D Noise Blanker - Icom I706MKTMG Instruction Manual

4
RECEIVE AND TRANSMIT

D Noise blanker

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 M3.
• Push [DISPLAY] 1 or 2 times when S or G is displayed.
• Push [MENU] one or more times to select M3.
D AGC time constant
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 M4.
• Push [DISPLAY] 1 or 2 times when S or G is displayed.
• Push [MENU] one or more times to select M4.
➁
Push [(F-3)AGC] to toggle the AGC time constant
between fast and slow.
• "F " appears when the fast time constant is selected.
AGC
D Preamp and attenuator
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 Peak meter hold
The peak meter hold function freezes the highest dis-
played 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 initial set
mode (see p. 51).
21
➁
M3 NAR NB MET
M4 VOX COM AGC
Push [P.AMP/ATT] momentarily to turn the preamp
ON and OFF; push and hold to turn the attenuator ON.
INITIAL SET MODE
[EXAMPLE]:
S1
S1
Push [(F-2)NB] 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
CH
P 5 10
O
USB
F
AGC
VFO A
S1
3 5 7 9 20 40 60dB
CH
P 5 10
O
• 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.
3 5 7 9 20 40 60dB
3 5 7 9 20 40 60dB
Appears when the
noise blanker is
turned ON.
Appears when
AGC fast is
selected.
Initial reception of a
signal results in an S-
meter reading of 40
dB.
The highest indicated
bar remains displayed
for about 0.5 sec.
even when the signal
strength decreases.