Notch Function; Digital Selector - Icom IC-7800 Instruction Manual

■ Notch function

• Auto notch indication
• Manual notch indication

■ Digital selector

[DIGI-SEL] control for main
[DIGI-SEL] for main
[DIGI-SEL] control for sub
[DIGI-SEL] for sub
FUNCTIONS FOR RECEIVE
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.
➥ 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 and OFF in CW mode.
➥ Push [NOTCH] to turn the auto notch function ON
and OFF in FM mode.
• [NOTCH] indicator above their switch lights green.
• Push [NOTCH] for 1 sec. to select the notch filter width
for manual notch from wide, middle and narrow.
• 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.
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 and
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
alwatch or split function)
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.
5-19
(or sub dial during du-
while the digital selector is
5