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Note: When operating either SSTV or fax, use a fast AGC setting and switch OFF your Speech Processor, for best results. REJECTING INTERFERENCE REJECTING INTERFERENCE The IF filters are designed for selecting the exact range of intermediate frequencies that are sent to the next stage in the receive circuit. Interference adjacent to the desired signal can be reduced by selecting a narrow bandwidth filter and/ or shifting the center frequency of the filter. To more effectively remove interference, combine the IF filtering and the DSP filtering (AF) described on pages 46 and 47. CHANGING THE IF FILTER BANDWIDTH When adjacent frequency interference is present at both sides of the desired signal, narrowing IF filter bandwidth may be the best way to remove the interference. Changing the filter bandwidth will not effect the current reception frequency. You can install 2 optional IF filters for SSB, CW, and FSK modes. After installing the optional filters {page 81}, the transceiver automatically recognizes what type of optional filters are installed. ¦ SSB/ AM When you operate the transceiver in SSB or AM mode, you can manually select the wide or narrow filter. Press [FIL/ NAR] (1 s) to select another IF filter. • Each press of [FIL/ NAR] (1 s) changes “ ” (Normal) / “NAR”, then back to “ ” (Normal). • If Menu No. 17 is ON (default is OFF) and 2 IF filters have been installed, you can select secondary IF filter. In this case, each press of [FIL/ NAR] (1 s) changes “ ” (Normal) / “NAR” / “NAR 2”, then back to “ ” (Normal). Mode IF filter bandwidth Normal Narrow SSB 2.4 kHz 1.8 kHz1/ 500 Hz2/ 270 Hz3 AM 6.0 kHz 2.4 kHz 1 Optional YF-107SN filter must be installed. 2 Optional YF-107C filter must be installed and Menu No. 17 must be set to ON. 3 Optional YF-107CN filter must be installed and Menu No. 17 must be set to ON. ¦ CW/ FSK When you operate in CW or FSK mode, the wide filter or narrow filter is automatically selected according to the DSP filter bandwidth that you select. The following table describes how the optional filter is selected as you change the bandwidth of DSP filter. You cannot manually select the IF filter. To change the DSP filter bandwidth, refer to “CHANGING THE DSP FILTER BANDWIDTH” {page 46}. IF Filter bandwidth DSP Filter (AF) bandwidth YF-107CN 270 Hz YF-107C 500 Hz YF-107SN 1.8 kHz ~ 300 Hz ~ 600 Hz ~ 2.0 kHz — — — 2.4 kHz (Normal) — — . 1.8 kHz (Normal) — . — 500 Hz (NAR) 2.4 kHz (Normal) . — — 270 Hz (NAR) 2.4 kHz (Normal) — . . 500 Hz (NAR) 1.8 kHz (Normal) . — . 270 Hz (NAR) 1.8 kHz (Normal) . . — 270 Hz (NAR 2) 500 Hz (NAR) 2.4 kHz (Normal) ¦ FM In FM mode, you cannot change the reception IF filter bandwidth. The bandwidth is fixed at 12 kHz. IF SHIFT (SSB/ CW/ FSK) Shifting the center frequency of the filter pass band is an additional method of removing adjacent frequency interference. Shifting this center frequency does not change the current reception frequency. To remove interference that is higher in frequency than the desired signal, turn the IF SHIFT control counterclockwise. To remove interference that is lower in frequency than the desired signal, turn the IF SHIFT control clockwise. IF pass band Interferingsignal MULTI IF SHIFT Desired signal 45 10 REJECTING INTERFERENCE DSP FILTERS KENWOOD digital signal processing (DSP) technology is adapted to this transceiver. Using DSP filtering (AF), you can control the bandwidth, cancel the multiple jamming beat, and reduce the noise level using DSP filtering technology. CHANGING THE DSP FILTER BANDWIDTH For improving interference reduction capability, this transceiver also provides the DSP filtering (AF) along with IF filters. When in SSB, FM, or AM mode, you can change the filter bandwidth by altering its low and/ or high cut-off frequency. For CW and FSK modes, you can change the filter bandwidth by directly specifying a bandwidth. Changing the DSP filter bandwidth (AF) does not affect the current reception frequency. ¦ SSB/ FM/ AM 1 Press [MODE] to select SSB, FM, or AM mode. 2 Press [FIL/ NAR]. • The current high-cut filter frequency for the mode appears on the sub-display. 3 Turn the MULTI control clockwise to raise the high cut-off frequency, or counterclockwise to lower the high cut-off frequency. IF MULTI SHIFT f IF MULTI SHIFT f 4 Press [FIL/ NAR] again. • The current low-cut filter frequency appears. 5 Turn the MULTI control clockwise to raise the low cut-off frequency, or counterclockwise to lower the low cut-off frequency. 6 To return to the normal operation, press [FIL/ NAR] or [MTR/ CLR]. IFIF MULTI SHIFT f MULTI SHIFT f Adjust Mode Frequency Selections (Hz) HI SSB/ FM 1000, 1200, 1400, 1600, 1800, 2000, 2200, 2400, 2600, 2800, 3000, 3400 (default), 4000, 5000 AM 2500, 3000 (default), 4000, 5000 LO SSB/ FM 0, 50, 100 (default), 200, 300, 400, 500, 600, 700, 800, 900, 1000 AM 0, 100 (default), 200, 500 Note: . The cut-off frequencies (LO) can be adjusted independently for each operating mode. When you change the operating m...
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