06/17/2016
A "Scanning RF Seismograph[1]," a real-time HF propagation-monitoring tool
developed by the MDSR Team[2] and Alex Schwarz, VE7DXW, of the North Shore
Amateur Radio Club (NSARC[3]), has been established in Western Canada. The site
is in Lynn Valley (CN89li), North Vancouver, British Columbia, at 500 feet ASL.
A Yaesu FT-950 transceiver connected to an omnidirectional multiband antenna
monitors JT-65 frequencies on six HF bands (for 8 seconds each, repeating the
scan every 52 seconds). Recorders monitor the background noise of the band and
display the result in six color-differentiated (one color per band),
long-duration graphs displaying a total 6 hours of scans. When signals are
present on a band, its graph trace starts to resemble a series of vertical
bars.
Small, irregular jiggling of the graph traces is caused by changes in noise
level and by the reflection of noise off the D Layer of the ionosphere, Schwarz
explained.
The web link is updated every 10 minutes.
For more information, contact[4] Alex Schwarz, VE7DXW.
[1] http://www.nsarc.ca/hf/rf_seismo/main.html
[2] http://www.tapr.org/pdf/DCC2011-MDSR-BiLiF-VE7DXW.pdf
[3] http://www.nsarc.ca/
[4] mailto:alexschwarz@telus.net
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