Icom IC-R75 Instruction Manual

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Contents

Icom IC-R75 Instruction Manual Manual pdf 18 page image

165 RECEIVE FUNCTIONS PreampThe preamp amplifies received signals in the frontend 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 andpreamp-2 or turn the preamp OFF. AttenuatorThe attenuator prevents desired signals from distort-ing when very strong signals are near the desired fre-quency or when very strong electric fields, such asfrom broadcasting stations, are near your location.➥ Push [ATT] toggle the 20 dB attenuator functionON and OFF.• “ATT” appears when the attenuator is turned ON. AGC time constantThe AGC (Automatic Gain Control) controls receivergain to produce a constant audio output level evenwhen the received signal strength is varied by fading,etc. Use AGC slow for normal phone operation; AGCfast for receiving data and searching for signals.➥ Push [AGC] momentary to toggle the AGC timeconstant between fast and slow.• “F.AGC” appears when the fast time constant is se-lected.• “AGC” appears when the slow time constant is se-lected.➥ Push [AGC] for 2 sec. to turn the AGC circuit OFF.• “AGC OFF” appears when the AGC circuit is turnedOFF.• Push [AGC] to turn the AGC circuit ON.USB R XBLANKBLANKS1 3 5 7 9 20 40 60 dBAGCANTVFO1PREAMP 1“PREAMP” appears while thepreamp is activated. Antenna selection2 types of antenna can be connected to this receiver.When 2 antennas are connected, select an antennadepending on the operating condition.➥ Push [ANT (SET) ] for 2 sec. to toggle between theantenna 1 and 2 connectors.• If a blank memory channel has been selected, push[V/M] to select VFO mode in advance.USB R XBLANKBLANKS1 3 5 7 9 20 40 60 dBAGCANTVFO1“ANT1” appears when the[ANT1] connector is in use.USB R XBLANKBLANKS1 3 5 7 9 20 40 60 dBAGCANTVFO1ATT“ATT” appears while the attenuatoris activated.USB R XBLANKBLANKS1 3 5 7 9 20 40 60 dBAGCANTVFO1 F. AGC“F.AGC” appears when the fast timeconstant is selected.