Kenwood R-5000 User Handbook Manual

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Contents

OPTIONSIF FILTERSAdding filters of different bandwidths will help you receive signals in a crowded signalarea. The smaller the bandwidth, the less a signal on an adjacent frequency can interfere withyour frequency of interest. Every type of signal has a certain bandwidth: usually 4 to 6 kHz forbroadcast, 3 kHz for SSB, and 150 Hz for CW. If you use a CW filter of 500 Hz to receive abroadcast station with 6 kHz bandwidth you will be cutting off most of the signal - not a goodidea. A 1.8 kHz filter will work great in SSB mode because it is just wide enough to let onesignal through while filtering out adjacent signals. Adding filters will improve your ability to rejectadjacent interfering signals and pull in those weak ones.The R-5000 will accept up to four filters of varying bandwidth. The filters are selected inseries, with the overall bandwidth being determined by the narrowest filter used. The front panelSELECTIVITY switch gives the operator the choice of four bandwidths: N, M1, M2, W or AUTO.In FM mode, the SELECTIVITY switch does not work, as the receiver has a fixed 12 kHzbandwidth in FM mode.FILTER TYPESThe narrowest filter must be installed in the N position, with M1, M2, and W holdingfilters of increasing bandwidth. The N position is where a narrow CW filter like the 500 HzYK88C filter would be installed. There is also a 270 Hz CW filter, the YK88CN, for the CWenthusiast. M2 is where the "stock" 2.4 kHz SSB filter (YK88S) is installed from the factory.There is also a 1.8 kHz SSB filter, the YK88SN, for the SSB work. The W position is where the"stock" AM filter is installed. This is a very poor quality filter, and the first thing you should do isreplace this filter with the 6 kHz AM filter YK88A1. There are also a couple of "custom" AMfilters with 4 kHz and 6 kHz bandwidths that offer better performance for DX.In the AUTO position, the bandwidth is automatically selected by the receiver dependingupon the mode selected. The following chart shows how the bandwidth is selected according tothe mode:SELECTIVITY MODEW AMM2 USB/LSBN CWN FSKYou'll notice that the M1 filter is not selected automatically, and can only be selected by the M1position of the SELECTIVITY switch.For a "full-up" shortwave broadcast selection, you can replace the stock AM filter withthe YK88A1 filter in W, a custom 4 kHz filter in M2, move the YK88S to M1, and the YK88C inN. If SSB is your specialty, then try the YK88A1 in W, the YK88S in M2, the YK88SN in M1, andthe YK88C in N. Try the YK88A1 in W, the YK88S in M2, the YK88C in M1, and the YK88CN inN for CW work.8