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VK3ZWI > AMRVIC 18.06.05 09:28l 45 Lines 1884 Bytes #999 (0) @ WW
BID : 49228_VK3DSE
Read: GUEST
Subj: Mystery QRM signals
Path: DB0FHN<DB0FOR<DB0SIF<DB0EA<DB0RES<ON0AR<ZL2BAU<VK3AYM<VK3DSE
Sent: 050618/0507Z @:VK3DSE.#MEL.VIC.AUS.OC #:49228 [Narre Warren] FBB7.00i
From: VK3ZWI@VK3DSE.#MEL.VIC.AUS.OC
To : AMRVIC@WW
Mystery QRM signals
-------------------
In Australia two very strong pulse signals are appearing on HF amateur
bands and the hunt is on to determine the source of these intruders.
A radar like pulse which peaks at 10dB over signal strength 9, and reported
to be up 100kHz wide is being heard regularly 7020-7080 kHz in the (VK)
mornings and 3590-3800 kHz in the (VK) evenings.
Reports from VK and ZL point to it being north-west of Australia. JA's and
W's during QSOs with VK also say they can detect the signal but at a lower
strength.
It's an unwelcome reminder of the havoc caused by the over-the-horizon
radar dubbed the Russian Woodpecker that fired up in 1976 and lasted a
decade. Hopefully this latest pulse signal is not another OTHR.
A repetitive cyclic sounding pulse signal is also being experienced in VK
on most amateur HF bands and often simultaneously on more than one band.
An inquiry by the Wireless Institute of Australia (WIA) has received
assurances that neither the (JORN) Jindalee over-the-horizon Defence radar
in central Australia or a new SECAR system in the Torres Strait north of
Queensland are to blame.
The (SECAR) Surface wave Extended Coastal Area Radar has begun trials. It
will enhance the monitoring ability for Defence and Customs to detect
illegal fishing and immigration. It could also be developed to provide
early storm warnings.
With JORN and SECAR being given alibis, the WIA's Intruder Watch
intruders@wia.org.au is now seeking reports from radio amateurs on the
harmful interference.
In particular it needs directional information and reported incidents of
these intruders disrupting QSOs and causing harmful interference. The WIA
will then take the matter up with the Australian Communications Authority
for its investigation.
Amateur Radio Victoria
amateurradio.com.au
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