Questions came up in a discussion with a friend of mine who is considering
the INRAD roofing filter mod for his Kenwood TS-950SDX. He operates almost
100% CW, and doesn't hear any IMD products. His beef is noise from stations
that are just outside the passband of his cascaded IF crystal filters. He's
hoping the roofing filter will increase the selectivity of the radio.
73, Dick WC1M
Dick:
The question is the source of this noise - it could well be reciprocal
mixing from the 1st LO in which case no post-mixer filtering is going to
fix the problem. This is exactly how reciprocal mixing appears to the user.
Until the noise origin is pinned down, it's not possible to state with
certainty that a narrower high IF filter will do anything.
Jack K8ZOA
www.cliftonlaboratories.com
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