Functions For Receive; Spectrum Scope Screen; D Center Mode - Icom IC-7700 Instruction Manual

5

FUNCTIONS FOR RECEIVE

■ Spectrum scope screen

D D Center mode
MARKER
F-3
SPAN ATT
F-1 F-2
• 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
This DSP-based spectrum scope allows you to display
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
tion screen, if necessary.
w Push [SCOPE]
e Push [CENT/FIX]
• " " is displayed when center mode is selected.
CENTER
r Push [SPAN]
scope span.
• ±2.5, ±5.0, ±10, ±25, ±50, ±100 and ±250 kHz are avail-
able.
• Push and hold [SPAN]
kHz span.
• Sweep speed is selectable for each span independently
in scope set mode. (pgs. 5-5, 5-6)
t Push [ATT]
F-2
uator or turn the attenuator OFF.
• 10, 20 and 30 dB attenuators are available.
• Push and hold [ATT]
tenuator.
y Push [MARKER]
mit frequency ON or OFF.
• " " displays the marker at the transmit frequency.
T
• "<<" 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 function.
Peak levels are displayed in the background of the cur-
rent spectrum in a different color until the receive fre-
quency changes. This can be deactivated and the wave-
form 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 a multi-func-
to select the scope screen.
F-1
to select the center mode.
F-5
several times to select the
F-1
for 1 sec. to return to ±2.5
F-1
several times to activate an atten-
for 1 sec. to turn OFF the at-
F-2
to turn the marker for trans-
F-3
to freeze the current spectrum
to exit the scope screen.
several times to
F-2