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- ZDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDD?
- 3 ZDDDDDDDDDDDDDDDDDDDDDD? 3 How to Build Your Own Underground
- 3 3 . . 3 3 Television Transmitter
- 3 3 S n o w B o x 3 3 Using Commercially
- 3 3 . . 3 3 Available
- 3 3. 13-JUN-88 . 3 3 Parts
- 3 3 . 3 3 ]3:^3]33^3^::]3^:]^ ]^3]3^3]]^]
- 3 3 Outlaw Telecommandos 3 3 ]3:^3]33^3^::]3^:]^ ]^3]3^3]]^]
- 3 @DDDDDDDDDDDDDDDDDDDDDDY 3 ]3:^3]33^3^::]3^:]^ ]^3]3^3]]^]
- @DDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDDY 0 1 - 2 1 3 - 3 7 6 - 0 1 1 1
-
- Yes, for some time now it has been possible to construct a clandestine
- television station, which you can operate from your Telecommando Lair, or modify
- for Mobile Media Guerrilla campaigns.
-
- We have named this device the Snow Box, due to its cool nature, and the snow
- seen on blank television channels waiting to be commandeered.
-
- To put together a TV station you will need this stuff:
-
- A VCR or Camcorder with video or RF outputs
-
- A Ham Radio 6-meter Band Linear amplifier
- (This boosts the RF signal from the VCR for broadcasting)
- (The Linear Amp should have a bandwidth of 6 MHz for best results)
- A cable television RF distribution amplifier may also be used.
-
- Coaxial cable with UHF connectors
- (Connects the Linear Amp to the Antenna)
-
- A cable-TV patch cable with an F-connector and a UHF connector
- (To connect the RF signal to the Linear Amp)
- (F-connectors are the small ones used with cable TV)
- (UHF connectors are the large ones used for Ham Radio)
-
- If your VCR does not have RF outputs:
- An external RF modulator (converts video to channel 3,6,12 etc.)
- a cable with RCA connectors (a standard stereo cord is ok)
-
- A 6-meter Ham radio antenna.
-
- If you do not have a pre-made 6-meter antenna:
- About 20 feet of strong wire
- 3 ceramic antenna insulators
- another UHF connector
-
- Likely places to get the linear amplifier, connectors and cables is a
- Ham Radio swapmeet, a Ham club newsletter's classified ads, a Buy-Sell-Trade
- paper like The Recycler, or at a store specializing in Ham gear.
- RF modulators are available at specialty video stores, or major VCR dealers.
-
- Setting Up the Transmitter:
-
- Using a VCR with RF out:
-
- [VCR/RF]F----------------------------U[Linear Amp]U------------U[Antenna]
- weak RF Power RF
-
- Using an External RF Modulator:
-
- [VCR]R-------R[RF Modulator]---------U[Linear Amp]U------------U[Antenna]
- video weak RF Power RF
-
- Diagram Symbols:
-
- U UHF-connectors (Ham radio)
- F F-connectors (cable TV)
- R RCA connectors (stereos)
- --- coax, cables, wires
- [] devices (name of device in brackets)
- <I> ceramic insulator (the kind with a hole at each end)
-
-
- Building The Dipole Antenna:
-
- wire wire
- <I>---------------------+<I>+----------------------<I>
- | |
- Short coax | |
- [U] UHF connector
-
- The antenna is set up much like a clothesline with the wires tethered
- straight out horizontally. The outer insulators are used to isolate the
- antenna from the tether lines, which should be rope or nylon cords
- for good results. The inner insulator isolates a gap between the two
- long wires of the antenna.
-
- The length of the wires used for the antenna is critical.
- Look up the length in feet for the channel you want to use in the
- table below & make each of the two long wires that length.
- As a rule of thumb, a wire half-wave antenna's length in feet is equal to
- 468 divided by the frequency in MHz.
-
- ****************************************
- VHF Television Channel Data
- ----------------------------------------
- TV MHz ---carrier--- antenna
- channel range video sound lengths
- ------- ----- ----- ----- -------
- 2 54-60 55.25 59.75 8.47ft
- 3 60-66 61.25 65.75 7.64ft
- 4 66-72 67.25 71.75 6.95ft
- 5 76-82 77.25 81.75 6.05ft
- 6 82-88 83.25 87.75 5.62ft
- 7 174-180 175.25 179.75 2.67ft
- 8 180-186 181.25 185.75 2.58ft
- 9 186-192 187.25 191.75 2.49ft
- 10 192-198 193.25 197.75 2.42ft
- 11 198-204 199.25 193.75 2.34ft
- 12 204-210 205.25 209.75 2.28ft
- 13 210-216 211.25 215.75 2.21ft
- (All frequencies in MHz)
- (Lengths are for half-wave antennas)
- ****************************************
-
- For Further information: Look in the ARRL Handbook published by the American
- Radio Relay League for detailed plans & theory for antennas, transmitters &
- linear amplifiers. The info in that book can be used for setting up an
- underground AM or FM radio station.
-
- Uses for a TV Clandestine Station:
-
- Public Education: Make a videotape of each step in the process of constructing
- your transmitter. Show this tape in your broadcasts, "For informational purposes
- only", of course.
-
- Short-burst zipping: From a fixed or mobile base of operation show short
- snippets of graffiti-like computer graphics, quick subliminal messages,
- images & suggestions, or brief phreaker manifestos. Commercials are an
- opportune time to break into TV broadcasts.
-
- Live call-in shows: Using a Cheese Box, or other device for receiving
- untraceable phone calls and a video camera do a live call-in show. Encourage
- people to call in using Red, Blue, and other phreaking boxes.
-
- Cable TV Piracy: With modifications it may be possible to feed the power RF
- signal directly into a cable TV system, overriding cablecasts or comandeering
- unused channels.
-
- Mobile Operation: Using storage batteries and a 110-volt inverter the
- transmitter may be modified for mobile use to avoid detection by the FCC during
- long broadcasts. Battery operated mobile linear amps and portable camcorders are
- also available.
-
- * Please add any anecdotes or new information you discover to this file *
-
- Downloaded From P-80 Systems 304-744-2253
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