detect tv channel frequency

yeah.. you are right abhishek, the DTH channels are coded and you need a special authorization key to decode that data.. its encrypted...
and whatever i explained in my last post is actually for cable TV. But why SHYAM is behind all this? please tell us about your project..

well the project is something related to the trp rating of tv channel.
I have obtained a project from a leading tv serial company,
they want to place my device along with the tv set, in the homes of
people of different sectors of society.
now i have to use the device as a data logger and record the channel frequency that is being tuned
at various time.
as i already said the first part has been done by placing an rf probe over the tuner card ,inside the tv, now i wanna do it without opening the tv.

oo... nice..
shyam.. this site is for students i never discuss company projects

yes ajay you are right,
but i am ready to make the project open right from the hardware to the software part.
may be some of the students too would find it interesting.
moreover this is totally my idea , no committment as such to the company.
All i want is to make this thing work.

well... i like open source projects.. and sure i am helping you.. well must say... your project is interesting.. and its good to log which channel is being watched more and at what time good statistical tool

i am attatching the diagram of the rf probe used.
the probe is working fine when placed above the tuner card of tv

the probe can be interfaced to an 8051 cpu or ARM (lpc21xx).
the input is to the adc and the voltage can be decoded to get the actual frequency detected.

if it is required i can post the 51 cpu schematic too

will be great if you can post hey i will add this completed project in the site.. of course with ur name

hi folks,
my problem is still not solved ,
by (schematic submitted) the rf probe,
i can detect channel frequency but the probe has to placed inside the tv over the tuner card.
how can i do it from outside the tv??

did you try it on the wire? that goes from set top box to TV?
check if its showing you some results!?!

do you have a PCB for this probe?