antenna

1570

Circuit Mini FM transmitter – video assembly instructions

Instructions, how to build a mini station from cheapest simplest components. Either frequency, modulation, FM (frequency modulation), sends the component values ​​at around 100 MHz Mini Transmitter Instruction Building a super spy bug transmitter.

The 20k resistors together with the resistance of the condenser microphone sets a voltage divider composed of the (dc) operating point of the transistor. Since the resistance of the microphone capsule to the beat changes of the sound waves, does this change and the operating point of the transistor, or in other words, the transistor amplifies the low-frequency voltage to the (electret) microphone comes in a common emitter circuit, the low-frequency signal is at the base and is amplified by the transistor.

Simultaneously, the transistor amplifies the RF signal but also in basic circuit. A small portion of the vibration of the oscillator circuit from the collector (amplifier output) on the 5.6 pF capacitor to the emitter (high-frequency amplifier input of the base) is fed back, the drive current Fliest from the emitter to the base and then 3.3 on the nF capacitor to ground. The capacitor on the basis of mass must be small enough that it does not hinder the low-frequency audio signal, but also large enough that the high-frequency, virtually unhindered tiles to ground. The 470 ohm resistor at the emitter stabilizes the operating point and sets the input resistance of the base circuit.

The whole thing is rather something like an emitter circuit audio amplifier circuit combined with a basic high-frequency amplifier with only one transistor.

1483

Video tutorial How to make a high gain wireless antenna – Cantenna

Cantenna
From Wikipedia, the free encyclopedia
A “cantenna” is also a brand name for a dummy load.

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A cantenna.
A cantenna is a directional waveguide antenna for long-range Wi-Fi used to increase the range of (or discover) a wireless network.
Contents [hide]
1 Origin of the name
2 Construction
3 Usage
4 See also
5 External links
6 References
[edit]Origin of the name

Cantenna dummy load suitable up to 30 MHz and up to 1 kW
The term ‘Cantenna’ originally referred to a product sold by Heathkit Co. in Benton Harbor, MI, USA. It was a 50-ohm resistive load used by radio amateurs.[1] However, in the more casual vernacular of the Do-It-Yourself community, it has functionally become a portmanteau of can (e.g. an empty Pringles can, see below) and antenna, since they’re used to broadcast (and receive) signals, and not just terminate them.
[edit]Construction

Although some designs are based on a Pringles potato chip can, in reality this tube is too narrow to be practical.[2], however a cantenna can be made from various cans or tubes of an appropriate diameter.[3] Some designs include a pole mount to elevate the cantenna.[4]
[edit]Usage

While cantennas are useful for extending a wireless local area network (WLAN), the tiny design makes them ideal for mobile applications such as wardriving. The design of the cantenna is so simple that it is often the first antenna WiFi experimenters learn to build. Cantennas can even be used to increase cell phone range,[5] improve reception and decrease noise.
[edit]See also

FON#La_Fontenna, an omnidirectional, cheap and high power antenna to distribute internet access around the world using a series of wireless LAN’s
WokFi antenna

1442

Video DishPointer Pro + Android = satellite dish allignment

The way of finding the satellite when installing a satellite dish, using Samsung Galaxy S and DishPointer Pro application. The next generation satellite finder on Android phone. Point your cellphone anywhere towards the sky and all the satellite will appear on the screen.

1379

How to build the best homemade hdtv antenna – video tutorial

This is how to build a homemade TV antenna so that you can catch FREE HDTV. All you need is some copper wire, screws, washers, a piece of wood and a balum.
How to build the best hdtv antenna - video tutorial

Material list for HDTV homemade Diy Antenna

  •  10 Feet of Copper Wire
  • 6 Washers
  • 6 Wood screws
  •  2-3 foot piece of Wood
  • 1 Balum or Transformer
  • Something that can cut the Wire
  • Drill / Screwdriver
  • Tape Measure
  • Sharpie

Schematics for HDTV homemade Diy Antenna

1375

How to Make a Homemade Analog TV Antenna -video tutorial

How to Make a Homemade Analog TV Antenna
In this tutorial,  Teach You how to make a simple analog TV antenna.