Packet (1200/9600 bps FM) Operation. YAESU FT-817nd

T

RANSMITTER

O

PERATION

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 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 fixed-level outputs, 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 or “

9600

” (bps) as the Packet rate.

knob to select either “ 1200 ”

3. Press the / will appear on the display).

key, as needed, to select the PKT mode (the “ PKT ” icon

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. 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 critical, with the optimum deviation being between ±2.5 kHz and ±3.5 kHz.

Pin Label

DATA IN

PTT

DATA OUT

9600 bps

DATA OUT

1200 bps

SQL

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

FT-817

ND

Operating Manual 41