107
FC-40 External Automatic Antenna Tuner (for Wire Antenna)
FT-891 Advance Manual
Setup the FT-891
Before operation can begin, the FT-891 microprocessor must be setup to accommodate
the FC-40 automatic tuner. This is done using the Menu Mode:
1. Press and hold in the [
F
] key for one second
to activate the Menu mode.
2. Rotate the
MULTI
function knob to select
Menu Mode “
16-15
[
TUNER SELECT
]”.
3. Press the
MULTI
function knob, and then ro-
tate it to set this Menu item to “EXTERNAL”.
4. Press the
MULTI
function knob to save the
new setting.
5. Press the [
F
] key to exit the Menu mode and
resume normal operation.
Operation
1. Press the [
F
] key repeatedly to find the
“FUNCTION-1” list screen.
2. Rotate the
MULTI
function knob to select “TNR”.
3. Press and hold the
MULTI
function knob for
one second to begin automatic tuning. The
transmitter will be engaged, and the “WAIT”
will blink while tuning is in progress.
4. Tuning will stop automatically when a low
SWR is achieved. You may Press the
MULTI
function knob while tuning is in prog-
ress, to cancel the automatic tuning.
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To set the Antenna Tuner Function to “OFF”:
1. Press the [
F
] key repeatedly, to find the “FUNCTION-1” list screen.
2. Rotate the
MULTI
function knob to select “TNR”, and then press the
MULTI
func-
tion knob.
3. Press and hold the [
F
] key for one second to exit the “FUNCTION-1” list screen
and resume normal operation.
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Antenna Tuner function may be assigned to the [A], [B] or [C] key. Refer to “Changing
the function assigned to the [A]/[B]/[C] keys” in the FT-891 Operating Manual.
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The carrier signal transmits continuously while tuning is in progress. Please monitor
the operating frequency before beginning the tuning process. Be sure you are not
interfering with others who may already be using the frequency.
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It is normal to hear the sound of the relays while tuning is in progress.
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If the impedance cannot be matched by the FC-40 better than 2:1, and the “Hi-SWR”
icon appear, the microprocessor will not retain the tuning data for that frequency, as
the FC-40 presumes that you will want to adjust or repair your antenna system to
correct the high SWR condition.
