Receiving And Transmitting - Icom IC-905 Basic Manual

Preamplifiers
144, 430, and 1200 MHz bands
The preamp amplifies received signals in the receiver
front end to improve the signal-to-noise ratio and
sensitivity. A preamp is used when receiving weak
signals.
L Each band memorizes the Preamplifier setting.
1. Select the operating band.
2. Push .
• Opens the FUNCTION screen.
3. Touch [P.AMP/ATT] to turn this function ON or
OFF.
4. To close the FUNCTION screen, push
NOTE: When you use the preamp while receiving
strong signals, the receiving signal may be distorted.
In such case, turn OFF the preamp.

RECEIVING AND TRANSMITTING

Attenuator
144, 430, and 1200 MHz bands
The Attenuator prevents a desired signal from
becoming distorted when a very strong signal is near
the frequency, or when a very strong electric field,
such as from a broadcasting station, is near your
location.
L Each band memorizes the Preamplifier setting.
1. Select the operating band.
2. Push
3. Touch [P.AMP/ATT] for 1 second.
.
4. To close the FUNCTION screen, push
Displayed when
a preamp is ON.
L If a strong signal is received and "OVF" (Overflow)
is displayed, turn ON the attenuator, or reduce the
RF gain until "OVF" disappears. (p. 3-9)
4-1
.
• Opens the FUNCTION screen.
L Touching [P.AMP/ATT] again turns OFF the
Attenuator.
4
3
4
.
Displayed when
the Attenuator
is ON.