Camera Mics in Police Cars
 

Does anyone know the frequency that the Camera Mics in Police Cars use?

JAMEZY NJ wrote:

Does anyone know the frequency that the Camera Mics in Police Cars use?



You must have been watching the news............

They are hard-wired to the recorder in the trunk of the car. Started at the
beginning of watch, checked in at the end of the watch or shift.
Neither the audio or video are transmitted from the vehicle. This is for the
regular patrol cameras.
For the "Covert" installations..thats a differant story. Law enforcement
agencies can (and DO) use ***ANY*** frequency they please on a
non-interfering basis with the primary licensee. That means if your local
police dept wants to conduct a surviellance on the channel normally used for
the school district's car to car channel they can.
Frequencies they wont use....HAM or Amatuer, CB..(27 and 462/467)all classes
due to interferance.They will not use the 5 MURS channels due to
interferance.They will not use FRS.They tend to NOT use any "IB" frequencies
due to interferance and being overheard.Local Law Enforcement will not use
the 136-143Mhz military band.
Frequencies they WILL use.....Federal assignments(see 406-420Mhz and
162-172Mhz),Aircraft channels from 118-136Mhz AM(high altitude
surviellance), neighboring law enforcement's assigned channels.Local
NON-USED television channels!!! yeah..you heard right. If TV channel 8 is
not used in your area its a perfect place to hide a narrow band FM planted
mike.( no high power stuff,typically 100mw.) TV audio is 25Khz wide and even
if your on top of the mike...with it's 3-5Khz wide audio you wont hear much.
Hope this helps....happy monitoring!...Eddie

"JAMEZY NJ" wrote in message
...
Does anyone know the frequency that the Camera Mics in Police Cars use?

FIRST OF ALL i WASN'T WATCHING ANY NEWS PROGRAMS AS THE SOURCE OF MY ASKING.

The mics are not hard-wired. The officer wears a microphone on his shirt with
a wire that goes down to the tranmitter on his belt. The audible part is
transmitted back to the car.

I ask because the local police stop cars in front of my residence alot
enforcing the 25mph speed limit.

I just wanted to listen. I used to have it but lost the frequency when I
moved.

Search in the 166-175 mhz range. They are usually low power (less than a
watt). If that doesn't work, they may be of the 900 mhz variety.


Chris

Time to buy the Optoelectronics Scout !

jw
wb9uai

Does anyone know the frequency that the Camera Mics in Police Cars use?

and for that matter, does anyone know the frequencies the cameras in the police
cars use ?

I have an IC-R3.

so I figured I may as well ask in this thread.

Neither the audio or video are transmitted from the vehicle. This is for the
regular patrol cameras.
For the "Covert" inst

I guess that answers my question, and that I posted too soon.

or the "Covert" installations..thats a differant story. Law enforcement
agencies can (and DO) use ***ANY*** frequency they please on a
non-interfering basis with the

and I guess that answers the rest of my questions about it, also.

At least, it helped give me a lot more knowledge about it also besides just the
original poster.

Thats a sore spot about the Icom R-3 Video rcvr....it STOPS at
2.450Gigs....while the Television and law enforcement community are at 2.450
to 2.500Ghz!! Why Icom did that is crazy. ...Eddie


"Waterperson77" wrote in message
...
Does anyone know the frequency that the Camera Mics in Police Cars use?

and for that matter, does anyone know the frequencies the cameras in the
police
cars use ?

I have an IC-R3.

so I figured I may as well ask in this thread.

Thats a sore spot about the Icom R-3 Video rcvr....it STOPS at
2.450Gigs....while the Television and law enforcement community are at 2.450
to 2.500Ghz!! Why Icom did that is crazy. ...

I'm beginning to wonder if the law (FCC regulations or government reguations)
made them do that.

Because I read an archived newsgroup post that said something like

"make no mistake about it. This is by design so that you can not see these
frequencies".

How true that post is or not, I don't know.

But I can kind of imagine it being true.

and I don't really doubt that it's true.

although I can't say for sure.

"Eddie Haskel" wrote:

Thats a sore spot about the Icom R-3 Video rcvr....it STOPS at
2.450Gigs....while the Television and law enforcement community are at
2.450 to 2.500Ghz!! Why Icom did that is crazy. ...Eddie

"Waterperson77" wrote:

I'm beginning to wonder if the law (FCC regulations or government
reguations) made them do that. Because I read an archived newsgroup post
that said something like "make no mistake about it. This is by design so
that you can not see these frequencies".

How true that post is or not, I don't know.
But I can kind of imagine it being true.
and I don't really doubt that it's true.
although I can't say for sure.

United States Code (U.S.C.):
TITLE 18 PART I CHAPTER 119 Sec. 2510.

(16)
''readily accessible to the general public'' means, with respect
to a radio communication, that such communication is not -

(E)
transmitted on frequencies allocated under part 25, subpart D, E, or F
of part 74, or part 94 of the Rules of the Federal Communications
Commission, unless, in the case of a communication transmitted on a
frequency allocated under part 74 that is not exclusively allocated to
broadcast auxiliary services, the communication is a two-way voice
communication by radio;

http://www4.law.cornell.edu/uscode/18/2510.html ---

Part 74: Subpart F: Television Broadcast Auxiliary Stations
Sec. 74.602 Frequency assignment.

Band A MHz

2450-2467
2467-2483.5

(1) Frequencies shown above between 2450 and 2500 MHz in Band A are
allocated to accommodate the incidental radiations of industrial,
scientific, and medical (ISM) equipment, and stations operating
therein must accept any interference that may be caused by the
operation of such equipment. Frequencies between 2450 and 2500 MHz
are also shared with other communication services and exclusive
channel assignments will not be made, nor is the channeling shown
above necessarily that which will be employed by such other services.

http://tinyurl.com/2hkvb ---

18 USC 2510 declares that Part 74 frequencies are "forbidden" unless
they are Not Exclusive to Part 74, and it is not a voice communcation.
Part 74 Subpart F clearly states that 2450 to 2500 MHz are shared with
other sevices, and it's video, not audio. Therefore, it is NOT illegal
to intercept anything at 2450 and 2500 MHz. ------

PART 94 was removed and designated "Reserved" by order in Docket
No. 94-148, effective August 1, 1996. Part 101 has superseded Part 94.

PART 101_FIXED MICROWAVE SERVICES

Sec. 101.101 Frequency availability.
http://tinyurl.com/2ykxq

Sec. 101.109 Bandwidth.
2,450 to 2,483.5.......................... 625 KHz \2\
2,483.5 to 2,500.......................... 800 KHz
\2\ 1250 KHz, 1875 KHz, or 2500 KHz on a case-by-case basis.
http://tinyurl.com/2c6r2

Subpart H: Private Operational Fixed Point-to-Point Microwave Service
http://tinyurl.com/2pt5k

Subpart I: Common Carrier Fixed Point-to-Point Microwave Service
http://tinyurl.com/2m7qo ----

Scanners & Communication Recievers that tune to the 2.5Ghz band:

Yaesu VR-5000, AOR AR8600 Mark II, AOR AR5000+3B, & AOR AR8200 MK III.
Any others? Which antenna is the best for this application?