HFU HF Underground
Loggings => Utility => Topic started by: SW-J on December 13, 2011, 0344 UTC
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Just noticed it tonight ... strong signals into DFW area ...
No idea what system or service these transmissions are associated with, but, the spectrum is normally marine.
Also, using Spectran, the following characteristics were noted:
Occupied BW: 650 Hz .. 2850 Hz (Rcvr IF BW set for 3 kHz, Rcv freq = 2.000 MHz)
Startup (training sequence) carriers:
790 1090 1160 1460 1760 1840 2130 2430 2510 2810
OFDM data carriers every 60 Hz (yeah, I know: line rate) or so ...
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Also heard here north of DFW on my Degen portable using whip ant.
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Also heard here north of DFW on my Degen portable using whip ant.
Noted it was absent about the 6:50 AM CST time frame in the morning ... maybe more distant than TX or LA or AR?
Should also add: heard several brief 'carriers' maybe a 1 kHz tone modulating a SSB transmitter, in that same range while listening to this 'service' ... kind of unusual for a service, indicates that maybe radio engineering personnel or technicians are on-site performing some testing, maybe an antenna testing, so, maybe this is something under development or newly installed?
Began working some 160 Meters starting mid-summer this year on the high end and this has been the first time I really noticed this 'service' ... anybody have more info chime in!
There is this regards Part 80 Maritime Services from the FCC:
http://frwebgate.access.gpo.gov/cgi-bin/get-cfr.cgi?TITLE=47&PART=80&SECTION=373&TYPE=TEXT
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