8
©Miri Technologies - www.miri.com.au - Telephone: (+61 8) 9409 8998, Fax: (+61 8) 9409 9229
30 Buckingham Drive. Wangara, WA 6065 Australia
5. Antennas
It is imperative for the reliable operation of your radio telemetry system that the antennas be installed correctly. It is
therefore strongly recommended that the services of qualified radio personnel be used for the antenna installations.
The following example is a guide only which shows the salient features relating to the installation of commonly used
antennas. These antennas are vertically polarised, which will normally be the case for point to multipoint systems
within Australia. In point to point links, the radio license will typically be for horizontally polarised antennas, in which
case the YAGI antenna shown would be rotated through 90 degrees.
Vertically Polarised 450 – 470 MHz Antennas
Typical Mounting Arrangements and Dimensions
Notes:
• All cable connections must be sealed with butyl self-amalgamating tape. PVC tape is not acceptable!
• Antennas should be mounted free from immediate obstructions to provide a clear line of sight in the required
direction.
• Standard antenna mounting brackets are designed for 55mm OD pipe.
• The coaxial cable should be stress free and not include any sharp bends.
• The drain hole in the driven element of the antenna must point downwards.
To Next Page
Loading...
Need help?
General
