Search Results
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. [...]
Rf 15W - 30W power amplifier KT922, KT930, KT934
This amplifier ensure the power you need for a small transmitter.
Depending of input power, power supply and transistor, this amplifier can boost from 15W up to 30W.
The most important components : 7805, 1N4001 diodes mounted in series, 120 ohm / 2W resistor and 1N4145 diodes.
The setup : trim P (220 ohm ) untill you obtain [...]
