47 lines
1.9 KiB
Plaintext
47 lines
1.9 KiB
Plaintext
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Date: 26 Oct 89 15:32:00 GMT-10:00
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From: "NORMAN FUNAMURA" <nfunamura@nuwes-lll.arpa>
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Subject: Cellular Phone via T.V.
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1. Background--Cellular phones occupy 824-848 Mhz (mobile) and 869-894 Mhz
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(base). FM is used and channel spacing is 30 Khz. Mobile/Base spacing is 45
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Mhz. These frequency bands were formerly occupied by UHF-TV Channels 72-76 and
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80-83+. Shouldn't a TV be able to pick up these signals?????
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2. Connect an antenna to the UHF terminals of a TV. If a UHF antenna is not
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available, just use a piece of wire about a foot long with the ends connected
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to the two UHF terminals.
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3. Turn on the TV and turn up the audio gain (TV's use much wider deviation).
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Slowly tune around channels 80 and 83. Occasional audio should be heard, but
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because the TV audio section requires a 4.5 Mhz signal, audio will be heard
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only when two cellular channels about 4.5 Mhz apart are active.
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4. A second TV (assuming higher local oscillator and about 45 Mhz IF) could
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provide the necessary hetrodyne so that the first TV can detect a single
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incoming signal.
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a. Tune the first TV (with UHF antenna) to channel 82 (80-83).
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b. Bring the second TV as close as possible to the first and slowly tune
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it around channel 75 (72-76), until audio is heard...or
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c. Retune by small increments...set the first TV, then sweep the second
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etc.
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5. DISCLAIMER!!!!! Try this at your own risk......don't know the
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legalities/illegalities of listening to cellular phones......
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73 Norman
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KH6R
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-----------------------------------------------------------------------------
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The above information is _distributed_ by control team international.
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= ) gReAt pUdArKuS..303-427-0621 ~ 14.4 HST 240MB ~ dEnVeR ( =
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= ) eAgLeS nEsT.....46-18-264190 ~ 14.4 DS 370MB ~ sWeDeN ( =
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= ) dAtA c0nTr0l....818-558-5636 ~ 16.8 DS 200MB ~ LoS AnGeLeS ( =
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