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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 Outlaw Telecommandos 3 3
3 @DDDDDDDDDDDDDDDDDDDDDDY 3
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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.