Icom IC-705 Basic Manual english - Page 38
Selecting the IF filter, SSB, CW, RTTY, and AM modes, SSB and CW modes
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4 RECEIVING AND TRANSMITTING Selecting the IF filter SSB, CW, RTTY, and AM modes The IC-705 has 3 IF filter passband widths for each mode, and you can select them on the FILTER screen. You can set the IF filter to wide (FIL 1), mid (FIL 2), or narrow (FIL 3). 1. Select the operating mode. (Example: USB) 2. Touch the filter icon for 1 second. •• Opens the FILTER (SSB) screen. 3. Touch the filter icon several times to select FIL 1 (wide), FIL 2 (mid), or FIL 3 (narrow). 4. Touch [BW]. You can reset to the default settings by touching this key for 1 second. •• Selects the passband width mode. 5. Rotate to select the passband width. LLYou cannot change the passband width in the FM, FM-D, WFM, or DV mode. LLWhen you change the passband width, the Digital Twin PBT setting value is reset to the center position. LL"BPF" is displayed when a band width less than 500 Hz is selected in the SSB, CW, or RTTY mode. 6. To close the FILTER screen, push . TIP: When you set the IF filter to FIL2 or FIL3 in the FM mode, the transceiver will transmit in the FM narrow mode. Mode SSB SSB-D CW RTTY AM AM-D FM FM-D DV WFM IF filter FIL 1 (3.0 kHz) FIL 2 (2.4 kHz) FIL 3 (1.8 kHz) FIL 1 (3.0 kHz) FIL 2 (1.2 kHz) FIL 3 (500 Hz) FIL 1 (1.2 kHz) FIL 2 (500 Hz) FIL 3 (250 Hz) FIL 1 (2.4 kHz) FIL 2 (500 Hz) FIL 3 (250 Hz) FIL 1 (9.0 kHz) FIL 2 (6.0 kHz) FIL 3 (3.0 kHz) FIL 1 (15 kHz) FIL 2 (10 kHz) FIL 3 (7.0 kHz) FIL 1 (200 kHz) Selectable range (steps) 50 Hz to 500 Hz (50 Hz)/ 600 Hz to 3.6 kHz (100 Hz) 50 Hz to 500 Hz (50 Hz)/ 600 Hz to 3.6 kHz (100 Hz) 50 Hz to 500 Hz (50 Hz)/ 600 Hz to 3.6 kHz (100 Hz) 50 Hz to 500 Hz (50 Hz) 600 Hz to 2.7 kHz (100 Hz) 200 Hz to 10.0 kHz (200 Hz) Fixed Fixed Selecting the IF filter shape SSB and CW modes You can set the IF filter shape for each mode. 1. Select the operating mode. (Example: USB) 2. Touch the filter icon for 1 second. •• Opens the FILTER (SSB) screen. 3. Touch [SHARP] or [SOFT]. 4. To close the FILTER screen, push . •• SHARP This selection is to emphasize the passband width of the filter. The filter has an almost ideal shape factor. Signals that are out of the passband are extremely filtered out, and it gives you better audio quality. •• SOFT The filter shoulders are roundly formed as in analog filters. This decreases noise components in the high and low frequencies of the filter passband, and increases the S/N of the target signal. These characteristics play an effective role in picking up very weak signals in the 50 MHz band, for example. The shape factor is retained, and the sharpness of the bandpass is excellent. 4-5 BASIC MANUAL