Coverage

Coverage planning and prediction are integral parts of any broadcast system design as they ensure optimised use of available resources including spectrum, power and equipment.

To this end, JDA operates a purpose built computer database that stores and relates both land profiles and NZ Census information. This system enables us to predict, analyse and graphically display models of radio or television signal coverage from any point at any elevation throughout New Zealand. The 3D output includes coverage maps and path analyses.

These results can also be instantly related to demographic data from the NZ Census database, enabling clients to see their potential signal coverage and analyse it by demographic breakdown on all major Census parameters.

 

Coverage Audit

DA maintains an extensive range of specialised test equipment and a field survey vehicle in order to undertake necessary field measurements and coverage audits. JDA's services in this area can determine whether or not a system meets licensed specifications and is operating as designed. We can also undertake interference audits to determine the origin of interfering signals or to find out whether or not a client's transmissions are interfering with another broadcaster.

Some examples of coverage surveys and audits JDA has completed are:

  • Sky Tower's FM transmission system
  • Most of TV3 and C4's network
  • Ruru's FM transmission system

 

Find a site

JDA has extensive experience in locating potential transmission sites for all types of broadcasting including, amongst others, television, FM radio, land mobile, and all types of data linking. We have developed techniques including intervisibility studies and coverage plot predictions for rapidly determining the best possible locations to suit client's needs. We have experience with land owner title searches, resource consent applications and contract negotiation.

Often, it is sensible to co-site with other broadcasters at one of the many established sites throughout New Zealand as infrastructure costs and overheads can be reduced. JDA can suggest suitable co-site locations and can provide advice regarding rental costs, and contractual arrangements.

 

Intervisibility

An important tool in site scoping studies is an intervisibility analysis. This allows JDA to show clients what they can expect to see from a given point anywhere in New Zealand.

Although this technique requires refinement to predict coverage of radio waves, it is a relatively fast and efficient way to get a feel for potential transmitter locations, as various transmit and receive antenna heights can be entered to quickly establish the most suitable height of a transmitter or receiver. These features are especially useful during initial planning stages if many of the finer details have not been determined.

 

Population Analysis

For all broadcasting systems, it is important to determine which geographical areas contain the intended audience and which do not, so sufficient signal can be provided where required yet minimised elsewhere, enabling the design of an efficient system. This task is easily performed by JDA's purpose built computer database.

Populations can be analysed in terms of received field strength to determine what grade of service they receive. We can also produce demographics for all census categories including age, ethnicity and salary