Spectrum Scope Screen; D Center Mode - Icom IC-7800 Instruction Manual

5
FUNCTIONS FOR RECEIVE

■ Spectrum scope screen

D Center mode

[F-2•ATT] [F-4•HOLD]
[F-1•SPAN] [F-3•MARKER]
• Observed indication example
[F-5•CENT/FIX]
[EXIT/SET] [F-6•MAIN/SUB]
This function allows you to display the conditions of the
selected band, as well as relative strengths of signals.
The IC-7800 has two modes for the spectrum indica-
tion— one is center mode, and anther one is fix mode.
In addition, the IC-7800 has a mini scope screen for
regular scope indication.
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.
HOLD
• 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 waveform may be displayed. They
are made in internal scope circuit and does not indi-
cate a transceiver malfunction.
5-2