X604 Half Wave Mast Mounted Omni-Directional Dipole Antenna. 0dB Gain

X604 Half Wave Mast Mounted Omni-Directional Dipole Antenna. 0dB Gain

Antennas of this type have unity gain and have a 360 degree radiation pattern.

Product Details

Features:

The X604 Antennas have a 360 degrees radiation pattern. They have mounting shackles to attach to a mast and are independent of ground plain.

Description:

Antenna Mounting

Antenna should be mounted as high as possible in a clear area as far away from obstructions such as metal clad buildings and foliage.

Feeder Cable

When designing a radio system the manufacturers data on 50 ohm coaxial cable must be referred to. The antenna feeder cable should be kept as short as possible. As a general rule, with 50 ohm low loss coaxial cable, half the power (3dB) will be lost every 10 - 20 metres.

RG316 has an attenuation of 6.89dB every 10m at 500MHz
RG58 has an attenuation of 3.7dB every 10m at 500MHz
UR76 has an attenuation of 3.6dB every 10m at 500MHz
RG213 has an attenuation of 1.7dB every 10m at 500MHz
RG67 has an attenuation of 1.5dB every 10m at 500MHz
LDF2-50 10mm Foam Helix has an attenuation of 0.8dB every 10m at 500MHz


Antenna Connectors

50 ohm coaxial connectors of good quality should be used. Termination must be in accordance with the manufacturers specification. Connectors exposed to the environment should be sealed to prevent the ingress of moisture. If the cable is penetrated by moisture an impedance mismatch will occur dramatically reducing the signal propagation. The cable will then have to be replaced.

Antenna Measured VSWR

The Voltage Standing Wave Ratio (VSWR) is the ratio of detected volts from the forward RF power, to the detected volts from the reflected RF power. In perfect antennas system all the RF power will be radiated by the antenna giving a VSWR of 1:1. If most of the RF power is reflected back into the transmitter then the VSWR will be 2:1. A good antenna system will have a VSWR of between 1.2:1 and 1.5:1.

Antenna Lightning Arrestors

At exposed antenna installations a lightning arrestor should be installed. This is connected in line with the antenna feeder. The case of the arrestor is connected to a solid earth. Should lightning occur, most of the energy will be diverted to ground thereby protecting the radio equipment.

Ref Description Downloads Price Quantity  
X604
£58.00
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