Icom IC-775DSP [33/67] Apf operation

Содержание

FUNCTION OPERATIONS 4 APF operation Audio peak filter operation The APF Audio Peak Filter changes the receive frequency response by boosting up a particular frequency to pick up a desired CW signal The peak frequency can be adjusted with APF from 200 to 1000 Hz manually Auto audio peak filter operation I DSP An auto APF which has an 80 Hz ultra narrow passband is available for the DSP equipped type The center frequency of the auto APF is automat ically set to the same frequency of the CW pitch setting thus you can receive only a zero in signal Push CW REV to select CW mode Push APF to turn the audio peak filter ON Push CW REV to select CW mode 2 Push AUTO to turn the auto APF function ON The red indicator lights when the function is ON Cancel the auto APF DSP equipped type only when used Rotate APF to adjust the peak frequency Push APF to cancel the audio peak filter The AUTO switch activates the auto notch in phone modes SSB AM FM p 29 3 Push AUTO again to cancel the function P For the IC 775 AF LPF functions as the auto audio peak filter switch in CW mode when an optional UI 100 is installed and activated APF switch AUTO switch APF control Noise blanker The noise blanker eliminates pulse type noise such as from car ignitions and wide pulse type noise such as woodpecker The noise blanker is not available for FM mode Push NB to turn the noise blanker ON 2 Adjust NB LEVEL depending on the noise level if required Woodpecker noise aind blank width Woodpecker 11 Echo noise Audio output when NB WIDE OFF _____ If the noise blanker distorts the receive audio rotate NB LEVEL counterclockwise To suppress woodpecker and other wide pulse type noise turn BLK WIDTH max counter clockwise and then push NB WIDE Blank width when NB WIDE ON BLK WIDTH Max CCW___ Echo noise is not i removed The wide noise blanker circuit automatically adjusts the blank width corresponding to the width of the pulse type noise To suppress echo noise from woodpecker turn BLK WIDTH clockwise NOTE When using the noise blanker received P signals may be distorted if they are excessively strong For the PSP equipped type the NB WIDE switch can be assigned to a noise reduction P on off switch p 43 NB WIDE can be turned ON and OFF in P set mode in this case Blank width when NB WIDE ON BLK WIDTH Max CW ____ Blank width can be adjusted 30