Yagi five unit FM antenna production–How to DIY a FM Yagi antenna


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Yagi five unit FM antenna production 

 

Antenna is receiver signal acquisition tools, used for remote FM radio receiving antenna most of them adopt YAGI (YAGI) antenna, YAGI antenna unit number joint affects the receiving range, unit number is more, direction more sharp, gain, the higher the straight distance more far.

China’s FM radio frequency band is 87.5-108 MHZ, and television channel 5 center frequency for 88 MHZ, so channel 5 antenna basic suitable for remote FM radio reception. Fans can purchase channel 5 TV antenna substitute, demanding fans will be channel 5 television antenna used after a change. I suggest using five unit of good, it has high gain, and volume is not big. Common channel 5 five unit yagi antenna is only 50 yuan ($10), after the most economical for change.

 

processing methods:

1. The antenna matching problem: general antenna output for 300 ohms, and cable for 75 ohms. Impedance matching different will receive, or high frequency signal is difficult to transmission.

Amu more for transformer type and U half wave ring. Transformer type verifier production is relatively complicated. Line and beads selection directly influence the matching coefficient. And U half wave ring just a period of 75 ohms cable is ok. I applied to think U half wave ring better.

2. Antenna debugging problems: installed antenna and not have the effect of irremediable, need to have the effect only after debugging.

The first step is to make sure to receive radio direction (for antenna for directional antenna), will antenna primers direction alignment radio direction.

Use receiver try the radio, and then the corresponding direction for one of the most weak signal conditioning antenna height, find a signal the strongest position after antenna settle.

3. Usage antenna amplifier problems should be paid attention to:

Currently on the market antenna amplifier for two 9018 combination, because 9018 work noise is bigger, it’s best to use 9018 C3358 or C3355 low noise pipe.

If use amplifier in multiple frequency point unknown to appear on a digital sound (audio pulse) interference other radio signal. This is the pager launch pad caused by harmonic regeneration. Is due to the antenna amplifier filter problem. Best in the input add a BPF (88-108 MHZ filter). From the old FM radio can be achieved. Also in the first level amplifier coupling capacitance before to add a 5-45 p capacitance.

4 antenna and cable joint should pay attention to rust.

Antenna general mounted on a roof, sun and wind after antenna interface is easy to rust. This will affect the transmission of signals and antenna matching. Make reception variation. If there is a antenna amplifier antenna could easily amplifier self-excitation. Best in the antenna installation will interface with anticorrosive paint.

5. Cable installation as far as possible when the string don’t roll together. Introduced in which the best just inside the house, in a socket, thunder can soon pulled out.

6. Antenna erection should pay attention to the lightning protection. High-rise buildings have commonly lightning rod, lightning protection range is to pinpoint the origin and needle into the Angle of 45 umbrella space. Antenna should be in this space inside to safety.

7. The antenna maintenance: due to the antenna wind to blow, insolation and after the rain will soon be oxidation. Have the time can be a year will antenna wash once, I am a year in a pair of antenna. All of the cable as interface with 95% alcohol cleaning.

8. The antenna reflector, oscillator and director can’t and support conduction, want to use plastic off!

9. Most radio head is 300 European input, can be in the radio 300-75 ohm the verifier break into 75 ohm interface.

 

A frequency modulation receiving system and not a good antenna and advanced cable will have very good reception. But in the antenna, cable and receiver and cooperate with each other to the can. Just as our sound, source, power amplifier, wire and speakers mutual collocation good just have good effect.

We choose to receiver that should be paid attention to, currently on the market a lot of radio are not suitable for carrying out remote FM reception. Ordinary micro radio mainly design in order to receive the local and adjacent station. It in the tuning process spends less time, so adjacent frequency processes is not good.

Ordinary radio head I think manual setting to score adjustment of good, at present number of ordinary adjustable radio head main design the function in it, not for its high sensitivity. Hand to the radio is China’s industrial mature products. Apparently common manual setting radio head score adjustment of good.

But in my use found the car FM receiver is quite good. Whether manual setting or number of adjustment. Its sensitivity and adjacent frequency treatment is very good. The signal intensity in 0.2 MHZ completely separable. Main it is used the integration tuner. A tuner unlike normal tuning, as well as putting and stereo demodulation design in the same block board. But by the production of professional manufacturers in addition. It no matter technology or technology is better.

Use WALKMEN, I think hand adjustable score adjustment of good, such as panasonic, love China, SONY’s radio functions are very excellent.

 

 

About Us

FMUSER is a high tech cooperation dedicated in providing solution project designing, technology exploring, manufacturing and marketing of fm transmitters. FMUSER has been in cooperation with plenty of countries overseas manufacturing fm transmitters as per customers’ needs, the business map reached to countries and regions like United States, United Kingdom, Japan and lots of countries from European and Southeast Asia. FMUSER is currently one of the biggest manufacturer of fm transmitters in china.

Our customer from all over the world

 

From April 12,2012 to April 15,2012, our company took part in Global Sources-China Sourcing Fair in Hongkong. Our booth number is 5H10
There are many people from all over the world, such as USA, UK, Australia, India, Philippine, visite our booth, and talk about some business. 

 

 

      welcome to visit our company   


Sample/Wholesale
Price
Shipping
Carrier
Buy it Now
1 pcs sample
USD
/pcs
USD
Airmail 25days

pcs
USD
/pcs
USD
Airmail 25days


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