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

■ Notch function

[NOTCH] control for main
[NOTCH] for main
• Auto notch indication
• Manual notch indication

■ Digital selector

[DIGI-SEL] control for main
[DIGI-SEL] for main
[NOTCH] control for sub
[NOTCH] for sub
[DIGI-SEL] control for sub
[DIGI-SEL] for sub
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FUNCTIONS FOR RECEIVE
This transceiver has auto and manual notch functions.
The auto notch function automatically attenuates 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
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 operating 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 automatic pre-selector filters the desired signal
only and eliminates intermodulation from another
bands strong signals at the RF stage.
The automatic pre-selector that operates in conjunc-
tion with the operating frequency, follows the change
in operating frequency at the minimum kHz 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
dualwatch or split function)
is activated, mechanical noise will 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
(and sub dial during the
while the digital selector