Strange sound on Shortwave

This was heard tonight between 4840 - 4880 kHz.
Anyone who knows what this can be.






This morning I was told that it is CODAR, a worldwide network
of stations to monitor the wave height of the oceans.
Link:CODAR

33.42 mHz WQDC703 - Orlando / Florida

The TA mediumwave conditions are very average at the moment
and I was told that the DX is now on 30 - 36 Mhz.
Therefore I decided to build a multiband Inverted-V
for 33,38 and 43 mHz.

This afternoon I tried to catch some DX on Low VHF.
I heard a lot of Spanish Taxi dispatchers around 30 Mhz
and tuning a bit higher I heard this weather station on 33.42 mHz.

The National Weather Service from Melbourne, FL.
Every couple of minutes a recording over the top of the Weather Service says
"This is WQDC703 1650 AM. This is the City of Orlando Office of Emergency Management. Stay tuned for the most updated weather conditions from the National Weather Service in Melbourne."
The distance between my location and the transmitter location
of 33.42 MHz is 7402 km.



US National Weather Service Melbourne Florida

11 November 2011 BIG tropo to Sweden

Excellent tropo conditions to Sweden yesterday.
Good tropo is very rare nowadays so this one was very welcome
and Mr. Hepburn had it right this time.
The most distant transmitter logged was Mora at 963 km.
This was heard from Sweden and a few stations from Norway:

87.60 NOR NRK P1, Nordhue
87.60 S SR P1, Visby
88.50 S SR P1, Borås/Dalsjöfors
89.40 S SR P1, Borlänge
89.50 S SR P4, Hörby
89.80 NOR NRK P1, Kongsvinger
90.10 S SR P1, Finnveden
90.40 S SR P1, Varberg
90.70 S SR P1, Västerås
90.90 S SR P1, Sunne
91.20 S SR P2, Halmstad
92.20 S SR P1, Mora/Eldris
92.50 S SR P2, Kisa (Kinda)
93.00 S SR P1, Emmaboda
93.10 S SR P2, Uddevalla
94.20 S SR P2, Finnveden
94.60 S SR P2, Borås/Dalsjöfors
94.70 S SR P3, Vislanda
95.50 NOR NRK P2, Kongsberg
96.50 DNK DR P4, København-Gladsaxe
97.00 S SR P3, Hörby
97.00 S SR P3, Hörby
97.30 S SR P4, Halmstad
98.80 S SR P3, Varberg
99.00 S SR P3, Nässjö
99.60 DNK DR P3, Næstved
99.70 S SR P3, Emmaboda
100.00 NOR NRK P2, Oslo
101.00 S SR P4, Vislanda
101.00 S SR P4, Mora
101.00 NOR Radio Norge, Bjerkreim
101.30 S SR P4, Borlänge
101.30 S SR P4, Borlänge
101.90 S SR P4, Göteborg
102.00 NOR Radio Norge, Lyngdal
102.90 S SR P4, Borås
103.90 NOR Radio Norge, Oslo
104.20 S Mix Megapol, Halmstad

105.20 NOR Radio Norge, Skien
106.50 NOR Radio Norge, Nordhue