Yaesu FT-100D Operating Manual page 23

Installation
ACCESSORY INTERFACING
FM Packet TNC Interfacing
The rear-panel DATA jack is also used for connections to a TNC for FM Packet work. The
FM Packet connections are in accordance with a standard adopted by many Amateur-
product manufacturers. However, we recommend that you verify the connections to any
cable you may already own by comparing it to the pictorial below.
The FT-lOO's DATA jack connections are optimized for the data transmission and recep-
tion speed in use. In accordance with the aforementioned industry standards, the signal
levels, impedances, and bandwidths are significantly different on 9600 bps as opposed to
1200 bps. If your TNC does not provide multiple lines to accommodate such optimization,
you may still be able to utilize your TNC if it is designed for multiple-radio use; connect
the TNC "Radio 1" port to the 1200 bps lines on the FT -100, and the "Radio 2" port to the
9600 bps lines.
For ease in making connections to your packet
TNC, the optional CT -39 Packet Cable is avail-
able from your Yaesu dealer. With reference to
the "DATA Jack Pin Connections" chart and
the DATA jack pinout on page 4, you may con-
nect your TNC in minutes using the color-coded
information provided.
Most modem TNCs use a PLL-type DCD (Data
Carrier Detect) circuit, so you will generally not
need to connect anything to the Squelch Con-
trolline (Pin 6) ofthe DATAjack.
Pin
1
2
3
4
5
6
DATA Jack Pin Connections
Label
NQI"
Packet Data Input
Impedance: 10 kn
PKD Max. Input level:
40 mV pp @ 1200bps
2.0 V pp @ 9600bps
GND Signal Ground
PTT Ground on Transmit
9600bps Packet Data Out
RX9600
Impedance: 10 kn
Max. Output level: 500 mV pp
1200bps Packet Data Out
RX1200 Impedance: 10 kn
Max. Output level: 300 mV pp
Squelch Control
Sal Squelch Open +5V
Squelch Closed OV
Note that 9600 bps packet transmit-deviation adjustment is very critical to successful op-
eration, and can only be accomplished using a calibrated deviation meter (such as that
FT-100 FM Packet TNC Personal Computer
D
El
FT-100
MICRO MOBILE OPERATING MANUAL
21