Icom IC-R75 Instruction Manual - Page 19

5 RECEIVE FUNCTIONS ■ 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. • [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. PBT OPERATION EXAMPLE Both controls at center position Cutting a lower passband Cutting both higher and lower passbands TWIN PBT TWIN PBT TWIN PBT Passband Passband IF center frequency Interference Desired signal ■ 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) Interference Interference Desired signal [NB] 15