The antenna tuning unit may be used with a selection of long wire antennas like outdoor antenna and short wire antennas like attic antenna.
#Antenna tuner simulator Patch#
Theses variations of antennas are known as patch antenna which is mounted on top of a ground plane having a square conductor as a horn antenna where it is utilized under high gain situations as random wire antenna which is typically any straight long wire connected to the radio a Yagi-Uda antenna which is directional in nature and utilizes parasitic elements a dipole antenna consisting of two wires having a different direction but similar point of contact with each other’s end and an isotropic antenna where radiation comes in equal directions.
These inductors can be made out of the parts of old radios.Īntennas can be made of different styles, each of which having its own advantage. The switch contacts are connected to each tapping points. İt also has 60 turns using a standard wire gauge of 32. İn the 60th turn tapping point is where the other coil L2 for medium wave will be connected which is wound around a 3 inch length ferrite rod having a diameter of 3/8 inch. The wire may be made of enamel covered copper wire with the tapping of the coil done on the 3,4,6,8,11,15,20,30,40,50 and 60 turns. Inductor L1 can be constructed by winding a standard wire gauge of 22 around an inch diameter with air space between turns. To be able to tune the circuit for medium wave frequency, an inductor L2 with a value of 200 uH is added. To select the tapping point, S1 is used while the capacitors give the highest adjustment on the signal received. In the circuit, two variable capacitors C1 and C2, and an inductor L1 with multi-tapped coil forms a PI filter. Tuning the antennainvolves positioning a suitable value of the capacitance and inductance depending on the exact length of the antenna. The resonance may be varied by altering the inductance or capacitance. The resonance that was produced due to this combination is excluded to the natural electrical resonance being produced by the active antenna. The reactance of the active antenna goes with the reactance produced by the capacitor or the inductor, which will then lead to the resonance of the circuit together with the active antenna.
When the circuit unit is combined with the active antenna, the tuning of antenna is done by modifying the capacitor or the inductor. In general, the ATU is performing two main tasks, tuning and matching. This is favorable to any radio listener as it increases the gain of the signal while matching the received frequency with the resonant length of the antenna.
This is made possible because of the resonant filter of the circuit that gives the receiver an increase on the signal meter. Although it does not provide gain, it offers an improved equivalence between the receiver and antenna. Medium Wave – operates within the frequency range of 515 kHz to 1629 kHz which is part of the medium frequency radio bandīeing a passive antenna, it does not require connection with any receiver or transmitter but can have a great effect in the directivity of an antenna system. The circuit is intended to produce a simple antenna that has the capability to be tuned at medium wave frequency which complements the antenna of a radio receiver, without having to use any external power.Īntenna– an device used to receive and transmit signals by means of electromagnetic waves which is converted to electrical currents and vice versa
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