Mobile Power Connections
To minimize voltage drop and avoid blowing the vehicle’s fuses, connect the
supplied DC power cable directly to the battery terminals. Do not attempt to defeat
or bypass the DC cable’s fuse—it is there to protect you, your transceiver, and
your vehicle’s electrical system.
Warning!
Never apply AC power to the power cable of the FT-90R, nor DC voltage
greater than 15.8 Volts. When replacing the fuse, only use a 15-A fast-
blow type. Failure to observe these safety precautions will void the Lim-
ited Warranty on this product.
r Before connecting the transceiver, check the voltage at the battery terminals
while revving the engine. If the voltage exceeds 15 Volts, adjust the vehicle’s
voltage regulator before proceeding with installation.
r Connect the RED power cable lead to the POSITIVE (+) battery terminal, and
the BLACK power cable lead to the NEGATIVE (-) terminal. If you need to
extend the power cable, use #12 AWG or larger insulated, stranded copper
wire. Solder the splice connections carefully, and wrap the connections thor-
oughly with insulating electrical tape.
r Before connecting the cable to the transceiver, verify the voltage and polarity
of the voltage at the transceiver end of the DC cable using a DC voltmeter.
Now connect the transceiver to the DC cable.
Mobile Speakers
The optional SP-7 or MLS-100 External Speakers include their own swivel-type
mounting brackets, and are available from your Yaesu dealer.
Other external speakers may be used with the FT-90R, if they present the speci-
fied 4-16 Ω impedance and are capable of handling the 2 Watts of audio output
supplied by the FT-90R.
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