Icom IC-7100 Advanced Instructions - Page 100
Twin PBT operation, Mode: SSB/CW/RTTY/AM, PBT OPERATION EXAMPLE
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Previous view 5 FUNCTIONS FOR RECEIVE Twin PBT operation (Mode: SSB/CW/RTTY/AM) To reject interference, PBT (Passband Tuning) electronically narrows the IF passband width by shifting the IF frequency slightly outside of the IF filter passband. The IC-7100 uses DSP for the PBT function. Moving both TWIN-PBT ([M-CH/BANK] (L)) controls shift the IF passband center frequency both above and below the received frequency. ➥➥The LCD graphically shows the passband width and frequency shift. ➥➥Touch the Filter icon for 1 second to display the "FILTER" screen. Current passband width and frequency shift are displayed in the "FILTER" screen. ➥➥Hold down [CLR] (L) for 1 second to set the IF frequency to the center position. • The "dots" disappear. The PBT is adjustable in 50 Hz steps in the SSB/CW/ RTTY modes, and 200 Hz in the AM mode. In this time, the shift value changes in 25 Hz steps in the SSB/CW/RTTY modes, and 100 Hz in the AM mode. • The TWIN-PBT controls should normally be set to the center positions when there is no interference. The PBT setting should be cleared. • When the PBT is used, the audio tone may change. • The controls do not function in the FM, WFM and DV modes. • While rotating the TWIN-PBT ([M-CH/BANK] (L)) controls, noise may occur. This comes from the DSP unit and does not indicate an equipment malfunction. • Pushing [M-CH]] (L) displays the filter passband width and shift value for 1 second. Passband width and shift value are displayed while the TWIN PBT is used. • "FILTER" screen display Appear when passband is shifted. Shows the selected filter and passband width. • While adjusting the PBT setting A dot appears when the passband is shifted. • About Passband width and Shift value on the screen BW : Passband width (W idth of () with which two PBTs overlap) IF center frequency SFT : Shift value Passband's center frequency PBT OPERATION EXAMPLE Both controls in the center positions PBT2 PBT1 Cutting the lower passband edge PBT2 PBT1 Cutting both lower and higher passband edges PBT2 PBT1 Passband Passband IF center frequency Interference Desired signal 5-5 Interference Desired signal Interference