3
Activate the tuner during receive
By configuring the internal DIP switches, the RF signal path may be changed to enable the tuner on both receive
and transmit.
Remove case
1. Turn the FT-891 POWER switch OFF and Remove all cables that are connected to the FC-50.
2. Turn FC-50 upside down.
3. Remove the 8 screws securing the case of the FC-50, and then remove the bottom case
(Figure A).
4. Remove the 2 screws
*1
securing the top case of the FC-50, and then remove the top case.
Activate the tuner during receive
Do not activate the tuner for receive during cross-band operation. If the difference in frequency between TX and RX is more than
100 kHz, the receive signals will be degraded.
1. Turn the FT-891 POWER switch OFF.
2. Remove the 10 screws securing the case of the FC-50, and then remove the top case
(Figure A)
.
3. Move the 8th DIP switch toward the rear of the FC-50 circuit board (use a pin)
(Figure B)
.
4. Replace the case, using the 10 screws removed in step (2) above.
8th position switch
(Activating the Tuner)
Front Side
Rear Side
*1
Do not over
tighten the
2 screws
*1
into the plastic
top case.
Top Case
*1
Bottom
Case
Figure A
Figure B (inside of the top case)
Cautions
● Note the default positions of the internal DIP switch components. All switches on the circuit board, except for the 8th switch,
are for factory setup use only, and they should not be touched.
● Switch the FC-50 OFF before connecting the cables to the transceiver.
● If the FC-50 does not tune when the FT-891 tuner operation is started, there may be a serious antenna or coaxial cable
problem (very high or low impedance due to an “open” or “short”). Please check the antenna and coax if this happens.
● Do not place any objects near the FC-50 ventilator ducts.
● It is normal to hear the sound of the relays while tuning is in progress.
●
Depending on the installation and location of some antennas,
it may not be possible to tune to a low SWR.
● Do not operate the FC-50 and the FT-891 in a place with intense vibration.
Supplied Accessories
Coaxial Cable (0.5 m)
..........................................1
Control Cable (0.5 m)
..........................................1
Feet attached on the bottom of the FT-891 .........4
Screws A(M3x8B)
................................................4
Screws B(M4x6B)
................................................8*
Screws C(M4x10B)
..............................................8*
Joint-Plates ..........................................................2
Cushion Adhesive Tapes .....................................2
* Either Screws B or Screws C are used through the attaching method.
