Arametric Icrophone Qualizer ( Ssb/Am/Fm Mode ); Enhancing Transmit Signal Quality - Yaesu FT-991 Operating Manual

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ArAMetric
The FT-991 includes a unique Three-Band Parametric Microphone Equalizer that provides precise, independent control
over the low, mid and treble ranges in your voice waveform. You may utilize one group of settings when the speech
processor is off and an alternate group of settings when the speech processor is on. The speech processor feature is de-
scribed in the next chapter.
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The Parametric Equalizer is a unique technique for adjusting the signal quality. The three audio ranges may be adjusted
so precisely, it is possible to craft an audio response that provides a natural and pleasant sound that you may not have
ever experienced before. Alternately, the effective "talk power" can be significantly enhanced.
The aspects of configuration that you may adjust on the Parametric Equalizer are:
Center Frequency: The center frequency of each of the three bands may be adjusted.
Gain: The amount of enhancement (or suppression) within each band may be adjusted.
Q: The bandwidth over which the equalization is applied may be adjusted.
Setup of the Parametric Microphone Equalizer
1. Connect the microphone to the MIC jack.
2. Set the RF output power to minimum value.
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 We recommend that you connect a dummy load
to one of the Antenna jacks, and monitor your
signal on a separate receiver, to prevent interfer-
ence to other users.
 You will have the best chance of hearing the ef-
fects of adjustments if you wear headphones
(connected to the monitor receiver) while listen-
ing to your transmitted signal.
3. To adjust the Parametric Microphone Equalizer
while the speech processor is disabled, press the
button, then touch [ MIC-EQ ] to select
F(M-LIST)
"ON".
To adjust the Parametric Microphone Equalizer with
the speech processor engaged, press the
button, then touch [ PROC ] to select "ON".
4. Touch [ MONI ] , if you want to listen on the
internal monitor.
5. Press the MENU(SETUP)
will appear in the display.
6. Rotate the MULT knob to find the "EQ" Menu area,
containing Menu items "119" through "127"; these
parameters apply to the adjustment of the Parametric
Microphone Equalizer when the speech processor
is disabled. Menu items "128" through "136" ap-
ply to the adjustment of the Parametric Microphone
Equalizer when the speech processor is engaged.
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icrophone quAlizer
F(M-LIST)
FT-991
button. The Menu list
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ignal ualiTY
( SSb/AM/FM
MENU (SETUP) Button
7. Touch [ SELECT ] on the LCD, then rotate the
MULT knob to perform adjustments to a particular
Menu item.
8. Press and hold the PTT switch, and speak into
the microphone while listening to the effect of the
changes you are making. Because the overall effect
on the sound will change with each adjustment, you
should make several passes through each adjustment
area, to be sure that you are achieving the optimum
settings.
9. When you have completed all adjustments, touch
[ ENTER ] on the LCD to save the new settings.
10. Press the MENU(SETUP) button or touch [ BACK ]
on the LCD to exit to normal operation. If you only
touch [ BACK ] momentarily to exit, none of the
changes you performed will be stored.
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To roll off excessive bass response in a wide-range stu-
dio microphone, try putting a 10 dB null at 100 Hz with
a bandwidth of "1" or "2", do about a 3 dB null centered
on 800 Hz with a bandwidth of "3," and then put an 8
dB peak centered on 2100 Hz with a bandwidth of "1."
These are starting recommendations; each microphone
and user's voice will be different, often requiring differ-
ent settings.
FT-991 O
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Mode
F(M-LIST) Button
MULTI Knob
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