The program is to be fed from the local studio to a transmitter by terrestrial means
Remote Local Radio - Pilbara
To provide continuous coverage for ABC Local Radio and a pair of local commercial stations to cover all areas excluding, the Kimberley, Goldfields/Esperance and the South West of WA.
Antennas and Transmitters
These transmitters and antennas will be similar to those at Newman.
The transmitter site should be near Norseman to centre the beam through WA and to ensure the Northern Goldfields gets an adequate coverage.
Continuity of Transmission
is not in an cyclone or earthquake zone.
should be fed (in compressed form) by two program circuits from Karratha;
A connection to the fibre-optic network to Esperance
Solar energy is in abundance (138 clear days and 90 cloudy days on average per year) and the peak electricity load is at dawn & dusk. The average wind speed is 12.1 km/h @ 09:00 and 13.6 km/h @ 15:00 solar time39. Its monthly average is even through the year. Unfortunately, these values do not represent the dawn, dusk & night figures at the site.
To ensure the most reliable reception at the lowest cost it is essential to have remote unattended receiving stations.
The reception quality information could be shared between the broadcaster and the Ionospheric Prediction Service to build an accurate model of the Australian Conditions.
The vertical angle of radiation can be adjusted and monitored using the receivers, live.
There are currently available in Australia software decoding receivers using a computer and a receiver board. This software can measure the signal strength and Bit Error Rate (Quality of decoding).
The receivers can be connected to the internet or the mobile phone network. This would mean that the reception quality could be obtained at any time along with remote control of the receiver.
Connected to the receiver would be an antenna and it could be solar powered if required.
Location of Receivers
They must be in an electrically quiet location
At radii or 256, 512, 1024 and 2048 km. For Kulgera, they should be north and south and east of the transmitter site. This is because the ionosphere in tropical zones behaves differently to that in sub tropical zones.
All distances and angles were calculated using GDA Vincenty Calculation Results (Inverse)40. These calculations operate in 3 dimensions, because the earth is a sphere.
All sunrise & sunset times were calculated using Geoscience Australia41
These calculations were used to calculate sun rise/set on the longest and shortest days of the year. These values vary with latitude and the offset is caused by a change in longitude.
DRM Website42 Please download the demonstrations and listen to them. The trial distances are on the next page.