Icom IC-7700 [90/216] Spectrum scope screen

Icom IC-7700 [90/216] Spectrum scope screen
5-2
Spectrum scope screen
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.
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 several times to close a multi-func-
tion screen, if necessary.
w Push [SCOPE] to select the scope screen.
e Push [CENT/FIX] to select the center mode.
•“ ” is displayed when center mode is selected.
r Push [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 [SPAN] for 1 sec. to return to ±2.5
kHz span.
Sweep speed is selectable for each span independently
in scope set mode. (pgs. 5-5, 5-6)
t Push [ATT] several times to activate an atten-
uator or turn the attenuator OFF.
10, 20 and 30 dB attenuators are available.
Push and hold [ATT] for 1 sec. to turn OFF the at-
tenuator.
y Push [MARKER] to turn the marker for trans-
mit frequency ON or OFF.
•“ ” 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 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] to freeze the current spectrum
display.
•“ ” appears while the function is in use.
The peak hold function can be deactivated in scope set
mode.
i Push to exit the scope screen.
NOTE: If a strong signal is received, a ghost signal
may also appear. Push [ATT] several times to
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.
F-2
EXIT/SET
HOLD
F-4
T
F-3
F-2
F-2
F-1
F-1
CENTER
F-5
F-1
EXIT/SET
F-2
ATT
F-4
HOLD
F-1
SPAN
F-3
MARKER
F-5
CENT/FIX
EXIT/SET
5
FUNCTIONS FOR RECEIVE
Scope spurious signal example
Spurious signals may be received on the spectrum
scope screen regardless of the transceivers state
(TX or RX). They are generated in the scope circuit.
This does not indicate a transceiver malfunction.
Scope spurious example

Содержание

Скачать