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
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General
Weight and Dimensions
