Notch Function; Digital Selector - Icom IC-7700 Instruction Manual

5
FUNCTIONS FOR RECEIVE

■ Notch function

• Auto notch indication
• Manual notch indication

■ Digital selector

[NOTCH] control
NOTCH
The digital selector manually adjusts the center fre-
[DIGI-SEL] control
DIGI-SEL
5-18
This transceiver has auto and manual notch functions.
The auto notch function uses DSP to automatically at-
tenuate up to 3 beat tones, tuning signals, etc., even if
they are moving. The manual notch can be set to at-
tenuate 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
NOTCH
auto, manual and OFF in SSB and AM modes.
➥ Push
NOTCH to turn the manual notch function
ON and OFF in CW, RTTY, PSK modes.
➥ Push
to turn the auto notch function ON
NOTCH
and OFF in FM mode.
• [NOTCH] indicator above this switch lights green.
• Push and hold
NOTCH
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.
AN
• " " appears when manual notch is in use.
MN
While tuning the manual notch, noise may be heard.
This comes from the DSP unit and does not indicate
an equipment malfunction.
quency of the automatic pre-selector. The available fre-
quency is between the 1.5 MHz to 29.999999 MHz
range.
The automatic pre-selector adds selectivity ahead of
the 1st mixer. This reduces intermodulation distortion
from strong signals near the received frequency.
The automatic pre-selector tracks the frequency tun-
ing, changing its center frequency in discrete steps.
q Push
to turn the digital selector ON and
DIGI-SEL
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.
for 1 sec. to select the notch fil-