The "Lojack" units listen on the same frequency the transmit on. If your
hearing one every 60 seconds or so, your hearing a base station polling the
mobiles. Lojack has two transmit modes...every 10 seconds and once a second.
Transmit rate is stepped up once a law enforcement unit picks up the
alphanumeric beacon. Local FM SCA carriers have NEVER been used to control
anything with Lojack.
The Lojack transponder is activated ONLY after the car is entered as a
"Stolen" in the database....Eddie

"john wilson" wrote in message
...
In Virginia there are 4 licensed lojack tower operations. ALL are
located on
the north/south I95 corridor. So if one steals a car so equipped avoid
I95.
Some VSP cars have Lojack equipment and it does work. I recall more than
one
occasion hearing of stolen vehicles triggering the VSP lojack receivers
and
catching the crooks. The VSP lojack equipped cars in addition to the
other
antennas have 4 vhf 1/4 wave vertical antennas cut for 170 mhz. They
serve as a
crude form of direction finding.

Leonard Jenkins wrote:

I frequently monitor the nationwide (well, major cities)
Lojack frequency of 173.075 Mhz here in Norh Miami, FL...

From time-to-time I can hear (fairly strong) a burst of data, about
a quarter of a second long, and repeats approx once a minute.

Their website states that Lojack beacons are activated from transmitters
placed on "Police Radio Towers".
But I recall once reading that they are activated via local FM Broadcast
stations by means of signalling on the SCA.

Can anyone confirm or clarify this?

I would suspect that Lojack tells the public that activation is from
the "Police Radio Towers" to give the public that "Warm and fuzzy,
confident"
feeling...

Does anyone know if ANY activity heard on 173.075 is indeed activated
Lojack devices, or maybe am I hearing messages being sent out to
activate
the units ?

Can anyone share any experiences of having reported to their police,
sheriff,
or state highway patrol, reception of a activated Lojack?

Are there any law enforcement officers that can comment what a activated
Lojack would sound like?