I think this database could be a lot more useful if it listed specific "birdie"
carrier frequencies and cross referenced to specific equipment or
equipment types that produce those frequencies.
For example, I've tracked down specific frequencies in several HF CW
bands that are produced by the 10BaseT Ethernet gear in my office. They
3511, 10106, 14029, 14030, 21052, and 28014. I'm sure there are other
frequencies associated with 10BaseT, but I'm a CW guy and this is what I've
I've also learned that much of this is radiated by the CAT5 cable as a
common mode signal, and that it can be significantly attenuated by winding
the CAT5 cable around a ferrite core to form a choke.
Jim Brown K9YC
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