On Thu, 1 Sep 2005 07:50:29 -0500, "PowerHouse Communications"
wrote:


"Al Klein" wrote in message
.. .
On Sat, 27 Aug 2005 19:39:32 GMT, Hogger said in
rec.radio.scanner:

As far as specifically tracking someone RECEIVING radio frequencies,
I'm not familiar with any piece of equipment capable of doing that.

If such a device existed, I have no idea how it would differentiate
someone's AM/FM stereo, wireless router, baby monitor, coordless
phone,or garage door opener from a scanner. (Yes, I know, some of
them transmit.. and that can be detected.. I mean from the "receiving"
point of view, for example.)

By the frequency of the local oscillator, but that's very iffy as
legal evidence.


detecting people " receiving " signals is a time honored tradition
and process dating from before WWII to present times. besides the
" detector detectors " mentioned below , cable companies have been
finding service theft cases from listening to their " local
oscillators " and making legal cases against them. if those people
are listening to channels ( indicated by the radiated local
oscillator freqs ) that their converter isn't authorized to receive ,
then that constitutes theft of service conditions. ( the cable company
sends out signals that normally " locks out " those channels )
since there are slight variations in each piece of equipment, the
cable company can tell how many converters you have on-line too .
way back in WWII, radio receivers were illegal in England. trucks
with directional receiving equipment drove through the streets
locating receivers ( of spies , they hoped ) via their local
oscillators.
Al, all the equipment you mention above, transmits ( inadvertently
) LO type signals on " completely " different freqs and of differing
types, that signal their presence. equipment commonly exists that
can locate most of them from several blocks to several miles distant.
ANY well made piece of government RF surveillance equipment ( WJ
blk boxes for instance ) has been designed to do just " exactly " that
for decades.
modern types are totally computer automated and can " describe a local
RF environment " ( scan everything and project the type and number of
ALL RF devices present within a certain radius ) in just minutes. the
computers can analyze " lo " signals and project ( based on known
computer model algorithms ) the exact types and numbers of equipment
present. they can ( and do ) scan for protracted periods of time and
constantly update the report status.

I have a home made ( new voodoo technology for civilians ) ferro
resonant core ULF sensor ( parts and sample circuits available from
this site http://www.stormwise.com/vlf1574projects.htm )
) set up on the roof rack of my SUV that can " hear " the RF
radiation " clicks " of a new memorex shirt pocket solid state
dictation / voice memo machine , a block and half down the street.
the so called signal from this device is " extremely " small but
easily detectable using the new technology ( government has had them
for decades ) ferro rods . ( completely NEW type of resonant circuits
as compared to past RF devices . THESE need NO caps or circuitry
as we used to know it, they are " self resonant " and the " circuits "
are just pick off coils like the 2 turn tap in a pi-net to
extract the signals these rods accumulate )

http://www.tscm.com/tmdedemod.html




Well, it doesn't seem too iffy in Virginia and D.C. They use devices (VG2
detectors) that pick up local oscillator frequencies in radar detectors, and
have no problem using it for legal evidence...



hay Al, where you been ..... been a while since I saw you around ?
should come back and stir stuff up more often ... ah ah ahah ah aha h!



k.........