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Wednesday, 29 September 1971
Page: 1716

Mr Barnard asked the Minister for Ship ping and Transport, upon notice:

What are the comparative costs of an Omega transmitting system using an aerial

(a)   mounted on a platform;

(b)   erected on a complex of high masts; and

(c)   slung across a valley.

Mr Nixon (GIPPSLAND, VICTORIA) (Minister for Shipping and Transport) - The answer to the honour able member's question is as follows:

Comparative costs can really be given only in relation to specific sites. It is not possible to make cost comparison merely in principle.

The cost of an installation depends to a significant degree on the earth system requirements, which in turn depend' very much on the terrain and the natural conductivity of the soil at the site.

As a broad guide, overseas information suggests that a tower-supported aerial and associated earth system tends to be cheaper than valley-span systems.

The reference to an aerial mounted on a platform is not understood.

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