5-2
■ Spectrum scope screen
This DSP-based spectrum scope allows you to display
the conditions on the selected band, as well as relative
strengths of signals. The IC-7800 has two modes for
the spectrum indication— one is center mode, and an-
ther one is fix mode.
In addition, the IC-7800 has a mini scope screen to
save screen space.
DD
Center mode
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] several times to close a multi-
function screen, if necessary.
w Push [F-1•SCOPE] to select the scope screen.
e Push [F-5•CENT/FIX] to select the center mode.
• “ ” is displayed when center mode is selected.
r Push [F-1•SPAN] several times to select the scope
span.
• ±2.5, ±5.0, ±10, ±25, ±50, ±100 and ±250 kHz are avail-
able.
• Sweeping speed is selectable for each span indepen-
dently in scope set mode. (pgs. 5-5, 5-6)
t Push [F-2•ATT] several times to activate an attenu-
ator or turn the attenuator OFF.
• 10, 20 and 30 dB attenuators are available.
y Push [F-6•MAIN/SUB] to select main band.
• The spectrum scope with sub band selection is activated
during dualwatch or split frequency operation only.
u Push [F-3•MARKER] several times to select the
marker (sub readout or transmit frequency) or turn
the marker OFF.
• “ ” displays the marker at the transmit frequency.
• “ ” displays the marker at the sub readout frequency.
• “<<” or “>>” appears when the marker is out of range.
• The spectrum scope shows the transmit signal wave-
form while transmitting. This can be deactivated in
scope set mode. (p. 5-4)
• The spectrum scope shows the peak level holding func-
tion. Peak levels are displayed in the background of the
current 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)
i Push [F-4•HOLD] to freeze the current spectrum
waveform.
• “ ” appears while the function is in use.
• The peak hold function can be deactivated in scope set
mode.
o Push [EXIT/SET] to exit the scope screen.
NOTE: If a strong signal is received, a ghost wave-
form may appear. Push [F-2•ATT] several times to
activate the spectrum scope attenuator in this case.
Spurious signal waveforms may be displayed. They
are generated in the internal scope circuit and do
not indicate a transceiver malfunction.
HOLD
