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VK7 BPL Noise Floor report released
On the morning of 17 February 2007 a lightning strike caused the loss
of power in the Mt Nelson area.
With power and BPL systems non-operational, background noise level measurements
where taken around the QTH of VK7HCK and VK7HK.
Measurements were taken on 20m using Owen VK1OD's Field Strength Measurement
Software.
Comparisons between the previous noise floor measurements taken in January,
March and July 2006 and measurements taken with no power and no BPL, show
a noise floor that is between 10.9dB (12 times lower) and 12.6dB (18 times)
lower than the previous noise floor measurements taken outside the BPL
Trail area.
The most likely explanation for the lower measured noise floor level is
the lack of power in the previously BPL enabled area. This would mean
that all mains power devices including BPL equipment would have ceased
to operate and therefore ceased to emit any contributory radio frequency
noise.
The key conclusion from this report is that the initial impact of BPL
emission levels are understated.
The report is available on the VK7 BPL
Watch Page
http://reast.asn.au/vk7bplwatch.php#NoiseFloor
Justin VK7TW
Source: Wireless
Institute of Australia
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