ICOM 301500 Manual Do Utilizador

N Preamp and attenuator

The preamp amplifies received signals in the re-
ceiver input (front end) circuit to improve the S/N 
ratio and sensitivity. Turn this function ON when re-
ceiving weak signals.

The attenuator prevents very strong signals near the 
desired frequency, such as nearby broadcast sta-
tions or very strong amateur signals, from causing 
distortion of a desired signal.

±  Push 

 momentarily to turn the preamp ON 

and OFF; push and hold for 1 sec. to turn the 
attenuator ON.

 • 

 

“

” appears when the preamp is ON; “

” 

appears when the 20 dB attenuator is ON.

 

• Only one of these functions can be activated at a time.

Either “       ” or
“      ” appears.

momentarily

momentarily

1 sec.

: Push and hold             for 1 sec.

: Push             momentarily

N AGC function

The AGC (auto gain control) controls receiver gain to 
produce a constant audio output level even when the 
received signal strength is varied by fading, etc.

D AGC time constant selection

q  Push 

 once or twice to select the desired 

mode.

w  Push 

 once or twice to select AGC fast or 

AGC slow.

 • 

 

“F.AGC” appears for AGC fast; no indicator for AGC 
slow is selected, respectively.

e  Push and hold 

 for 1 sec. to turn the AGC 

OFF.

 • 

“AGC-OFF” appears for AGC OFF.

  (unit: sec.)

SSB

0.3 (FAST)

RTTY

0.1 (FAST)

2.0 (SLOW)

0.5 (SLOW)

CW

0.3 (FAST)

AM

3.0 (FAST)

0.8 (SLOW)

5.0 (SLOW)

45

5

FUNCTIONS FOR RECEIVE