Bart Bailey wrote:

In

posted on Mon, 26 Nov 2007 16:49:05 -0800 (PST), tom k in L.A. wrote:
Begin

what are those jet-engine type sounds i hear on certain frequencies?
it's not static, it's a tuned signal, but sounds like a jet engine.
thanks.

If you're talking about in the international shortwave bands, it could
be jamming, birdies, facsimile or any number of things, but if it's in
the AMBCB it's likely the IBOC-HD component of an adjacent station.

Still waiting for him to post some frequencies so that one might check it out...