Preamplifier; Attenuator - Icom IC-7600 Instruction Manual

Preamplifier
The preamp amplifies received signals in the receiver
front end, to improve the S/N ratio and sensitivity.
Set this to preamp 1 or preamp 2 when receiving
weak signals.
Push [P.AMP] (MF3) several times to set the pre-
amp OFF, preamp 1 ON or preamp 2 ON.
Push and hold [P.AMP] (MF3) for 1 sec. to turn the
preamp function OFF.
For all HF and 50 MHz bands
High-gain preamp for 24 MHz band
and above (Available for all HF and
50 MHz bands)
About the "P.AMP2"
The "P.AMP 2" is a high gain receive amplifier. When
the "P.AMP 2" is used in the presence of strong elec-
tromagnetic fields, distortion sometimes results. In
such cases, use the transceiver with the "P.AMP 1" or
"P.AMP OFF" setting.
The "P.AMP 2" is most effective when:
• Used on bands above 24 MHz and when signals are
weak.
• Receive sensitivity is insufficient when using low-
gain antennas, or while using a narrow band
antenna (such as small loop, a Beverage antenna
or a short Yagi antenna).

Attenuator

The attenuator prevents a desired signal from distor-
tion when very strong signals are near the desired
frequency or when very strong electromagnetic fields,
such as from broadcast stations near your location.
Push [ATT] (MF4) several times to set the attenua-
tor 6 dB, 12 dB, 18 dB or attenuator OFF.
Push and hold [ATT] (MF4) for 1 sec. to turn the
attenuator function OFF.
6 dB attenuation
12 dB attenuation
18 dB attenuation
RECEIVE AND TRANSMIT
P.AMP
ATT
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