Icom i9100 User Manual

71
5
FUNCTIONS FOR RECEIVE
■ Preamplier
The preamplifier amplifies weak signals in the receiver
front end, to improve the S/N ratio and sensitivity.
Turn this function ON when receiving weak signals.
The AG-25, AG-35 or AG-1200*
1
preamplifier unit is
required for 144, 430 or 1200 MHz*
2
frequency band.
•Besuretosetthe“EXT-P.AMP”itemforeachfrequency
band in the Set mode. (pp. 165, 166)
(Frequency band: HF/50 MHz)
➥Push[P.AMP•ATT]oneormoretimestosetthepre-
amp OFF, preamp 1 ON or preamp 2 ON.
 •Either“P.AMP ” or “P. AMP ” is displayed when the
preamp 1 or preamp 2 is ON.
 •NoindicatorisdisplayedwhenthepreampisOFF.
P. AMP
Wide dynamic range preamplifier. It is most
effective for the 1.8 to 21 MHz bands.
P. AMP
High-gain preamplifier. It is most effective
for the 24 to 50 MHz bands.
(Frequency band: 144/430/1200 MHz*
2
)
➥Push[P.AMP•ATT]onceortwicetoturnanoptional
preamplifier unit ON or OFF, if installed.
 •“P.AMP”appearswhenthepreamplierunitisON.
 •Noindicatorisdisplayedwhenthepreamplierunitis
OFF.
■ Attenuator
The attenuator prevents a desired signal from being
distorted when very strong signals are near the signal’s
frequency, or when very strong electromagnetic fields,
such as from broadcast stations are near your location.
These can both be independently set for each band.
➥ Hold down [P.AMP/ATT] for 1 second to turn ON the
Attenuator.
 •“ATT”appearsonthedisplaywhentheAttenuatoris
ON.
➥ Push [P.AMP/ATT] momentarily to turn it OFF.
[P.AMP•ATT]
✔ About the “P.AMP2” preamplifier
The preamp 2 is a high gain receive amplifier. When
it is used in the presence of strong electromagnetic
fields, distortion sometimes results. In such cases, use
either the “P.AMP 1” or “P.AMP OFF” setting.
Preamp 2 is most effective when:
•Usedonbandsabove24MHzandwhensignalsare
weak.
•Receivesensitivityisinsufcientwhenusinglow-gain
antennas, or while using a narrow band antenna.
(such as small loop, a Beverage antenna or a short
Yagiantenna)
*
1
AG-1200 has been discontinued, but it can be still be
used.
*
2
The optional UX-9100 is required for 1200 MHz frequency
band operation.
About the Preamplier and Attenuator switching procedure
The Preamplifier and Attenuator are switched with [P.AMP/ATT], as shown below.
Hold down
Push
ATT ON
Push
P.AMP
OFF
P.AMP
ON
Push
ATT ON
Hold down
Push
P.AMP
OFF
P.AMP
P.AMP
• HF/50 MHz frequency bands
• 144/430/1200 MHz frequency bands
[P.AMP•ATT]

Icom i9100 Specifications

General

Brand	Icom
Model	i9100
Category	Transceiver
Language	English