Icom IC-7700 Stereo Amplifier User Manual


 
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.
qPush to turn the digital selector ON and
OFF.
• [DIGI-SEL] indicator above this switch lights green.
wRotate [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