Icom IC-7850 Instruction Manual - Page 135

Previous view 7 FUNCTIONS FOR RECEIVE ■■Preamplifier The preamp amplifies received signals in the receiver front end to improve the signal-to-noise ratio and sensitivity. Set this to P.AMP 1 or P.AMP 2 when receiving weak signals. ➥➥Push [P.AMP]() several times to turn ON preamp 1 or preamp 2, or to turn OFF the preamp. ➥➥Hold down [P.AMP]() for 1 second to turn OFF the preamp. NOTE: The preamp (P.AMP 1 or P.AMP 2) cannot be used while the Digital RF selector is in use. Also the preamp is automatically disabled when the Digital RF selector is turned ON. (≈) Multi-function keys • When selecting Preamp 1 ✔ About P.AMP 2 P.AMP 2 is a high gain receive amplifier. When it is used during times of strong electric fields, distortion sometimes results. In such cases, set the transceiver to "P.AMP 1" or "P.AMP OFF." Especially for maintaining IP3. Gain is approximately 12dB. High-gain preamp for all bands. Gain is approximately 20dB. ■■Attenuator The attenuator prevents a desired signal from becoming distorted when very strong signals are near the frequency or when very strong electric fields, such as from broadcasting stations, are near your location. ➥➥Push [ATT]() several times to set the attenuator to 6 dB, 12 dB, 18 dB or turn OFF the attenuator. ➥➥Hold down [ATT]() for 1 second several times to set the attenuator to 3 dB, 6 dB, 9 dB, 12 dB, 15 dB, 18 dB, 21 dB or to turn OFF the attenuator. • When selecting Attenuator (6 dB) 7-2