Antena Pemancar Radio FM

The antenna serves to radiate signals and radio wave radiation. Antenna generally divided into two by the beam, ie

Omnidirectional (all directions). This antenna radiates radio waves strong kesegala same direction.

bidirectional (both directions). This antenna radiates radio waves as strong to just two directions. The two parameters that need to be considered on an antenna is the polarization and penguatannya. Simply put, an antenna has a vertical polarization if the antenna is placed in a position perpendicular to the earth. Antenna with vertical polarization will produce radio waves with vertical polarization, too. In addition to vertical, there are also berpolarisasi horizontal antenna, the antenna plays when the field parallel to the earth.

Gambar antena FM Omnidirectional

One important factor in the FM antenna system installation is the antenna height. In the VHF band, provided that communication can take place is a LOS (Line Of Sight). So ideally communications on VHF, the antenna receiver and transmitter both have seen each other. So in between there must be no objects that can absorb radio energy.

So that radio amateurs in the VHF band is often stated that a better antenna has a small gain but higher than the antenna mounted with a large gain but low installed.

READMORE...

Rangkaian Penala Antena

This is a series of antenna-tuning circuit or circuits for transmitting antenna placement SW 3-30 MHz wave / short wave 3-30 Mhz. If the placement is just right then the maximum energy from the transmitter will send out all the antenna through sehinnga nothing is wasted. To get a clear picture of the circuit is click on the picture below.

Skema Rangkaian Penala Antena

This transmacth circuit function is to locate an appropriate impedance between the transmitting antenna that occurred in the ratio 1:1 SWR reading it, because in this placement is associated with a series of SWR / standing wave ratio. Thus the purpose of 1:1 is the one that came out was also one emitted by the antenna instead of just half saja.Impedansinya generally is 50 Ohm. With this circuit the maximum power that can pass this circuit is 50 Watt.


About SWR meter

The SWR meter or VSWR (voltage standing wave ratio) meter measures the standing wave ratio in a transmission line. This is an item of radio equipment used to check the quality of the match between the antenna and the transmission line.

SWR Meter Installation

SWR Meter Pic

The VSWR meter should be connected in the line as close as possible to the antenna. This is because all practical transmission lines have a certain amount of loss, causing the reflected power to be attenuated as it travels back along the cable, and producing an artificially low VSWR reading on the meter.

READMORE...