Connection Of Antenna And Power Cables; About Antenna - Yaesu FT-891 Operating Manual

Connection of Antenna and Power Cables

Please follow the outline in the illustration regarding the proper connection of antenna coaxial cables,
as well as the DC power cable.
High current is carried during transmissions. The DC power supply cable must connect directly to the
negative ground, 12 V car battery.
ANTENNA
r Use the transceiver only in a car with a negative ground 12 V DC system, where the minus ( - ) pole
of the battery is connected to the car body.
r Do not connect the radio to the 24 V battery of a large vehicle.
r Do not use a DC power cable other than the one that is supplied or specified.
r High current is carried during transmissions; do not use the cigarette lighter connector inside the
car as a power source.
High RF voltage is present in the TX RF section of the transceiver while transmitting.
Absolutely! Do not touch the TX RF section while transmitting.
Permanent damage can result when improper supply voltage, or reverse polarity voltage,
is applied to the FT-891. The Limited Warranty on this transceiver does not cover damage
caused by application of AC voltage, reverse polarity DC, or DC voltage outside the specified
range of 13.8 V ±15 %. When replacing fuses, be certain to use a fuse of the proper rating.
The FT-891 requires a 25 Amp blade fuse.

About Antenna

The FT-891 is designed for 50 Ohm resistive impedance at the amateur operating frequencies.
Select the proper antenna, suitable for the chosen operation and bands. 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.
FT-891 Operating Manual
Installing the Radio
Fuse holder
FUSE: 25 A
DC power supply
Red
DC 12 V battery
cable (supplied)
Black
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