JORN

General

• Jindalee Operational Radar Network
  • Emphasis on the Operational, as OTH-B is not an easy problem (a good summary).

On RFMap

The sites on the JORN Wikipedia entry can be found on RFMap.

• The four JORN transmitter and receiver sites are:

1. the Queensland transmitter at Longreach, Queensland, with 90 degree coverage (Queensland Jindalee Tx Site, via, LONGREACH)
2. the Queensland receiver at Stonehenge, Queensland, with 90 degree coverage (Queensland Jindalee RX Site, STONEHENGE)
3. the Western Australian transmitter at Leonora, Western Australia, with 180 degree coverage (Jindalee Project WA Transmit Site, LAVERTON)
4. the Western Australian receiver at Laverton, Western Australia, with 180 degree coverage (Jindalee Project WA Receive Site, LAVERTON)

• The research and development transmitter and receiver sites are:

1. the Alice Springs transmitter at Harts Range, Northern Territory, with 90 degree coverage (Telstra/Defence Site, HARTS RANGE)
2. the Alice Springs receiver at Mount Everard, Northern Territory, with 90 degree coverage (Defence Site, Off Tanami Road, MT EVERARD) (previous test site just SE of main site)

Clients

• DoD

• RLM Systems has been acquired by Lockheed Martin.
  • Have two assignments at most TX/RX sites in the ~480 MHz range (no link specified).

Assignments

Common emission designators:

• 100HN0N - Unmodulated sequence of pulses, no modulating signal, no information transmitted
• 100KFXN - Frequency modulation
• 30K0P0N
• 40K0P0N

4.59 MHz

• ~4.59 MHz has been found while listening on HF. As it happens it is a registered assignment for many of the JORN stations:

File:JORN 4.591MHz.jpg

The JORN transmission is the strong one. Note the weak 'sweeping' of the spectrum just to the left of it - part of JORN too?

• The matching assignment is 4.5905 MHz at 10 kW (3 kHz bandwidth)

Note that automatic site fetching has been disabled in the following links; if you wish to fetch other sites, please check the box in the top-right of the map.

1. Defence Transmitter Site, HUMPTY DOO
2. Defence Receiver Site, SHOAL BAY
3. RAAF Base, AMBERLEY
4. Defence Transmitter Site, LYNDOCH
5. Defence Site, North Ward, TOWNSVILLE (masts to the ESE)
6. Defence Transmitter Site, BOHLE RIVER
7. Defence Receiver Site, MORUNDA
8. Royal Australian Air Force, WILLIAMTOWN
9. Defence Receiver Site, SPEED CREEK
10. Defence Transmitter Site, NORTH WEST CAPE
11. Defence Receiver Site, NORTH WEST CAPE
12. Defence Site (RAAF), ROCKHAMPTON (site has wrong position)

De-modulation

Some simple signal analysis reveals interesting features:

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