5 FUNCTIONS FOR RECEIVE■Spectrum scope screenDCenter mode

MARKER HOLD CENT/FIX

F-3 F-4 F-5

SPAN

ATT

EXIT/SET

F-1 F-2

• Observed indication example

This DSP-based spectrum scope allows you to display the conditions on the selected band, as well as relative strengths of signals. The IC-7700 has two modes for the spectrum indication— one is center mode, and anther one 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.

qPush EXIT/SET several times to close a multi-func- tion screen, if necessary.

wPush [F-1•SCOPE] to select the scope screen. e Push [F-5•CENT/FIX] to select the center mode.

•“ CENTER ” 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.

•Push and hold [F-1•SPAN] for 1 sec. to return to ±2.5 kHz span.

•Sweeping speed is selectable for each span indepen- dently in scope set mode. (pgs. 5-5, 5-6)

tPush [F-2•ATT] several times to activate an attenu- ator or turn the attenuator OFF.

•10, 20 and 30 dB attenuators are available.

•Push and hold [F-2•ATT] for 1 sec. to turn OFF the at- tenuator.

yPush [F-3•MARKER] to turn the marker for transmit 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 wave- form while transmitting. This can be deactivated in scope set mode. (p. 5-5)

•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)

uPush [F-4•HOLD] to freeze the current spectrum waveform.

•“ HOLD ” appears while the function is in use.

•The peak hold function can be deactivated in scope set mode.

iPush 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.

5-2