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Re: Large Flat Coil
Original poster: Mddeming@xxxxxxx
Hi Earl,
In a message dated 5/2/07 3:44:16 A.M. Eastern
Daylight Time, tesla@xxxxxxxxxx writes:
oh and what's so special about 455 khz
455KHz is the standard intermediate
frequency of virtually all AM receivers. This
means a signal on this frequency will interfere
with reception on any AM radio within range,
regardless of what station it's tuned to.
It's a big no-no. While a TC probably won't
broadcast for more than a couple of blocks, you
don't want a visit from the FCC DF truck or from
the Dept of Homeland Paranoids.
You will probably want to stay away from these frequencies too:
" DISTRESS FREQUENCIES
Several frequencies in different bands
are designated for the transmission of distress,
urgency, safety, or search and rescue (SAR)
messages. The
following frequencies have been designated
for use during a distress or emergency
situation: 500 kHz? International CW/MCW distress and calling;
2182 kHz? International voice distress, safety, and calling;
8364 kHz? International CW/MCW lifeboat, life
raft, and survival craft; 121.5
MHz? Inteernational voice aeronautical emergency;
156.8 MHz? FM United States voice distress and
international voice safety and calling; and 243.0
MHz? Joinnt/combined military voice
aeronautical emergency and international
survival craft. During SAR missions, the
following frequencies are authorized for use:
3023.5 and 5680 kHz? International SAR>
frequencies for the use of all mobile units at
the scene of a search. Also for use of shore
stations communicating with aircraft proceeding
to or from the scene of the search. CW and voice are authorized.
123.1 MHz? International worldwide voice SAR use.
138.78 MHz? U.S. military voice SAR on-the-
scene use. This frequency is also used for direction finding (DF).
172.5 MHz? <U.S. Navy emergency sonobouy
communications and homing use. This
frequency is monitored by all U.S. Navy ASW
aircraft assigned to a SAR mission. 282.8 MHz?
Joint/combbined on-the-scene voice and DF frequency used throughout NATO. "
Matt D.
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