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Cellular Phone via T.V.
DO NOT TRY THIS AT HOME : Rotteneggs.com text files and message bases are for INFORMATIONAL PURPOSES ONLY. DO NOT undertake any project based upon any information obtained from this or any other web site.We are not responsible for, nor do we assume any liability for, damages resulting from the use of any information on this site.
(48 votes)
Published: Apr 20, 2005 4:38 a.m.
Viewed 672 times

1. Background--Cellular phones occupy 824-848 Mhz (mobile) and 869-894 Mhz
(base). FM is used and channel spacing is 30 Khz. Mobile/Base spacing is 45
Mhz. These frequency bands were formerly occupied by UHF-TV Channels 72-76 and
80-83+. Shouldn’t a TV be able to pick up these signals?????

2. Connect an antenna to the UHF terminals of a TV. If a UHF antenna is not
available, just use a piece of wire about a foot long with the ends connected
to the two UHF terminals.

3. Turn on the TV and turn up the audio gain (TV’s use much wider deviation).
Slowly tune around channels 80 and 83. Occasional audio should be heard, but
because the TV audio section requires a 4.5 Mhz signal, audio will be heard
only when two cellular channels about 4.5 Mhz apart are active.

4. A second TV (assuming higher local oscillator and about 45 Mhz IF) could
provide the necessary hetrodyne so that the first TV can detect a single
incoming signal.

a. Tune the first TV (with UHF antenna) to channel 82 (80-83).

b. Bring the second TV as close as possible to the first and slowly tune
it around channel 75 (72-76), until audio is heard...or

c. Retune by small increments...set the first TV, then sweep the second
etc.

5. DISCLAIMER!!!!! Try this at your own risk......don’t know the
legalities/illegalities of listening to cellular phones...... 		 
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Runtman_444
Apr 20, 2005 10:34 am -
Dude, If this works, that would be great. 5 stars. Very well written up.


Pooter
Apr 20, 2005 2:13 pm -
looks copied but very cool. 5 stars
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