11 meter 5 element yagi antenna calculator

Gamma matching is used for the falconry telemetry system as the single rod dipole has a narrow bandwidth which is exactly what is needed when tracking a very specific frequency. This antenna design calculates a single dipole rod as active element a gamma match would be the simplest way to connect it to 50 Ohm transceivers. A separate section deals with connecting the driven active antenna element to a 50 Ohm transceiver via coax. To connect this to 50 Ohm transceivers we need transformers to convert 73 and 300 Ohm to 50 Ohm.

: The impedance at the center of a dipole is about 73 Ohm, and that of an open folded dipole about 292 Ohm. Do not use aluminium tubing or other metal materials for the boom. Second to note about the boom is that it is assumed to be made of non conductive material, like PVC piping. It stands to reason that more length is needed to mount these elements to the boom and you might want an area behind the reflector to mount the antenna itself. * Boom length: BL The boom length should be more than is calculated as this distance is measured from the center of the reflector to the center of the last director. Construction materials for UHF/VHF are PVC plumbing pipes and joints and aluminium melding rods, although heavy gauge copper wire is also suitable.įrequency calculations are based on radio waves traveling at the speed of light Performs very well and can be used for RX and TX purposes. It is different from the other antenna types because of this 'one direction reception'. The more parasitic director elements (up to a point) added will increase the DB (gain) and narrow the receptive beam width. The Yagi antenna is a directional antenna using parasitic director and reflector elements to amplify the radio frequency signals from the direction it is pointing. The amount of antenna elements (the more elements the more (inverse log) gain it has and directional beam becomes more narrow.)īoom diameter BD in millimeters (the diameter of the PVC pipe where the antenna elements will be mounted on)Īntenna elements diameter ED in millimeters (the diameter of the antenna elements) The center frequency of the antenna in MHz

11 meter 5 element yagi antenna calculator