Jim,
48074 is the TEN-TEC part number for the 2.4 Khz standard SSB filter in
the 2nd IF at 6.3 MHz. The 85-10 is the date code. Probably means
October of 85. The other filter is 48075 part number which is a model
288 optional narrow SSB filter ( 1.8 KHz ) which should be installed in
the next slot. Again 88-05 is the date code. The NS is as Clark says,
the manufacturer. What? You did not know TT did not make there own
filters? Well you are not alone on that one.
73, and enjoy the fine radio
Jerry K8JRO
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