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INSTALLATION
The AT-897Plus tuner is designed for indoor operation only; it is not water resistant. If you
use it outdoors (Field Day, for example), you must protect it from the rain. The AT-897Plus is
designed for use with coax-fed antennas. If use with longwires or ladder-line-fed antennas is
desired, an external balun is required. The LDG RBA-4:1 or RBA-1:1 is ideal, depending on the
antenna and transmission line used.
Always turn your radio off
before plugging or unplugging anything. The radio may be
damaged if cables are connected or disconnected while the power is on.
Compatible Transceivers
The AT-897Plus is designed to be used ONLY with the following two Yaesu 100 watt
transceivers:
•
FT-897
•
FT-897D
•
For the FT-857 and FT-857D, use the YT-100 tuner.
WARNING: Do not attempt to use the AT-897Plus with any other transceivers, even if the
CAT plug fits. At best, the AT-897Plus simply won’t work with these radios. At worst, it could
cause damage to the AT-897Plus, the radio, or both.
Mounting the AT-897Plus to the FT-897 Radio
The AT-897Plus tuner is designed to be integrated with the FT-897 transceiver by mounting
it to the left side of the transceiver. Mounting is not required, but if it is desired to mount the
tuner to the left side of the radio, no modifications to the radio are needed.
Mounting the tuner to the radio requires a small Phillips (cross-point) screwdriver, preferably
one with a magnetized tip. If a magnetized-tip screwdriver is not available, tweezers may be
need to aid in positioning the mounting screws.
Use of a grounded anti-static mat or wrist strap is best, but if these are not available, be sure
to periodically touch a grounded device, such as a light switch, to avoid static buildup.
Mounting is performed as follows:
1.Turn off the FT-897 and disconnect all cables from the AT-897Plus. Disconnect the FT-
897 from its power source, including the internal batteries, if they are installed.
2.Looking at the front of the FT-897, remove the four plastic feet from the left side of the
radio. Carefully set these aside; they will be re-installed later.
3.Remove the cover of the AT-897Plus tuner by removing the four screws on the top and
bottom of the tuner. Also set these aside; they will be reinstalled later. Lift off the cover.
During the remainder of the mounting procedure, the internal circuitry of the AT-897Plus is
exposed; take care not to damage the circuitry.
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