Dipole Antennas

Best Dipole Antennas Ideas

Best Dipole Antennas Ideas

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Here's Dipole Antennas Selections:

Falcon 2400 Watt 11 Meter Dipole Cb Radio Base Sta...

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FM Dipole Antenna...

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ARRL's Wire Antenna Classics...

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Petra 880-1100 Fm Dipole Antenna...

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$128.99

 

Edimax EW-7128Gn 150Mbps Wireless 11n PCI adapter ...

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$19.99

 



korek api
 
Today's Discussion

Can dipole antennas be used to transmit as well as receive?
..and can you just send an signal through a coax cable and then on through the antenna? Thanks!

Reply
goober
Yes. All antennas work the same whether transmitting or receiving.

Roger
Goober is right. A receiving antenna does not have matched to the receiver for the receiver to receive a signal. However it is important that the transmitter's antenna be properly matched to the transmitter to prevent the transmitter from being damaged or shutting down to a high Voltage Standing Wave on the transmission line ( coax cable).

Banjo59
Absolutely.

Technobuff
Sure! Note that DI means 2, and a dipole is a 1/2 wavelength antenna, centre fed. A reasonable termination for the coax from the transmitter is to roll a number of turns just before the antenna to form a choke. Then, one half of the antenna connects to the braid of the coax, and the other to the centre conductor. The purpose of the choke is to prevent RF radiation from the coax outer shielding. There should be some sort of insulating mounting at the centre, to support the coax and the 2 halves of the antenna. There should also be "egg" insulators at both ends. The dipole length depends on the frequency of transmission, so the overall length of the antenna will be 1/2(300/frequency in mHz) metres, and the approximate shortening factor if using insulated wire as the antenna, is to use 95% of the calculated length. Such a dipole can be expected to have a VSWR around 1.5:1, as the centre impedance is about 75 ohms, while the coax from the transmitter is 50 ohms. 1.5:1 is only a small mismatch, which should not materially affect power out of the transceiver.




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