Installing The Radio; Antenna Considerations; About Coaxial Cable; Connection Of Antenna And Power Cables - Yaesu FT-891 Operating Manual

Installing the Radio

Antenna considerations

The FT-891 is designed for 50 Ohm resistive impedance at the amateur operating frequencies.
Select the proper antenna ( dipole antenna, YAGI antenna, cubical quad antenna, etc. ) suitable
for the chosen operation and bands.
Construct the antenna and coaxial cable, or use a suitable antenna tuner, to maintain the impedance
presented to the FT-891 antenna connector for an SWR of 1.5 or less. Careful preparation of the
antenna and/or tuner will permit maximum performance and protect the transceiver from damage.
High voltages may be present on the antenna; install it so it will not be easily touched when in
operation.
r Create a loop ( slack ) in the co-axial cable directly underneath the antenna and fasten it so that the
weight of the cable does not pull on the antenna or connector itself.
r Install the antenna taking into consideration the securing supports and how the guying wires are
positioned, so that the antenna does not fall over or get blown away in strong winds.

About coaxial Cable

Us
e high-quality 50-Ohm coaxial cable for the lead-in to your FT-891 transceiver.

Connection of Antenna and Power Cables

Please follow the outline in the illustration regarding the proper connection of antenna coaxial cables.
To prevent damage from lightning, atmospheric
electricity, electrical shock etc., please provide a good
earth ground. Use a short, thick, braided cable to
connect your station equipment to the buried ground rod (or
alternative earth ground system).
GND

Important precautions for mobile radio operation

r The use of protective tape or covering is recommended to protect the wiring and the power cord
inside the vehicle.
r When installing the unit inside a vehicle, locate the radio, antenna, co-axial cable, etc. at least 20
cm ( 8 inches ) away from the following control equipment:
●Engine-related: Fuel injection equipment and engine control
●Transmission-related: Transmission and 4WD electronic control unit
●Others: ECS/EPS/ABS/ETACS/Fully automatic air-conditioner/Auto-heater control unit/G sensor
6
ANTENNA
Use an external power source capable of
supplying DC 13.8 V, a current capacity of
23 A or more.
RED
FUSE: 25 A
FT-891 Operating Manual
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