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Station Installation
In any case, make sure the power supply is
set correctly before connecting power. If you
have any doubts about the procedure, ask your
dealer for help.
You should also make sure the fuse in the
FP-800 rear panel fuse holder is correct for your
mains voltage:
AC Mains Voltage
Fuse Capacity
100- 117
8 A
200
-
234
4 A
After making certain the AC voltage for
which the power supply is set matches your
mains voltage, and that the correct fuse is in-
stalled in the fuse holder, connect the DC cable
from the power supply to the jack on the rear
panel. Don't plug the power supply cord into the
wall until all other transceiver interconnections
have been made.
Transceiver Location
To assure long life of the components, make
sure to provide adequate ventilation around the
cabinet. The cooling system of the FT-890 must
be free to draw cool air in at the bottom rear of
the transceiver, and to expel warm air out of the
upper rear panel. Do not place the transceiver on
top of another heat-generating device such as a
linear amplifier, and do not place equipment,
books or papers on top of the transceiver. Place
the transceiver on a hard, flat surface. Avoid
heating vents and window locations that could
expose the transceiver to excessive direct sun-
light, especially in hot climates.
Grounding
For protection from shock and proper per-
formance, connect the GND terminal on the rear
panel to a good earth ground, using a heavy
braided cable of the shortest length possible. All
other station equipment should be connected to
the same grounding cable, as close together as
practical. If you use a computer with or near the
FT-890, you may need to experiment with
grounding of both the transceiver and the com-
puter to suppress computer noise in the receiver.
Antenna Considerations
Any antenna connected to the FT-890 should
have a coaxial feedline with 5 0 4 impedance,
and include a well-grounded lightning arrestor.
The internal ATU-2 and external FC-800 antenna
tuners are capable of matching antennas with an
SWR of up to 3:1 or more on the amateur bands
to the transmitter. Nevertheless, optimum per-
formance for both reception and transmission
will generally result with an antenna designed to
provide a 50-R unbalanced resistive load at the
operating frequency. An antenna that is not reso-
nant at the operating frequency may present too
high an SWR for proper matching with the an-
tenna tuner, in which case the antenna should be
readjusted, or a wide-range manual antenna
tuner should be used. If the tuner is unable to
bring the SWR down to an acceptable level, at-
tempting to transmit will result in an automatic
reduction in power output and increased losses
in
the feedline. Operation under such conditions
can waste power and cause TVI, RFI and RF
feedback: it is better to install another antenna
designed for that band. Also, if your antenna has
a balanced feedpoint and you use a balanced
feedline, install a balun transformer between the
feedline and the transceiver's antenna jack.
Mobile Power Connection
A fused (20-A) DC power cable for mobile
installation is supplied with the transceiver.
Please note the
Caution
at the beginning of this
chapter before connecting power. Plan to con-
nect the DC cable directly to the vehicle battery,
rather than to the ignition or accessory circuitry.
Route the cable as far away from ignition cables
as possible, and then cut off any extra cable (from
the battery end) to minimize voltage drop losses.
If the cable is not long enough, use
#12
AWG
stranded, insulated wire to extend it, but no
more than is necessary. Use the following proce-
dure to connect the cable:
0 Before connecting the cable, measure the volt-
age across the battery terminals with the en-
gine running fast enough to show a charge. If
above 15 volts, the automobile voltage regula-
tor must be adjusted to reduce the charging
voltage before proceeding.
Adjusting the Front Panel Angle
0
With the radio end of the cable unconnected,
If your installation places the FT-890 much
connect the RED cable lead to the POSITIVE
below eye level, you may want to prop up the
battery terminal, and the BLACK lead to the
front. A wire bail on the bottom of the FT-890 can
NEGATIVE terminal. Make sure the battery
be folded down for this purpose.
terminal connections are tight, and remember
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