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Frequenty Asked Questions
  • What does VSWR stand for?
    Voltage Standing Wave Ratio.
  • What is return loss
    Another name for VSWR.
  • 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.
  • 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 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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Vehicle Installation

Installing radio and satellite equipment into vehicles of any type requires knowledge, training, skill and experience; many companies and individuals claim to have all of these but are often being less than truthful.

Within the UK and Europe the required standard is well documented and relatively easy to achieve, but many companies have still not signed up to these common sense and well regulated processes.

G6 Global is a member of the Federation of Communication Services (FCS) and all mobile installations are carried out to the FC1362:2010 UK Code of Practice for the installation of mobile radio and related ancillary equipment in land based vehicles.

To protect your investment, and to maximise the performance of your communications system, good installation is essential.

Click on the ‘more details ’ tab above for more information on how G6 can help you with this activity.

Specific skills and knowledge are required when carrying out covert installation of equipment into vehicles. This is a very specialist area and a poor installation will not only hinder the ability to communicate, but could also compromise an entire operation. This is also the case for installations into vehicles that may be operating in hostile environments. Always consider implementing supplemental power systems with a split-charging capability. Ask your installer to explain this to you; if they greet you with a blank look then walk away and call us!

When it comes to installations in 2nd and 3rdworld 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.

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
  • Supplemental power systems
  • 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
  • Non-interference with vehicle systems

This process is internally and externally verified as part of our ISO9001 process.

Before you engage a company or individual to carry out any vehicle installation work for you, ask them some of the FAQ's listed here on the right hand side. These are fundamental technical questions and if they can't answer all of these to your satisfaction, we would recommend you look elsewhere.

Finally ask to have a look at their toolkit. This speaks volumes.  They should be able to show you:

  • Distinct crimping tools for the termination of different types of plug to different types of coax; these should be in good repair
  • A power and/or VSWR meter
  • A multimeter capable of reading volts, amps and measuring resistance and continuity
  • Clean, sharp, well maintained tools
  • Variety of consumable items i.e. ty-wraps, tape, heatshrink


Ten Questions to ask your installer