Noise Blanker; Agc Time Constant; Preamp And Attenuator; Peak Meter Hold - Icom IC-706MKIIG Instruction Manual

4
RECEIVE AND TRANSMIT
D
The noise blanker reduces pulse-type noise such as
that generated by automobile ignition systems. This
function is not effective for FM modes or for non
pulse-type noise. If you don't want to use the noise
blanker for AM communications, the "AM noise
blanker" item in Initial Set mode must be turned OFF
(ON is the default setting—p. 53).
➀
Select .
•Push [DISPLAY] 1 or 2 times when
until is displayed.
D
The AGC (Automatic Gain Control) controls receiver
gain to produce a constant audio output level even
when the received signal strength is varied by fading,
etc. Use AGC slow for normal phone operation; AGC
fast for receiving data and searching for signals. AGC
time constant cannot be changed in FM mode.
➀
Select .
• Push [DISPLAY] 1 or 2 times when
• Push [MENU] one or more times to select
➁
Push [(F-3)
between fast and slow.
• "F " appears when the fast time constant is selected.
AGC
D
The preamp amplifies received signals in the front
end circuit to improve the S/N ratio and sensitivity.
Turn this function ON when receiving weak signals.
The attenuator prevents desired signals from distort-
ing when very strong signals are near the desired fre-
quency or when very strong electric fields, such as
from broadcasting stations, are near your location.
D
The peak meter hold function freezes the highest
displayed bar segment in any meter function for
about 0.5 sec. so that you can more easily read the
meter. This function can be turned ON and OFF in ini-
tial set mode (see p. 51).
21
or is displayed,
or is displayed.
.
] to toggle the AGC time constant
INITIAL SET MODE
• Push [MENU] one or more times to select
➁
Push [(F-2) ] to toggle the noise blanker ON and
OFF.
• "NB" appears when the noise blanker is turned ON.
USB
NB
VFO A
S1 3 5 7 9 20 40 60dB
P 5
10
O
USB
F
AGC
VFO A
S1
3 5 7 9 20 40 60dB
P 5 10
O
Push [P.AMP/ATT] momentarily to turn the preamp
ON and OFF; push and hold to turn the attenuator ON.
• Lights green when the preamp is ON; lights red when
the 20 dB attenuator is ON.
• Only one of these functions can be activated at a time.
P.AMP/ATT
Lights green while the preamp is activated;
lights red while the attenuator is activated.
[EXAMPLE]:
S1
3 5 7 9 20 40
S1
3 5 7 9 20 40
.
Appears when the
noise blanker is
CH
turned ON.
Appears when
AGC fast is
CH
selected.
60dB Initial reception of a
signal results in an S-
meter reading of 40
dB.
60dB The highest indicated
bar remains displayed
for about 0.5 sec.
even when the signal
strength decreases.