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Quarter-wavelength GP Antennal
2008年02月19日 FM Transmitter Shop ⁄ 共 1392字 暂无评论 ⁄ 被围观 252 views+
FM Radio Transmitter GP Antenna -- Quarter-wavelength GP antennal
 
FM Radio Transmitter GP Antenna FM Radio Transmitter GP Antenna FM Radio Transmitter GP Antenna
 
Specification:This is a wonderful FM Transmitter Antennae,the length of antennae can be adjust according to the Frequency you set!Frequency range: 85MHz ~ 150 MHzQuarter-wavelength GP antenna introduceIn the Radio Amateurs, Quarter-wavelength antenna can be seen as a simple but effective antenna. So in radio circles It accounts for a considerable proportion,For instance, Most of the police antenna is a quarter-wavelength antenna and so on. So Quarter-wavelength antenna has it’s reason to exist Absolutely.. If you do not know the high-frequency electronic, You may ask what is a quarter wavelength. In a word,It is Antenna Length Unit,it is based on frequency, here is the formula :

Antenna length (Wavelength)=( 30000 /frequency)*1/4 * 0.96(Wavelength Shortening rate) cm---- attention:Antenna Length Unit is cm

For exampl.If you want to make a antenna for 100.00MHZ
Antenna length=(30000 / 100.00MHZ) * 0.25 * 0.96 = 72cm

so we get the length of the antenna is 72cm then we prepare five 72 cm of Drawbars antenna and a M type Joints(figure), then link one of the Drawbars antenna to the main Spindle of the M type Joints, at last link the other four to the corner of the M type Joints(figure)

FM Radio Transmitter GP Antenna

Price: US $50.00

Shippment:

We combine postage on multiple purchases. Please check our other items! We ship only by TNT or DHL Express in order to improve the efficiency!

Flat international shipment via air mail 8-10 business days 30$

DHL/TNT transfer 4-6 business days 45$

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