User manual KENWOOD TS-690S SERVICE MANUAL

[. . . ] As you learn how to use this transceiver, you will also find that KENWOOD is pursuing "user friendliness". in Menu mode, you will see scrolling messages on the display that tell you what you are selecting. Though user friendly, this transceiver is technically sophisticated and some features may be new to you. Allow the manual to guide you through the learning process now, then act as a reference in the coming years. SUPPLIED ACCESSORIES After carefully unpacking the transceiver, identify the items listed in the table. [. . . ] Then, press [+]/ [] to select the band you want to operate. 54 REJECTING INTERFERENCE DSP FILTERS KENWOOD digital signal processing (DSP) technology is used for the functions described in this section. Using DSP filtering, the TS-690S frees you from installing many analog filters for each operating mode. Additionally, you can control the bandwidth, cancel the multiple jamming beat, and reduce the noise level using DSP filtering technology. Mode SSB/ FM AM Default low-cut frequecy (Hz) 300 100 Default high-cut frequency (Hz) 2600 5000 4 To return the display to the current operating mode, press [DISP]. Note: x The cut-off frequencies can be adjusted independently for each operating mode. When you change the operating mode, the previous setting is recalled for each operating mode. Switch the Packet filter OFF to adjust the DSP filter bandwidth. CHANGING THE RECEIVE FILTER BANDWIDTH For improving interference reduction capability, this transceiver also provides IF filters designed using DSP technology. 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 filter bandwidth does not affect the current receive frequency. Note: x The receive filter bandwidth can be changed only on the main transceiver. x The IF DSP filter is not available in FM mode. s CW/ FSK Modes 1 Press [CW/ FSK/ REV] to select CW or FSK mode. 3 Turn the LO/ WIDTH control clockwise to increase (wide) the bandwidth, or counterclockwise to decrease (narrow) the bandwidth. s SSB/ FM/ AM Modes 1 Select SSB, FM, or AM mode. 1 is ON, you can further adjust the noise reduction level by pressing [FUNC], [N. R. / LEVEL], then turn the MULTI/ CH control to select the level from 1 to 9 or AUTO. 2 Time Constant You can change the correlation time for Noise Reduction 2 (SPAC). When in SSB mode, select the correlation time that allows you to hear signals with more clarity. When receiving CW, it is best to select the longest correlation time that allows reliable reception. 2 is ON, press [FUNC], [N. R. / LEVEL], then turn the MULTI/ CH control to select the correlation time from 2 ms to 20 ms. The default is 20 ms. Note: x Using Noise Reduction 2 in SSB mode may lower the clarity of signals or induce pulse noise, depending on the conditions. However, the level cannot be adjusted. AUTO BEAT CANCEL (SSB/ AM) Auto Beat Cancel uses an adaptive filter and attenuates more than one cyclic interference within the receive pass band. The adaptive filter changes its characteristics according to the nature of the signal being received at any given moment. You can use automatic Beat Cancel when in SSB or AM mode. Receive pass band Interfering tones Desired signal Before After Press [B. C. / MANUAL] to toggle between the Auto Beat Cancel ON and OFF. If desired, you can manually control the beat cancel frequency. 56 12 REJECTING INTERFERENCE NOISE BLANKER Noise Blanker was designed to reduce pulse noise such as that generated by automobile ignitions. "NB" appears when the function is ON. ATTENUATOR The Attenuator reduces the level of received signals. [. . . ] 50A) is ON, 00: WIDE, 01: NAR Answer S L SM Set Reads the S-meter status. 1 2 3 4 5 6 7 8 9 10 1 Read 2 3 P1 3 P1 4 ; 4 P2 5 6 7 8 9 10 S 1 M 2 5 P2 6 P2 7 P2 8 ; 9 10 Parameters: P1 0: Main transceiver 1: Sub-receiver 2: Main transceiver S-meter level 3: Sub-receiver S-meter level P2 Meter readings 0000 ~ 0030 (Main transceiver) 0000 ~ 0015 (Sub-receiver) Answer S M SQ Set Sets and reads the squelch level. 1 2 3 P1 3 P1 3 P1 4 P2 4 ; 4 P2 5 P2 6 P2 7 ; 8 9 10 5 P2 5 6 P2 6 7 ; 7 8 9 10 8 9 10 S 1 Q 2 Parameters: P1 0: Main transceiver 1: Sub-receiver P2 Squelch level 000 ~ 255 Read S 1 Q 2 Answer S Q SR Set Resets the transceiver. 1 2 3 P1 3 4 ; 4 5 6 7 8 9 10 5 6 7 8 9 10 Parameters: P1 1: VFO reset 2: Master reset S 1 R 2 Read 1 Answer 2 3 4 5 6 7 8 9 10 SS Se t Sets or reads the Program Scan pause frequency. [. . . ]