Carrier current refers to any modulated signal that is above the 50 or 60
Hz power-line frequency, but below the AM broadcast band. However, there
is a bit of a wrinkle here because if a VHF transmitter uses the
power-line as part of an antenna then technically it could be considered
a carrier current system even though the operational frequency if much
higher.
From a general technical definition a "carrier current" signal
is one which is DESIGNED to confine a MODULATED signal between the power
line frequency and the low end of the broadcast band, AND with one of the
design goals being that the signal travels down the untuned power lines,
phone lines, etc. The goal is to introduce the signal into an untuned
conductor, as opposed to a tuned antenna. The power-line is used as a
signal path, and not a transducer or antenna to radiate the signal into
free space.
From a practical perspective the area between 30 kHz and 400 kHz has
historically been used for CC bugging devices, but never confine you
search to just that frequency range. Instead search the power lines,
CATV, phone and other wiring for all signals/any signals for base-band
(un-modulated) audio or video, and modulated audio, video, or telemetry
from 9 kHz to at least 200 MHz.
-jma
At 09:21 AM 12/29/2006, Its from Onion wrote:
thanks Dan, I knew those buggers
would be hard to squash.
Any idea where you would get the freq's?
- ----- Original Message -----
- From:
taylo..._at_yahoo.com
- To:
TSCM-..._at_googlegroups.com
- Sent: Sunday, December 24, 2006 4:13 PM
- Subject: [TSCM-L] Re: Thermal Camera Safety Check
- vlf and very little signal is radiated into free space,and yes the
radio shack devices are often removed from there cases and built in to
innocuous objects.
-
- dan
- taylor group
- Its from Onion
<areda..._at_msn.com>
wrote:
- ok. now I'm confused. carrier-current bugs use the AC
line to 'transmit the signal.
- does this equipment receive EMF signal radiated from the AC
wire?
-
- What frequencies are most of these bugs at? Do they have
channels like 2.4 Ghz cameras?
-
- Does not the Radio Shack X-10 system controllers work on this
technology?
-
- Let me say this first....or last, aint looking for gov or law
enforcement bugs.
-
- Thanks again and Merry Christmas...
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Received on Sat Mar 02 2024 - 00:57:26 CST