North Queens TV White Space Trials
The Effects of the Technical Specifications
On this page we will look at the effect of the technical specifications for the equipment which are influenced by regulation, what the manufactures can produce economically and our unique terrain.
For the computer predictions below we have assumed the 6Harmonics GWVS4000 radios which is type approved for the various classifications and emissions profile at the power levels shown and are the radios we used throughout these trials. The 3 classifications are
1)FCC Federal Communications Commission of the United States
2)ETSI European Telecommunications Standards Institution
3)ICSA Independent Communications Authority of South Africa
Note although FCC rules permit higher power levels to date (August 2017) manufactures have been unable to economically produce equipment capable of staying within the emissions profile.
The attached KMZ file (which opens in Google Earth) shows the predicted coverage from Tefler Hill located nearly in the middle of the community of Caledonia NS. approximately 2km from our 2nd test site where we hope to set up a community internet service.
The coverage maps assume a 30m base station antenna height and 9m at the subscribers premises and 6Mhz channel width. To get the performance we have shown the base station would have to use a 120 degree sector antennas (3 bases on different channels) and the subscribers would need a log periodic Yagi antenna with a beam width of ~30 degrees
Areas in red signal strength greater than -75dBm and in yellow greater than -85dBm
The illustrations below can be seen in greater detail in Google Earth using the KMZ file
In our area we fall within the protected contour of only one channel although it is very hard to receive due to our terrain and vegetation, we did a a series of spectrum scans in May which are available here.
We note that most rule sets for TVWS have a separate classifications for rural areas, these include the Federal communications commission (FCC United States) European Telecommunications Standards Institution (ETSI) and the Independent Communications Authority of South Africa (ICSA)
Questions, comments or suggestions are welcome, please use the contact link below.