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Mobile phone sniffer - gsm telephone detector
With this mobile phone sniffer will track down mobile phones. Use this handy directional finder in situations and locations where the use of a mobile phone is forbidden. This neat unit will not only detect the presence of mobile phone activity (voice or text), it can home in on the culprit!
Apart from mobile phones this [...]
Half wave Dipole antenna
Dipole antenna or half wave antenna are the most used because is easy to build and cost a few bucks but has some drawbacks like little directionality, small gain.
The dipole antenna is build generally like in the picture but it is symmetric and the coaxial cable is asymmetric, that’s why we use a piece of [...]
Yagi antenna 3 elementes
Yagi antenna can be used at transmission or reception but yagi antennas are more used for transmitters.
Yagi antenna or Yagi, is a directional antenna system consisting of an array of a dipole and a reflector and one or more directors.
The dipole in the array is driven, and another element, 5% longer, operates as a reflector. [...]
