ARLA/CLUSTER: WebSDR´s disponiveis online na Internet já suportam Meteor Scatter

[João Costa > CT1FBF]

WebSDR supports Meteor Scatter enthusiasts

The SUWS WebSDR, a popular resource for the Amateur Satellite and 434
MHz High Altitude Balloon communities, has recently been upgraded to
support VLF and 49.990 MHz for Meteor Scatter observations

The SUWS team hope that these new bands will further enhance the
capabilities of the WEB SDR, which already covers a large proportion
of the 2m, 70cm and 3cm Amateur bands.

The bands were added in order to try and replicate some of the work
already undertaken by Dr David Morgan 2W0CXV and to make the SDR
available as an on-line resource for others who are interested in
observing such phenomena.

http://amsat-uk.org/2015/06/09/the-generation-of-vlf-emissions-by-meteors/

Performance on the VLF bands is now quite good, but it still suffers
slightly from some electrical noise from other equipment in the site
and Sferic noise (Lightning discharges) from about 4 kHz upwards.

50 MHz is currently operating on a temporary antenna, but it is
possible to hear the local beacons and repeaters, plus more distant
Amateur stations during Sporadic E openings. So it is a good indicator
of band conditions, but is probably not quite sensitive enough at the
moment to allow detection of some of the weaker meteor pings emanating
from the BRAMS CW radar on 49.97 MHz and IEPR CW radar on 49.99 MHz

However 143 MHz is working well and Pings from Graves on 143.05 MHz
can be heard quite frequently.

Here is an example of how the WEB SDR can be used to detect meteors.

It is possible by looping a PC sound card input and output whilst
running a web browser, to use Spectrum Lab to display a waterfall of
the audio from the PC. Then by opening multiple instances of the WEB
SDR in the browser, selecting USB and setting each SDR instance to a
slightly different centre frequency and adjusting the filter
pass-bands. It is possible to concurrently capture plots from VLF
signals, IEPR, BRAMS and GRAVES and display them side by side on one
screen. Because the same PC, Browser and internet connection is being
used for all the signals, the plots should be almost time synchronous.



The SUWS team hope that these new enhancements will be enjoyed by
their users, and expect that further improvements will continue to be
made over the coming months.

Use the SUWS WebSDR at
http://websdr.suws.org.uk/

Radio Astronomy Group Meteor Scatter Workshop takes place in
Northampton on October 31
http://amsat-uk.org/2015/08/11/rag-meteor-scatter-workshop/

Getting started in Amateur Radio Meteor Scatter (MS)
http://www.geekshed.co.uk/getting-started-in-meteor-scatter-ms/

AMSAT-UK http://amsat-uk.org/
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