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Choice and location of antenna can make all the difference in your installation.  XL Provide a range of standard antenna for most circumstances, however - should you need something out of the ordinary - please don’t hesitate to ask! Please remember to check the local regulations before installing any gain antenna.

Here is a brief summary of some of the antennas most commonly used for radio data modem installations, that we keep in stock. Further details of this equipment can be viewed by selecting from the first set of buttons or by clicking on the antenna name below. XL are always pleased to discuss your application and to offer advice on which antenna is the most suitable for your application.  Remember if you need range, you will need to sight the antenna as high as possible to get it into free space

Standard Quarter Wave

is suitable for direct connection to the radio modem for internal use and for the attachment to a waterproof housing for external use. 

1/2-wave omnidirectional

in built groundplane antenna Data Sheet (YA0103)

 Pole Mount

This antennas main feature is that it will radiate the signal in a downward direction as well. Can easily be mounted in an elevated position to maximize distance Data Sheet (KG 2006)

 Magnetic Mount

quarter wave antenna is suitable for temporary vehicle mount applications. The antenna is supplied with a 5m RF cable and fitted with a TNC connector  Data Sheet (KG MAG)

Quarter Wave Surface/Body mount

antenna is suitable for permanently mounting on a vehicle and is supplied with a 3m RF cable fitted with a TNC connector.Data Sheet (KG MAG)

Marine Quality  scaffold mount omnidirectional dipole

 is a unity gain real all weather dipole. Will stand marine and most other hostile environments and easily mounted on a scaffold pole to gain extra elevation and thereby improve distance. It is considered to be one of the best unity gain dipoles on the market and is suitable for most base station installations) Data Sheet (KG 2207/8)

3db gain antenna

 - potentially boosting the power of a 10W Epic to 20W ERP this must comply to OFCOM licence regulationsData Sheet (KG-2216)

6db gain antenna

potentially boosting the power of a 10W Epic to 40W ERP this must comply to OFCOM licence regulations Data Sheet (KG-2222

869MHz Base Station

This antenna has been recently added to the range to cater for the latest Satel released modem to be used in the European market place. 869MHz 6dbd gain collinear base station antenna (KG 2223) There is also a 869MHz 5dbi gain base station antenna (KG 2226)  As these ae GAIN antenna it is the responsibility of the installer to check that they comply with local regulations

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Antenna Cables 

In order to place your antenna in the prime location i.e as high as possible and in free space, XL can provide low loss cable with suitable connectors to your specification.

This is a useful too to calculate loss incurred from long cable runs http://www.timesmicrowave.com/cgi-bin/calculate.pl

 

Simple explanation of DBD V DBI

If you can imagine looking at an antenna from the side and ‘seeing’ the RF field that is generated it would look like the patterns shown below.

You can see the (Gain) difference in dBi verses dBd. Also you can see the pattern shape when using a Yagi and the gain in one direction.

dbd dbi

 

Antenna Length Calculation

300 divided by the transmit frequency in Megahertz will give you the wave length at the transmit frequency.

 

Divide the wave length by four and you will arrive at a quarter wave antenna.

 

Get out your digital calculator!

 

Therefore:-

 

300/458.5MHz = 0.654 Metres or 654mm /4 = 0.163 Metres or 163mm

 

Thus a wave whip at 458.5MHz is 163mm

Remember to measure the ACTUAL antenna minus any base it may have.

 

 

get_acrobat
25 January 2013