Spectrum Scope Screen; D Center Mode - Icom ic-7700 Instruction Manual

5
FUNCTIONS FOR RECEIVE

■ Spectrum scope screen

D Center mode

MARKER
F-3
SPAN ATT
F-2
F-1
• Spectrum scope
• Scope spurious signal example
Spurious signals may be received on the spectrum
scope screen regardless of the transceiver's state
(TX or RX). They are generated in the scope circuit.
This does not indicate a transceiver malfunction.
Scope spurious example
HOLD CENT/FIX
F-4 F-5
EXIT/SET WIDE
F-7
Waterfall
This DSP-based spectrum scope allows you to dis-
play the frequency and relative signal strength of
received signals on the strengths of signals. The
IC-7700 has two modes for the spectrum display—
one is center mode, and the other is fixed mode.
In addition, the IC-7700 has a mini scope screen to
save screen space.
Displays signals around the set frequency within the
selected span. The set frequency is always displayed
at the center of the screen.
q Push
EXIT/SET
function screens, if necessary.
w Push [SCOPE]
• Push [WIDE]
F-7
tween normal and wide.
e Push [CENT/FIX]
CENTER
• " " is displayed when center mode is selected.
r Push [SPAN]
scope span.
• ±2.5, ±5.0, ±10, ±25, ±50, ±100 and ±250 kHz are se-
lectable.
• Hold down [SPAN]
kHz span.
• Sweep speed is selectable for each span independ-
ently in scope set mode. (pp. 5-5, 5-6)
t Push [ATT] F-2
tenuator or turn the attenuator OFF.
• 10, 20 and 30 dB of attenuation is available.
• Hold down [ATT]
tenuator.
y Push [MARKER]
mit frequency ON or OFF.
• " T " displays the marker at the transmit frequency.
• "<<" or ">>" appears when the marker is out of range.
• The spectrum scope shows the transmit signal while
transmitting. This can be deactivated in scope set
mode. (p. 5-5)
• The spectrum scope shows the peak level hold func-
tion. Peak levels are displayed in the background of the
current spectrum in a different color until the receive
frequency changes. This can be deactivated and the
waveform color can be set in scope set mode. (p. 5-5)
u Push [HOLD]
F-4
display.
• " " appears while the function is in use.
HOLD
• The peak hold function can be deactivated in scope set
mode.
i Push
EXIT/SET
NOTE: If a strong signal is received, a ghost signal
may also appear. Push [ATT]
activate the spectrum scope attenuator in this case.
Spurious signals may be displayed. They are gen-
erated in the internal scope circuit and do not indi-
cate a transceiver malfunction.
5-2
several times to close any multi-
to select the scope screen.
F-1
to toggle the screen size be-
to select the center mode.
F-5
several times to select the
F-1
for 1 second to return to ±2.5
F-1
several times to activate an at-
for 1 second to turn OFF the at-
F-2
F-3 to turn the marker for trans-
to freeze the current spectrum
to exit the scope screen.
several times to
F-2