Kenwood TS-990S Service Manual
Also see for SP-990: Instruction manual
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TS-990S23CIRCUIT DESCRIPTION4-7. IF FilterThe IF filter includes multiple analog filters in addition toa DSP digital filter in the IF stage to have sufficient tolerancefor unnecessary signals (Refer to Table 15).In the SRX-1 path with enhanced the resistance to theinterference due to nearby strong signals, the MCF (XF351)and crystal filters (XF485 and XF486) are mounted in the1st IF (11.374MHz) line. The MCF (XF401) is mounted in the1st IF (73.095MHz) line, the crystal filter (XF484) or MCFs(XF481 and XF482) are mounted in the 2nd IF (10.695MHz)line, and the ceramic fi lters (CF601 and CF602) are mount-ed in the 3rd IF (455kHz in FM mode only) line of the SRX-2path.Table 16 shows the relationship between the types ofDSP fi lters selectable and their corresponding roofi ng fi lters.The IFBW of a roofing filter showing the bandwidth of theroofi ng fi lter, and is set according to Table 16.Item XF351: L71-0656-15 XF485: L71-0657-05 XF486: L71-0658-05Nominal center frequency 11.374MHz 11.374MHz 11.374MHzPass bandwidth BW 6.0kHz or more at 6dB BW 2.7kHz or more at 6dB BW 500Hz or more at 6dBAttenuation bandwidth fo±35.0kHz or less at 60dB BW 8.0kHz or less at 60dB BW 1.55kHz or less at 60dBRipple 1.0dB or less 2.0dB or less 2.0dB or lessInsertion loss 3.0dB or less 6.0dB or less Within 6.0±3.0dBGuaranteed attenuation 70dB or more at fo±1MHz 80dB or more at fo±1MHz 80dB or more at fo±1MHzCenter frequency deviation fo±500Hz or less at 6dB fo±150Hz or less at 6dB fo±150Hz or less at 6dBTerminating impedance 1.0k//6.0pF 900//9.0pF 100//90pFItem XF401: L71-0605-05 XF481: L71-0230-15 XF482: L71-0664-05 XF484: L71-0569-15Nominal center frequency 73.095MHz 10.695MHz 10.695MHz 10.695MHzPass bandwidth fo±7.5kHz or more at 3dB fo±7.5kHz or more at 3dB BW 6.0kHz or more at 6dB fo±1.35kHz or more at 6dBAttenuation bandwidth fo±35.0kHz or less at 40dB fo±25.0kHz or less at 18dB fo±35.0kHz or less at 60dB fo±3.1kHz or less at 60dBRipple 1.0dB or less 0.5dB or less 2.0dB or less 2.0dB or lessInsertion loss 3.0dB or less 2.0dB or less 3.0dB or less 6.0dB or lessGuaranteed attenuation 70dB or more at fo+(500~1000kHz)70dB or more at fo-(200~1000kHz) 30dB or more at fo±1MHz 60dB or more at fo±1MHz 60dB or more at fo±300kHzCenter frequency deviation fo±1.5kHz or less at 3dB - fo±1.0kHz or less at 6dB fo±150Hz or less at 6dBTerminating impedance 2.5k//-0.5pF 3.0k//2.0pF 1.2k//6.0pF 1.2k//7.0pFItem CF601: L72-0376-05 CF602: L72-0372-05Nominal center frequency 455kHz 455kHzPass bandwidth fo±4.5kHz or more at 6dB fo±6.0kHz or more at 6dBAttenuation bandwidth fo±10.0kHz or less at 50dB fo±12.5kHz or less at 50dBRipple 2.0dB or less 3.0dB or lessInsertion loss 6.0dB or less 6.0dB or lessGuaranteed attenuation 35dB or more at fo±100kHz 35dB or more at fo±100kHzCenter frequency deviation - -Terminating impedance 2.0k 2.0kTable 15 IF filter |
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