All, The RFI problem has been resolved. It turned out to be a charger for an electric motorbike left on cycle mode. The power company investigator left a note on my door explaining what it was. I don't have the details as to what kind of motorbike or charger, but I will pass that information along when I get it. The owner of the motorbike (a neighbor located 500 feet from me) unplugged the charger.
It was nice to turn on the HF rig and not hear that noise. The issue was taken care of within 48 hours thanks to LIPA inspector Mike Malinowski (N2QOY). I also received an e-mail from local ARRL Section Manager Tom Carruba (KA2D) and ARRL Technical Coordinator Steve Barreres (K2CX) offering their assistance. Good to know we're not alone. I have a recording of the noise and can e-mail the file if anyone would like to hear it. Thanks to all -- please reply direct. Tony -K2MO