I got this from the Heathkit Listserver, and thought it might be worth passing on.

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Check 3.525 and 3.558 in the FM mode for telephone modem signals. A couple years ago discount stores and cable companies sold these modems which plug into a wall receptacle and transmitted for miles. You plug your phone into one and located a second unit in another room or garage to extend your phone line without wires. These are manufactured in China and are intruding into the ham bands again. If you hear these signals report your log to the ARRL at w1aw@info.org Cable companies recalled these units and the 80M band was free again of these signals. Now they are coming back...we could use your help. Make your log report short with a signal strength report and times. If you listen long enough you will be able to hear two way phone conversations. I found my neighbor using one and told her about all the gossip I overheard and she quickly unplugged the units. Dan, ni9y@arrl.net