Mark asked:

Tong Tong Ting. Tong Tong Ting?

Well, I heard it as "Tong Tong Tong Ting."

That's the VOA transmitter in Delano, California
targeted at Central America stepping on the
tail of the Montsinery (French Guiana?)
transmitter targeted at the Caribean.

Maybe I'm remembering Cold War era broadcasts but all the VOA stuff
I've heard had Yankee Doodle at the beginning of the broadcast.

Up here in Seattle, it stomps the hell out of 5975
for the last 5-7 minutes of the 02:00 hour,
when they warm the transmitter up and
then send the tones. Montsinery has been S9
and Delano us usually 10 dB stronger.

It's not nearly as bad here on the East Coast - Usually the BBC
broadcast has little to no noticable QRM. Given your proximity I can
see how the situation is reversed!

Now I gotta figure out why I hear number stations underneath several of
the Okochobee broadcasts!
(That's not an easy feat, they are almost local.)

Tim.