel:
40 mV pp @1200 bps
1.0 V pp @9600 bps
Impedance: 10 kΩ
PTT Ground to Transmit
DATA OUT
9600 bps
Maximum Output Level:
500 mVpp
Impedance: 10kΩ
DATA OUT
1200 bps
Maximum Output Level:
300 mVpp
Impedance: 10kΩ
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Yaesu FT-818ND Specifications

General

Brand	Yaesu
Model	FT-818ND
Category	Transceiver
Language	English