Discussion in "Electronics" started by    SHYAM    Sep 12, 2007.
Wed Sep 12 2007, 09:35 AM
#1
can any body please suggest me a method to determine the frequency of a tv channel without changing the hardware of televesion??


tnx in advance
Tags detect tv channel frequency
Wed Sep 12 2007, 10:11 AM
#2
hi this may helpfull for you
Radio Frequency Spectrum
Frequency Use Cable TV Use
3-9 KHz not allocated
9-14 KHz long range navigation
14-535 KHz an assortment of fixed and maritime mobile radio, radio location, radio navigation, maritime radio navigation, aeronautical mobile, aeronautical radio navigation and mobile radio
535 KHz - 1.6 MHz AM broadcasting
1.7-54 MHz various amateur bands, shortwave broadcasting, industrial, scientific and medical usage, CB radio, and mobile radio
54-72 MHz TV channels VHF 2, 3, 4 Ch. 2-4
72-76 MHz Aeronautical navigation and astronomy
76-88 MHz TV channels VHF 5, 6 Ch. 5-6
88-108 MHz FM broadcasting Ch. 95-99
108-135 MHz aeronautical navigation and communication 120-174 MHz
Ch. 14-22
135-144 MHz space research, land mobile radio
144-148 MHz amateur radio
148-174 MHz land mobile radio, government fixed mobile, paging services
174-216 MHz TV channels VHF 7, 8, 9, 10, 11, 12, 13 Ch. 7-13
216-470 MHz an assortment of land mobile, amateur radio, government fixed and mobile radio, aeronautical, and marine radio 216-648 MHz
Ch. 23-94
470-608 MHz TV channels UHF 14 through 36
608-614 MHz space operations (there is no UHF 37)
614-806 MHz TV channels UHF 38 through 69
806-890 MHz cellular telephones
890 MHz - 3.5 GHz an assortment of radio location, land mobile and paging, aircraft navigation, amateur radio, aeronautical satellite, space observation, microwave ovens and maritime radio
3.5-4.8 GHz C band (Anik B, D, E) satellite downlinks
4.8-5.8 GHz various radio navigation
5.8-7 GHz C band satellite uplinks
7-8.5 GHz various uplinks and downlinks
8.5-10.7 GHz various radio navigation and location, including police radar
10.7-12.2 GHz Ku band (Anik B, C, E) satellite downlinks
12.2-12.7 GHz maritime radio navigation, and direct broadcast satellites
12.7-14.5 GHz Ku band satellite uplinks
14.5-275 GHz various EHF (extremely high frequency) allocations, many of them satellite usage
Tags radio frequency spectrumfrequency bandradio frequency bandextremely high frequencyradio navigation frequency
Wed Sep 12 2007, 10:49 AM
#3


can any body please suggest me a method to determine the frequency of a tv channel without changing the hardware of televesion??


tnx in advance

SHYAM



What do you mean by.. without changing the hardware? Please explain clearly..
Thu Sep 13 2007, 06:21 PM
#4
any idea to crack (info) DTH channel .i mean any one know what is channel selection procedure in DTH system


[ Edited Thu Sep 13 2007, 08:45 PM ]
Thu Sep 13 2007, 06:35 PM
#5
TPS you are a moderator.. you should not talk about cracking stuff and all
Thu Sep 13 2007, 07:05 PM
#6
i have detected the frequency by placing a rf probe inside the tv above the tuner card .
now i want to do it without opening the tv.
Thu Sep 13 2007, 08:38 PM
#7


i have detected the frequency

SHYAM


of channel frequency?
Thu Sep 13 2007, 08:47 PM
#8


TPS you are a moderator.. you should not talk about cracking stuff and all

Ajay


sorry , i used word "crack" instead of information i have corrected the post
Thu Sep 13 2007, 09:33 PM
#9
shyam, you need to make something like an auto tuner(like in Auto Tune FM), so when you get a good response signal that means you have got a channel and note the frequency. But i am not sure will this auto tune works without TV on or not.. i am sure it works.. after all its a frequency.

And... you can test this thing also using an FM radio as TV frequencies start from 55-68Mhz something.. and FM works from 88MHz, so if you're lucky you can listen to a channel sound..
actually i did this experiment with my CAR radio.. and it works
TV was on at that time
Fri Sep 14 2007, 06:18 PM
#10
it is possible to find the frequency of a channel. but in case of DTH, the data is decoded in some format so just finding the frequency is not enough. Have you noticed the time delay while changing channels? thats the time taken for decoding the data. ( that delay is constant. ie, DTH is 1-2 sec delayed compaerd to cable.) So even if u know the freq, its of no use. if you want to experiment with frequency, do it with cable service. I will try to post the pinout of the tuner module shortly.

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