Similar signals have been seeing in San Diego.
The FCC San Diego office has been notified and are following the trail. We have been seeing them for the passed 5 or 6 months. If my memory serve me correctly, N6LR is the individual that is working with the FCC but don't hold me on that call.
The FCC ask us for bearings by pointing our beams for maximum S meter reading. They triangulated the position to be north of San Diego. However, we have being seeing it on the edge of 6..9 - 7.0MHz with what we are calling the widest part and to the right, what appears to be some type of modulation penetrating all the way up to 7.050MHz or higher.
Check with your local FCC office and mentioned the above example. They properly will contact the San Diego office.
By the way, this is NOT a Flex problem. We had a lot of help with the rice box users: Since they also were being affected.
This is a follow up to my previous note.
I received the following letter from Larry N6NC (see I came close to the correct c/s! I only missed it by two letters.)
"We got to the point of triangulating the signal as skywave (long distance, not local) from the north direction from La Jolla, FCC field guy referred the matter to their national fixed triangulation station, and the FCC boss for San Diego cancelled the request saying we should contact the FCC's interference lady in Washington - basically blowing us off."
Hope this answers the question and how far you are going to go!
"Government at its best"
Regards, Al / NN4ZZ
al (at) nn4zz (dot) com
Found a photo online of what it looks like: http://www.radiohobbyist.org/blog/?p=890