Icom IC-R9500 [75/194] Attenuator

Icom IC-R9500 [75/194] Attenuator
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] several times to set the preamp OFF,
preamp 1 ON or preamp 2 ON.
About the “P.AMP2”
The “P.AMP 2” is a high gain receive amplifier. When
the “P.AMP 2” is used when strong signal are present,
distortion sometimes results. If this occurs, use the re-
ceiver 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 during low gain, 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 being
distorted by a very strong signals are near the desired
frequency or when very strong electric fields, such as
from broadcasting stations, are near your location.
Push [ATT] several times to select the desired at-
tenuator or attenuator OFF.
During HF bands operation, 6, 12, 18, 24, 30 dB are
available.
During 30–1150 MHz operation, 10, 20, 30 dB are available.
During 1150–3335 MHz operation, only 20 dB is avail-
able.
Push and hold [ATT] for 1 sec. to turn OFF the at-
tenuator, when it’s ON.
[ATT]
[P.AMP]
5
RECEIVE FUNCTIONS
• HF bands
6dB
attenuation
12 dB
attenuation
18 dB
attenuation
24 dB
attenuation
30 dB
attenuation
• 30–1150 MHz
10 dB
attenuation
20 dB
attenuation
30 dB
attenuation
• 1150–3335 MHz
20 dB
attenuation
During 1150–3335 MHz (ANT2) operation, either the
preamplifier or attenuator is activate exclusively.
• Below 30 MHz
For all
HF bands
For all
HF bands
Above 30 MHz
Only ON/OFF
is available

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