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, also has high-bandwidth microwave links to Telstra Radio Terminal to the NE)

• The ionosondes are:

1. Jindalee Project WA Transmit Site, LAVERTON (LAV)
2. Defence Site, Ajana R/T, AJANA (AJA)
3. Defence Installation, CARNARVON (CAR)
4. Ionosonde Site, Learmonth Solar Observatory, Minilya-Exmouth Road, LEARMONTH (LEA) 11.3 MHz, 30K0WXN (modulated by amplitude, angle, pulse), Ionospheric Prediction Service
5. Defence Installation South Hedland, PORT HEDLAND (SHD)
6. Curtin RAAF via, DERBY (CUR)
7. Telstra Radio Terminal, KALKARINGI (KAL)
8. Defence Installation, GROOTE EYLANDT (GRO)
9. Scherger RAAF Installation, WEIPA (SCH)
10. Defence, Lynd River Site, LYND RIVER (LYN)
11. Queensland Jindalee Tx Site, via, LONGREACH (LON)
12. Corner of Operations Road & Land Ave DSTO, SALISBURY (Coordination centre) (a few other DoD HF sites in the vicinity)

• Common ionosonde frequencies (MHz): 10.5, 11.3, 21.5

[{%22site_desc%22%3A%22Ionospheric%22}%2C{%22client_name%22%3A%22Ionospheric%22}&q=Ionospheric Overview of sites with assignments belonging to Ionospheric Prediction Service]

• DSTO ionosondes:

1. Wyndham, WA (no HF matches)
2. Defence Site, DERBY
3. 11 Mile IPS Site, BERRIMAH
4. Elliott near Newcastle Waters, NT (no HF matches)
5. Joint Space Defence Research Facility, ALICE SPRINGS (otherwise known as Pine Gap)

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