36
Tools for Comfortable and Effective Reception
FT-891 Advance Manual
IPO (Intercept Point Optimization)
The IPO feature allows the operator to optimize the characteristics of the receiver front
end according to the current noise level and the strength of incoming signals.
1. Press the [
F
] key repeatedly, to find the
“FUNCTION-1” list screen.
2. Rotate the
MULTI
function knob to select
“IPO”.
3. Press the
MULTI
function knob.
The IPO will turn on, bypassing the RF
preamplifier, yielding direct feed to the first
mixer.
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To set the IPO to “OFF”:
1. Press the [
F
] key repeatedly, to find the “FUNCTION-1” list screen.
2. Rotate the
MULTI
function knob to select “IPO”, then press the
MULTI
function 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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The IPO 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.
AGC (Automatic Gain Control)
The AGC system is designed to help compensate for fading and other propagation effects.
The AGC characteristics can be individually set for each operating mode. The basic
objective of AGC is to maintain a constant audio output level after a certain minimum
threshold signal strength is achieved.
1. Press the [
F
] key repeatedly, to find the
“FUNCTION-2” list screen.
2. Rotate the
MULTI
function knob to select
“AGC”.
3. Press the
MULTI
function knob, then rotate
it to select the desired receiver-recovery
time constant.
à
AUTO
à
FAST
à
MID
à
SLOW
à
...
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Where the “AUTO” setting represents “FAST” on CW/FM/DATA-FM, “MID” on RTTY/
DATA-LSB/DATA-USB, and “SLOW” on LSB/USB/AM.
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If you disable the AGC by pressing the
MULTI
function knob (“
” changes to
“
”), and the S-meter (which monitors AGC voltage) will cease to function.
Depending on the setting of the RF Gain control, incoming signals will probably be
distorted when the AGC is turned off.
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AGC 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.
