Icom IC-7700 - Manual (Page 106)

■
Notch function
This transceiver has auto and manual notch functions.
The auto notch function uses DSP to automatically at-
tenuate more than 3 beat tones, tuning signals, etc.,
even if they are moving. The manual notch can be set
to attenuate a frequency via the [NOTCH] control.The
auto notch can be used in SSB, AM and FM mode.
The manual notch can be used in SSB, CW, RTTY,
PSK and AM modes.
➥
Push to toggle the notch function between
auto, manual and OFF in SSB and AM modes.
➥
Push to turn the manual notch function
ON and OFF in CW, RTTY, PSK modes.
➥ Push to turn the auto notch function ON
and OFF in FM mode.
• [NOTCH] indicator above this switch lights green.
• Push and hold
for 1 sec. to select the notch fil-
ter width for manual notch from wide, middle and nar-
row.
• Set to attenuate a frequency for manual notch via the
[NOTCH] control.
• “ ” appears when auto notch is in use.
• “ ” appears when manual notch is in use.
While tuning the manual notch, noise may be heard.
This comes from the DSP unit and does not indicate
an equipment malfunction.
■
Digital selector
The digital selector manually adjusts the center fre-
quency of the automatic pre-selector.
The automatic pre-selector adds selectivity ahead of
the 1st mixer. This reduces intermodulation distortion
from the nearby strong signals.
The automatic pre-selector tracks the frequency tun-
ing, changing it’s resonant frequency in discrete steps.
q Push to turn the digital selector ON and
OFF.
• [DIGI-SEL] indicator above this switch lights green.
w Rotate [DIGI-SEL] control to adjust the center fre-
quency.
NOTE:
• When rotating the main dial while the digital selec-
tor is activated, mechanical noise may be heard
due to the switching noise from internal relays.
• The preamp (P.AMP1 or P.AMP2) cannot be used
while the digital selector is activated.
DIGI-SEL
MN
AN
NOTCH
NOTCH
NOTCH
NOTCH
[NOTCH] control
NOTCH
[DIGI-SEL] control
DIGI-SEL
5-18
5
FUNCTIONS FOR RECEIVE
• Manual notch indication
• Auto notch indication