Icom IC-7800

■ Notch function
This transceiver has auto and manual notch functions.
The auto notch function uses DSP to automatically at-
tenuates 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
modes.
The manual notch can be used in SSB, CW, RTTY,
PSK and AM modes.
• Auto notch indication
➥ Push [NOTCH] to toggle the notch function between
auto, manual and OFF in SSB and AM modes.
➥ Push [NOTCH] to turn the manual notch function
ON or OFF in CW mode.
➥ Push [NOTCH] to turn the auto notch function ON
or OFF in FM mode.
 •[NOTCH]indicatorabovetheirswitchlightsgreen.
 •Holddown[NOTCH]for1second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
[DIGI-SEL] control for main
[DIGI-SEL] for sub[DIGI-SEL] for main
[DIGI-SEL] control for sub
The digital selector manually adjusts the center fre-
quency of the automatic pre-selector. The digital se-
lector functions within 1.5 MHz to 29.999999 MHz
range.
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 [DIGI-SEL] to turn the digital selector ON or
OFF.
 •[DIGI-SEL]indicatorabovetheirswitchlightsgreen.
w Rotate [DIGI-SEL] control to adjust the center fre-
quency.
NOTE:
•Whenrotatingthemaindial
(or sub dial during du-
alwatch or split function)
while the digital selector 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.
5-20
5
FUNCTIONS FOR RECEIVE
• Manual notch indication