Icom IC-7700 - Manual (Page 97)

5-9
■
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 sig-
nals.
➥
Push [P.AMP] (MF3) several times to set the preamp
OFF, preamp 1 ON or preamp 2 ON.
For all HF bands
High-gain preamp for 24 MHz band and
above
✔
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 fre-
quency or when very strong electromagnetic fields,
such as from broadcasting stations near your location.
➥
Push [ATT] (MF4) several times to set the attenuator
6 dB, 12 dB, 18 dB or attenuator OFF.
➥
Push and hold [ATT] (MF4) for 1 sec. to turn the at-
tenuator function OFF.
P.AMP
2
P.AMP
1
P.AMP
ATT
5
FUNCTIONS FOR RECEIVE
6 dB
attenuation
12 dB
attenuation
18 dB
attenuation
ATT
18dB
ATT
12dB
ATT
6dB