Accessory Interfacing - Yaesu FT-100D Operating Manual

Installation
ACCESSORY INTERFACING
The FT -100 may be connected to a wide variety of accessories in your amateur station,
whether you're at home or away. Due to the compact size of the FT-IOO, many of the rear-
panel connectors are used for more than one purpose. The sections to follow will describe
the interfacing procedures.
Linear Amplifier Interfacing
The FT -100 provides the switching and drive-control lines required for easy interfacing to
most all commonly-available amplifiers sold today.
These include:
o
The Antenna Cable Pigtails (#1 and #2);
o
A T/R control line (open circuit on RX, closure to ground on TX); and
o
A negative-going ALC jack (control voltage range: OV to -4 V DC).
o
When interfacing to the VL-I 000 Solid State 1 K W Linear Amplifier, the optional
CT -58 Interface Cable provides for easy interconnection.
The rear-panel ACC jack is a miniature stereo type, which accepts ALC control voltage
input on the tip connection, and T/R control on the ring connection. The main shaft is used
for the ground connection.
Typical amplifier interface circuits are shown below.
Note that some amplifiers, particularly VHF or UHF "brick" amplifiers, offer two methods
ofT/R switching: application of + 13V or a closure to ground.
Be sure to configure your amplifier so that it switches via a closure to ground, as provided
by your FT -100. Alternatively, many of these amplifiers use "RF Sensing" to control their
relays; if yours is not in this category, you may then use the T/R control line from the ring
of the ACC jack for control of your HF linear amplifier, if desired.
The T/R control line is a transistor "open collector" circuit, capable of handling positive
amplifier relay coil voltages of up to +50V DC and current of up to 400 rnA. If you plan on
using multiple linear amplifiers for different bands, you must provide external band-switch-
ing of the
"LIN
Tx" relay control line from the "ring" connection of the ACC jack
18
Important Note!
Do not exceed the maximum voltage or current ratings for the ACC jack. This jack
is not compatible with negative DC voltages, nor AC voltages of any magnitude.
Most amplifier control relay systems require only low DC voltage/current switch-
ing capability (typically, + 12V DC at 25
~
75 rnA), and the switching transistor in
the FT -100 will easily accommodate such amplifiers.
FT-100
MICRO MOBILE OPERATING MANUAL