Preamplifier; Attenuator - Icom IC-7700 Instruction Manual

■ Preamplifier

P.AMP

■ Attenuator

ATT
FUNCTIONS FOR RECEIVE
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)
OFF, preamp 1 ON or preamp 2 ON.
➥ Push and hold [P.AMP]
preamp function OFF.
For all HF bands
P.AMP
1
High-gain preamp for 24 MHz band and
P.AMP
above
2
✔ 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).
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 broadcast stations near your location.
➥ Push [ATT]
(MF4)
6 dB, 12 dB, 18 dB or attenuator OFF.
➥ Push and hold [ATT]
tenuator function OFF.
6 dB
ATT
attenuation
6dB
12 dB
ATT
attenuation
12dB
18 dB
ATT
attenuation
18dB
5-9
several times to set the preamp
for 1 sec. to turn the
(MF3)
several times to set the attenuator
for 1 sec. to turn the at-
(MF4)
5