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Frequenty Asked Questions
  • What does VSWR stand for?
    Voltage Standing Wave Ratio.  
  • What does VSWR measure?
    The ratio or maximum and minimum voltage in a transmission system (coax and antenna), and is expressed as a ratio typically 1:1.1.
  • What is return loss?
    Another name for VSWR.
  • If I have a radio with 50W output, and I lose 3dB through my transmission system, what is my radiated power?
    25W.  3db represents a loss of 50% of the transmitted power.
  • What is the impedance of a typical radio communications transmission system (coax and antenna)?
    50 ohms.  If the answer is 75 ohms they are probably more experienced with CCTV systems which uses 75 ohms.  However, the two are not interchangeable even though they look the same; i.e. a 75 ohm plug fitted to a 50 ohm cable will cause a huge loss in the efficiency of the system.
  • How do you test the RF (Radio Frequency) a system after installation?
    They should show you a power meter capable of measuring forward and reflected power and VSWR.  This is the minimum required to confirm a competent installation.
  • What is a duplexer and what is its function?
    A duplexer is a filter and provides isolation between two ports.  A typical use would be to allow a radio device such as a repeater, which transmits and receives simultaneously, to use a single antenna rather than two antennas (one for transmit and one for receive).  The duplexer provides the necessary levels of isolation between the transmit and receive radios.
  • What is the difference between an omni-directional antenna and a beam antenna?
    An omni-directional antenna transmits equally in all directions.  A beam antenna (sometimes referred to as a Yagi after its inventor) focuses the RF signal in a specific direction.
  • What is an ohm?
    An element of electrical resistance.
  • What is ohms law?
    The relationship between voltage, current and resistance in an electrical circuit.  V (Voltage) = I (Current) x R (Resistance).
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Fixed Site Installation

SERVICES – FIXED SITE INSTALLATION

Installation at fixed sites both in the UK and overseas is a G6 core capability.  Getting it right in the UK can be difficult enough, but carrying out a technically competent installation in a hostile environment, often under duress in extremes of climate and within very tight timelines, is beyond the capability of many organisations; despite the fact that they say they can, usually they can’t.

Within the UK and Europe the required standard is well documented and relatively easy to achieve.  Despite this there are many companies who offer communications installation services but, in reality, do not know the first thing about how to complete a technically robust installation.

When it comes to locations in 2nd and 3rd world countries, there are often no defined standards and ‘everyone’ is an expert.  It is not surprising then, that many companies elect to use local ‘experts’ simply on the basis of cost saving.  This is a mistake and a major miscalculation on their part.  Having often invested several tens of thousands of pounds into equipment, it is complete false economy not to have it installed, commissioned and tested by a reputable company whose bona fides can be verified.

Click on the ‘more details’ tab to learn how G6 can help you with this activity.

G6 Global is a member of the Federation of Communication Services (FCS) and all fixed site installations are carried out to the FC1311 Cods of Practice for Business Radio Site Engineering: 2013.

But we go further than that: in addition to the FCS Code of Practice, G6 has its own Communications Installation Manual, which covers in detail areas such as:

  • Frequency & Licence compliance
  • Equipment compliance markings
  • Location of equipment
  • Siting of antennas
  • Cable runs (Power/RF/Control)
  • Correct & safe use of hand tools
  • Installation techniques
  • Fleetmapping
  • Commissioning & Testing

 This process is internally and externally verified as part of our ISO9001 process.  A copy can be downloaded from the Knowledge Base of the G6 website http://g6-global.com/knowledgebase/installation_process

Before you engage a company or individual to carry out any fixed site installation work for you, ask them some of the questions in our FAQ at the top right of this page.  These are fundamental technical questions and if they can’t answer all of these to your satisfaction, we would recommend you look elsewhere.


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