Icom IC-706 MKII Instruction Manual page 24

21
4 RECEIVE AND TRANSMIT
© Noise blanker
The noise blanker reduces pulse-type noise such as @ Push [(F-2)ME] to toggle the noise blanker ON and
that generated by automobile ignition systems. This OFF.
function is not effective for AM broadcast reception, ¢"NB" appears when the noise blanker is turned ON.
FM modes or for non pulse-type noise. If you don't
want to use the noise blanker tor AM communications,
the "AM noise blanker" item in Initial Set mode must
be turned OFF (ON is the default setting—p. 47).
Appears when the
lai noise blanker is
HE ME turned ON.
O Select HI.
e Push [DISPLAY] 1 or 2 times when £ or [a is displayed.
e Push [MENU] one or more times to select t13.
© 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.
® Select Ii.
e Push [DISPLAY] 1 or 2 times when £ or la is displayed.
e Push [MENU} one or more times to select t14.
USB
TE oe ee Te oe
LE 8 Lecce
5s 3579 2 «æ so VFOA
© Preamp and attenuator
The preamp amplifies received signals in the front Push [P.AMP/ATT] momentarily to turn the preamp
end circuit to improve the S/N ratio and sensitivity. ON and OFF; push and hold to turn the attenuator ON.
Turn this function ON when receiving weak signals. *Lights green when the preamp is ON; lights red when
the 20 dB attenuator is ON.
The attenuator prevents desired signals from distort- e Only one of these functions can be activated at a time.
ing when very strong signals are near the desired fre- P.AMP/ATT
quency or when very strong electric fields, such as (C_m -e
from broadcasting stations, are near your location. Lights green while the preamp is activated;
lights red while the attenuator is activated.
© Peak meter hold INITIAL SET MODE
The peak meter hold function freezes the highest dis- [EXAMPLE]:
played bar segment in any meter function for about B l
0.5 sec. so that you can more easily read the meter. $1 3 5 7 9 20 40 60dB Initial reception of a
This function can be turned ON and OFF in initial set MENNTA SE signal results in an S-
Si 3579 20 The highest indicated
Gil bar remains displayed
for about 0.5 sec.
even when the signal
strength decreases.