Tracking chips in HD radios
 

"David Eduardo" wrote in message
et...

wrote in message
oups.com...

You have no proof that this story is a lie


There are simple ways to tell a receiver is radiating. The HD receivers do
not radiate.

..... should have added "beyond the normal very short range radiation of any
receiver" There is no signal tha tcould be captured miles away

Tracking chips in HD radios
 

On Apr 1, 3:29�pm, "David Eduardo" wrote:
"David Eduardo" wrote in message

et...



wrote in message
roups.com...

You have no proof that this story is a lie

There are simple ways to tell a receiver is radiating. The HD receivers do
not radiate.

.... should have added "beyond the normal very short range radiation of any
receiver" *There is no signal tha tcould be captured miles away

Not, if it has a transmitter - Arbitron may be a secret investor in HD
Radio, as previously indicated. There is talk of HD Radio being a two-
way service - not problem transmitting addional information back.
Whoopie - let's do some shopping on our HD radios ! HD Radio is a
farce !

Tracking chips in HD radios
 

On Sat, 31 Mar 2007 20:47:23 GMT, "David Eduardo"
wrote:


"David" wrote in message
.. .
On 31 Mar 2007 11:02:47 -0700, "ve3..." wrote:


In WWII Nazi submarines used TRF receivers as the oscillator in a
superhet put out enough signal that air and naval sub chasers could
home in on the signal and deep-six them.
Except that TRF receivers have no oscillators. The reason the military
like TRF radio's is absent any oscillator, they don't emit anything to
give away position or frequency....



In fact, there is a ratings service, called MobilTrak which installs
antennas on utility poles where cars go by, and can tell what FM station is
being listened to based on the IF offset, but it does not work on AM.
Works only until someone decides to build an FM receiver with an IF
somewhere other than 10.7 Mhz....

http://www.mobiltrak.com/ has an explanation of the technology.

Mostly, this is used by retail business to see what station is listened to
at point of purchase (POP) for ad effectiveness studies. It is of limited
value in quantifying audience, as 2/3 of radio listening is not in the car.

Tracking chips in HD radios
 

On Sun, 01 Apr 2007 20:21:15 GMT, matt weber
wrote:


Works only until someone decides to build an FM receiver with an IF
somewhere other than 10.7 Mhz....


http://www.gnu.org/software/gnuradio...ck-diagram-fig

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