Twin Pbt Operation; Noise Blanker - Icom IC-R75 Instruction Manual

■ Twin PBT operation

T h e t w i n P B T ( Pa s s b a n d Tu n i n g ) f u n c t i o n
electronically narrows the IF passband widths
to reduce interference. Moving both [TWIN PBT]
controls to the same position shifts the IF.
Variable range depends on the filter selection. ±1.29
kHz in 15 Hz steps and ±258 kHz in 3 Hz steps are
available.
PBT OPERATION EXAMPLE
Both controls at
center position
TWIN PBT
IF center frequency

■ Noise blanker

The noise blanker eliminates pulse-type noise
such as from car ignitions. The noise blanker is not
available for FM mode.
➥ Push the [NB] switch to turn the noise blanker ON
or OFF.
• When using the noise blanker, received signals
may be distorted if they are excessively strong.
• The noise blanker function in AM mode can be
deactivated depending on set mode setting. (p.
31)
• [TWIN PBT] should normally be set to the center
positions when there is no interference.
• When PBT is used, the audio tone may be
changed.
• PBT may not function with some IF filter
combinations.
• Not available for FM mode.
Cutting a lower
passband
TWIN PBT
Passband
Interference Desired signal
RECEIVE FUNCTIONS
Cutting both higher and
lower passbands
TWIN PBT
Passband
Interference Interference
Desired signal
[NB]
5
15