How to make FM Yagi Antenna

Receiver antenna is a tool to capture signals, FM radio reception for remote antenna is mostly Yagi (YAGI) antenna, Yagi antenna, the number of cells directly affect the reception range, unit number, the more, the direction of the more acute the higher the gain , the greater the distance straight.
       China's FM broadcast band is 87.5-108MHz, while the TV Channel 5's center frequency is 88MHZ, so the five basic channels for remote antenna, FM radio reception. Enthusiasts can purchase five channel TV antenna alternative, demanding enthusiasts can be five channel TV antenna with little change after I suggested five elements of good, it has a high gain, and the volume is not for ordinary five-channel Yagi antenna 5 unit only ten yuan, most cost-effective changes after purchase.

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八木五单元FM天线的制作FM Yagi Antenna

The following are some treatment methods using the antenna:
  
1 antenna matching problem, the general output of the antenna is 300 Euro, while the cable is 75 more than in Europe, have different impedance matching, otherwise it is difficult to transmit high-frequency signal. Multiple-antenna matching transformer and for the U-shaped semi- wave ring, transformer type matcher to produce more complex, and the magnetic lines directly affects the selection of matching coefficient, while the U-ring only a half-wave 75 ohm cable on it and I applied, I feel half-wave U-shaped ring style better.
  
2 antennas debugging problems after installing the antenna, there is not an immediate effect, there can not be debugged before the effect by definition, first to determine the direction you want to receive the radio (because the antenna is directional antenna), Introduction of the antenna directed towards the radio direction received by the radio receiver test, and then find the corresponding direction of the weakest signal conditioning, a height of the antenna, the strongest position to find a signal after the antenna horde.
  
3 using the antenna amplifier should be noted that, at present the antenna amplifier on the market more than 9018 combinations of the two, because 9018 noisy work, to "fever" is best to use C3358 or C3355 9018 low noise tube. If When using the amplifier appeared in a number of frequency points unknown digital sound (audio pulse) interference with other radio signals, paging transmitters which is caused by the harmonic regeneration is due to the antenna amplifier filter, the best in the input plus a BPF (88-108MHZ filters), FM radio from the demolition of the old (shape, such as television 6.5MHZ filter). also in the first stage amplifier before coupling capacitor to increase the capacitance of a 5-45P.

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4 Antenna and cable connectors should be noted that anti-rust, the antenna is generally mounted on the roof, the sun and the wind after the antenna interface is very easy to rust, it will affect the signal transmission and antenna matching, so that reception worse. If the antenna amplifier antenna amplifier self-excitation can easily make the best will in the antenna interfaces painted rust.
  
5 cable installation Do not try to straighten volume with the introduction of house just behind the house at the best safety in the sockets, thunder can quickly remove it.
  
6 antenna set should pay attention to lightning, high-rise buildings generally have a lightning rod, lightning protection range is the origin and the needle tip into a 45 degree angle the umbrella space, the antenna should be in this space that was safe.

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7 maintenance of the antenna, the antenna by wind, sun, rain soon after being oxidized, the antenna have time to wash once a year, I was a year for a pair of antennas. Like all interfaces to the cable with 95% alcohol wash.
  
8 reflector antenna, oscillator and director can not stand turn, use the plastic separated!
  
9 Most radio head is a 300 ohm input, the radio in advance of the 300-75 can be matched in Europe is disconnected into 75 European interface.
        
Not have a good FM antenna reception system, advanced cable has a good reception. But to the antenna, cable and receiver only possible in cooperation with each other. Fever as we sound the same, audio, amplifier, wire , with each speaker as well have a good effect, we select the receiver should be aware that many on the market today are not suitable for long-range FM radio receiver, the ordinary micro-radio is mainly designed to receive local and adjacent to the radio, it In the tuning process to spend less time on, adjacent handled properly, it is mainly spent on the overall design. ordinary radio first hand tone than I think a good number of transfer, the current number of ordinary domestic radio head major tune design in its function, rather than seeking its high sensitivity, hand-tune the radio is a mature product of our national industry, it is clear than an ordinary hand-tune the number of radio head a good tune, but some made several transfer machines is good, has been and some imported products can be a Bimei in my car using the FM receiver is found very good, or whether it is hand-tune the number of tone, its handling is very good sensitivity and adjacent channel, the intensity of the signal 0.2MHZ fully separation, it is a major integrated tuners, one tuner is not the same as an ordinary tuning and stereo demodulation with the release on the same board design, but also by professional factory production, process or technology, whether it is better using WALKMEN, I think the ratio of the number of hand-tune a good tune, such as Panasonic, Aiwa, Sony's radio functions are very good.

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