Yaesu FT-100D Operating Manual page 22

Installation
ACCESSORY INTERFACING
AFSK TNC Connections (for
RTTY,
Packet, etc.)
The FT-100 is easy to connect to most all Terminal Node Controllers (TNCs) or other
digital modem units used for RTTY, HF Packet, and other digital modes which utilize USB
or LSB as the fundamental operating mode.
Audio Frequency-Shifted Keying (AFSK) operation for HF Baudot, AMTOR, 300 bps
Packet, etc. is provided via the rear-panel DATA jack. Pin 1 of this jack accepts AFSK
input from the TNC's "TX Audio" line. Pin 3 is used for PTT control (the TNC closes this
line to ground to cause the FT -100 to transmit). Pin
S
is used for "RX Audio" which is sent
to the TNC for decoding. Pin 2 is used for Ground for all lines.
The optimum levels/impedances are shown below:
Pin 1 (Data In): 40 mV@ 10 kQ
Pin S (Data Out): 300 m V @ 10 kQ
When operating on AFSK, the microphone is automatically disconnected when the radio's
microprocessor detects PTT control from the DATA jack. Therefore, it is not necessary to
disconnect the microphone during digital mode operation.
Typical interconnection information is presented below.
For operation on RTTY, HF Packet, etc., several Menu selections must be set appropri-
ately. These include:
MENU
#21 (HF TX PO):
MENU
#28 (AFSK LEVEL):
MENU
#34 (AFSK MODE):
MENU
#35 (RTTY SHIFT):
MENU
#36 (RTTY DISPL V):
Set to SOW after adjusting AFSK Level (see page 88)
Set for 4 "dots" of ALC indication (see page 89)
Set for desired mode
Set to match shift set in your TNC
Set for offset or non-offset frequency display
Details regarding these and other MENU settings may be found beginning on page 82.
FT-100 AFSK TNC
Personal Computer
D
E!
RS-232C
20 FT-JOO
MICRO MOBILE OPERATING MANUAL