ICOM IC-7000 说明手册
72
5
FUNCTIONS FOR RECEIVE
5
■
Preamp and attenuator
The
preamp
amplifies received signals in the receiver
input (front end) circuit to improve the S/N ratio and
sensitivity. Turn this function ON when receiving weak
signals.
sensitivity. Turn this function ON when receiving weak
signals.
The
attenuator
prevents a strong undesired signal
near the desired frequency or near your location,
such as from a broadcast station, from causing dis-
tortion or spurious signals.
such as from a broadcast station, from causing dis-
tortion or spurious signals.
Push
[P.AMP/ATT]
momentarily to turn the preamp
ON and OFF; push and hold for 1 sec. to turn the at-
tenuator ON.
tenuator ON.
• “
” appears when the preamp is ON; “
” ap-
pears when the 12 dB attenuator is ON.
• Only one of these functions can be activated at a time.
momentarily
momentarily
1 sec.
[P.AMP/ATT]
“ ” or “ ” appears.
Scope set mode (Continued)
1 M
Ma
ax
x
H
Ho
ol
ld
d
This item turns the peak level holding function ON
and OFF.
and OFF.
O
ON
N
Peak hold is turned ON.
(default)
(default)
O
OF
FF
F
Peak hold is turned OFF.
2 S
Sc
co
op
pe
e
S
Si
iz
ze
e
This item toggles the scope size setting between nor-
mal and wide.
mal and wide.
N
No
or
rm
ma
al
l
Normal size is selected.
(default)
(default)
W
Wi
id
de
e
Wide size is selected.
3 F
FA
AS
ST
T
S
Sw
we
ee
ep
p
This item selects the sweep speed setting.
C
Co
on
nt
ti
in
nu
uo
ou
us
s
Push
[F-4
S
SP
PD
D
]
momentar-
ily to toggle the sweep
speed Fast and Slow contin-
uously. (default)
speed Fast and Slow contin-
uously. (default)
1
1
S
Sw
we
ee
ep
p
One Fast speed sweep oc-
curs each time
curs each time
[F-4
S
SP
PD
D
]
is
pushed momentarily.
4 F
FA
AS
ST
T
S
Sw
we
ee
ep
p
S
So
ou
un
nd
d
This item sets the monitoring sound level for fast
sweeping.
sweeping.
-
-1
10
0d
dB
B
:
Monitoring sound is set 10 dB smaller than
normal sound. (default)
normal sound. (default)
0
0d
dB
B
:
Same as normal sound.
O
OF
FF
F
:
No sound comes out while fast sweeping
.