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Automatic Antenna Tuner FC-50
Installation Instructions
Thank you for your purchase of the model FC-50 Automatic Antenna Tuner. The FC-50 is designed specifically for
the FT-891 HF/VHF Transceiver. A cooling fan is incorporated in the tuner to ensure thermal stability of the critical
matching elements mounted within the compact case.
The FC-50 Automatic Antenna Tuner responds to control commands from the FT-891 Transceiver, providing
microprocessor-based impedance matching on the 160 through 6 meter Amateur bands. On the HF bands the
impedance matching range is from 16 Ω to 150 Ω (up to 3:1 SWR) and on the 50 MHz band the impedance
matching range is from 25 Ω to 100 Ω (up to 2:1 SWR). Accordingly, the FC-50 should not be expected to match “long
wire” type antennas unless specific design steps are taken to ensure that the impedance presented to the FC-50 is
within these specifications.
Please refer to the FT-891 Operating Manual for operating instructions.
The FC-50 tuner can be activated during receive (refer to "Activate the tuner during receive" on page three of these
instructions).
Front & Rear Panel Information
The ventilator
air intake ducts
are for cooling.
Do not place any
objects that restrict
air flow near the
ducts.
Connect the Control Cable
from the FT-891 to this
miniature DIN connector.
Use this “M” type
( “SO-239” ) jack
for connection of
the coaxial cable
from the FT-891.
This “M” type
(“SO-239”) coaxial
jack accommo-
dates the antenna
input for the FC-50.
The ventilator air intake ducts
are for cooling. Do not place any
objects that restrict air flow near
the ducts.
Front Side
Rear Side
Installation to the FT-891
1. Referring to the figure below, remove the four feet and reattach the feet on the bottom of the transceiver with
the supplied screws
A (M3x8B) (use a screwdriver).
Do not attach any parts other than the supplied mounting parts .
2. Remove the four rubber caps on the top case of the FC-50.
3. Slide FT-891 with the supplied feet toward the rear of the FC-50, into the slots from which the rubber caps were
removed in step (2) above.
Replace the feet on the
bottom of the transceiver
with the supplied feet.
Slide FT-891
forward into the
slots of FC-50.
Attach the supplied
feet.
A
When installing the FC-50 and the FT-891 separately, purchase an additional Mobile Mounting
Bracket(MMB-82), and mount both units securely.
