ICOM IC-R75 Manuale Utente

16

5

RECEIVE FUNCTIONS

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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.

➥

  Push [P.AMP] to toggle between preamp-1 and 

preamp-2 or turn the preamp OFF.

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The  attenuator  prevents  desired  signals  from 
distorting when very strong signals are near the 
desired frequency or when very strong electric fields, 
such as from broadcasting stations, are near your 
location.

➥

  Push [ATT] toggle the 20 dB attenuator function 

ON and OFF.

  • “ATT” appears when the attenuator is turned ON.

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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.

➥

  Push [AGC] momentary to toggle the AGC time 

constant between fast and slow.

  •  “F.AGC”  appears  when  the  fast  time  constant  is 

selected.

  •  “AGC”  appears  when  the  slow  time  constant  is 

selected.

➥

  Push [AGC] for 2 sec. to turn the AGC circuit OFF.

  •  “AGC OFF” appears when the AGC circuit is turned 

OFF.

  •  Push [AGC] to turn the AGC circuit ON.
  •  S-meter is deactivated when the AGC circuit is turned 

OFF.

“PREAMP” appears while the 
preamp is activated.

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2 types of antenna can be connected to this receiver. 
When 2 antennas are connected, select an antenna 
depending on the operating condition.

➥

  Push [ANT

(SET)

] for 2 sec. to toggle between the 

antenna 1 and 2 connectors.

  •  If a blank memory channel has been selected, push 

[V/M] to select VFO mode in advance.

“ANT1” appears when the 
[ANT1] connector is in use.

“ATT” appears while the attenuator
is activated.

“F.AGC” appears when the fast time 
constant is selected.