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(24) NR/AN
The primary function of this button is NR
(noise reduction). Press NR. SET NR will
appear in green letters on the screen next to
the MULTI knob. Use the MULTI knob to
adjust value. The NR value is shown on the
screen just above the button.
There are 9 different settings, and each of
the 9 are used to determine how
aggressively (quickly) the NR adapts and
identifies what is signal and what is noise.
Once the noise reduction value has been set
for a given signal, no further adjustment of
the noise reduction control is needed.
Turning the NR to a higher value adjusts
only how fast it adapts to a given signal vs.
.
noise situation
The alternate function is AN (automatic
notch). Press ALT then AN. SET AN will
appear in green letters on the screen next to
the MULTI knob. Use the MULTI knob to
adjust value. The AN value is shown on the
screen just above the button.
The automatic notch filter is used for
notching out carriers in USB and LSB
modes. Multiple carriers will be notched by
the automatic filter. Higher values indicate
more aggressive action by the autonotch for
suppressing undesired carriers
The AN function is locked out and not
selectable in CW modes.
(25) MIC/MON
The primary function of this button is MIC
(microphone gain). Press MIC. MIC GN
and the set percentage value will appear in
green letters on the screen next to the
MULTI knob. Turn the MULTI knob to adjust
the value.
In LSB, USB, and AM modes, mic gain on
the OMNI-VII is set properly by turning the
MULTI knob while speaking into the
microphone. The red ALC LED will flash.
When the light is flashing consistently on
voice peaks the proper mic gain level has
been set. There is some variability here
588 manual
Part #74409
Printed in USA
depending on the microphone used and how
loud you are speaking into the microphone.
The ALC light used to adjust mic gain in
SSB modes is lit constantly while
transmitting FM.
The alternate function of this button is MON,
allowing monitoring of transmitted audio.
Press ALT then MON. Adjust the MULTI
knob to set value of monitor audio.
OMNI-VII is also equipped with a hardware
mic gain control, accessible under the
bottom panel. It is described in FACTORS
THAT AFFECT THE SOUND OF SSB
TRANSMIT AUDIO AND THEIR
ADJUSTMENT in Section 5. We
recommend you read and understand this
section before experimenting with the
hardware mic gain control.
(26) ATTN/PRE
OMNI-VII is equipped with both a step
attenuator and on/off preamp.
The primary function of this button is to
engage the step attenuator on receive.
Press ATTN. The attenuator cycles among
6 dB, 12 dB and 18 dB of receive
attenuation and then reverts to OFF.
The alternate function is a 12 dB boost
on/off preamp. Both noise and signal levels
are brought up 12 dB when the preamp is
activated. Press ALT then PRE. When on,
the preamp designator PRE will be reverse
highlighted in green. Preamp settings are
retained in transceiver memories and will
also be recalled per band when changing
bands.
(27) NCH/NB
The primary function of this button is to
activate a manual notch filter. The notch
filter is in the receiver chain post-AGC and
post-DSP filtering.
After pushing NCH, NCH FRQ plus the notch
frequency in Hz will be shown in green
lettering next to the MULTI knob on the
Second release – August 2007
14
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