{"id":41,"date":"2009-06-22T18:39:59","date_gmt":"2009-06-22T17:39:59","guid":{"rendered":"http:\/\/projects.kmi.open.ac.uk\/era\/vowlan\/?p=41"},"modified":"2009-09-24T13:39:03","modified_gmt":"2009-09-24T12:39:03","slug":"first-vowlan-field-tests","status":"publish","type":"post","link":"http:\/\/projects.kmi.open.ac.uk\/era\/vowlan\/2009\/06\/22\/first-vowlan-field-tests\/","title":{"rendered":"First VoWLAN field tests"},"content":{"rendered":"
\"Curious

Curious cows. A hazard that distinguishes our field testing from our lab based testing.<\/p><\/div>\n

Today we did our first set of antenna tests as part of the JISC funded Portable VoWLAN project. We went out into the wilds of Old Wolverton and set up a pair of Linksys WRT 54GL routers at a distance of 100 meters in the morning and then a distance of 1.3 kilometers in the afternoon, to compare the performance of a range of antenna. <\/p>\n

We used the iperf program to identify the (tcp) bandwidth and (udp) jitter values from a 60 second test. Here’s a quick summary of the findings…<\/p>\n

<\/p>\n

100 meters: Base server \/ far client (i.e. from far to base)<\/h3>\n\n\n\n\n\n\n
Distance<\/th>\nBase ant.<\/th>\nFar ant.<\/th>\nBandwidth (Mbits\/s)<\/th>\nJitter (ms)<\/th>\n<\/tr>\n
100 m<\/td>\nRubber duck<\/td>\nRubber duck<\/td>\n13.650<\/td>\n0.113<\/td>\n<\/tr>\n
100 m<\/td>\n8dB Omni<\/td>\nRubber duck<\/td>\n20.982<\/td>\n0.062<\/td>\n<\/tr>\n
100 m<\/td>\n8dB Omni<\/td>\n14dB Panel<\/td>\n20.631<\/td>\n0.022<\/td>\n<\/tr>\n
100 m<\/td>\n14dB Panel<\/td>\n14dB Panel<\/td>\n20.801<\/td>\n0.271<\/td>\n<\/tr>\n<\/table>\n

 <\/p>\n

100 meters: Far server – base client (i.e. from base to far)<\/h3>\n\n\n\n\n\n\n
Distance<\/th>\nBase ant.<\/th>\nFar ant.<\/th>\nBandwidth (Mbits\/s)<\/th>\nJitter (ms)<\/th>\n<\/tr>\n
100 m<\/td>\nRubber duck<\/td>\nRubber duck<\/td>\n11.563<\/td>\n2.158<\/td>\n<\/tr>\n
100 m<\/td>\n8dB Omni<\/td>\nRubber duck<\/td>\n19.175<\/td>\n0.683<\/td>\n<\/tr>\n
100 m<\/td>\n8dB Omni<\/td>\n14dB Panel<\/td>\n21.655<\/td>\n0.144<\/td>\n<\/tr>\n
100 m<\/td>\n14dB Panel<\/td>\n14dB Panel<\/td>\n21.176<\/td>\n0.034<\/td>\n<\/tr>\n<\/table>\n

 <\/p>\n

1.3 kilometers: Base server \/ far client (i.e. from far to base)<\/h3>\n\n\n\n\n
Distance<\/th>\nBase ant.<\/th>\nFar ant.<\/th>\nBandwidth (Mbits\/s)<\/th>\nJitter (ms)<\/th>\n<\/tr>\n
1.3 km<\/td>\n14dB Panel<\/td>\n14dB Panel<\/td>\n10.463<\/td>\n0.394<\/td>\n<\/tr>\n
1.3 km<\/td>\nYagi<\/td>\n14dB Panel<\/td>\n10.872<\/td>\n2.136<\/td>\n<\/tr>\n<\/table>\n

 <\/p>\n

1.3 kilometers: Far server – base client (i.e. from base to far)<\/h3>\n\n\n\n\n
Distance<\/th>\nBase ant.<\/th>\nFar ant.<\/th>\nBandwidth (Mbits\/s)<\/th>\nJitter (ms)<\/th>\n<\/tr>\n
1.3 km<\/td>\n14dB Panel<\/td>\n14dB Panel<\/td>\n10.157<\/td>\n0.139<\/td>\n<\/tr>\n
1.3 km<\/td>\nYagi<\/td>\n14dB Panel<\/td>\n10.393<\/td>\n0.234<\/td>\n<\/tr>\n<\/table>\n

 <\/p>\n

…from these results we can conclude that from this selection we should use 14dB Panel or 8dB Omni antennas.<\/p>\n","protected":false},"excerpt":{"rendered":"

Today we did our first set of antenna tests as part of the JISC funded Portable VoWLAN project. We went out into the wilds of Old Wolverton and set up a pair of Linksys WRT 54GL routers at a distance of 100 meters in the morning and then a distance of 1.3 kilometers in the […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[4,3,12,11],"_links":{"self":[{"href":"http:\/\/projects.kmi.open.ac.uk\/era\/vowlan\/wp-json\/wp\/v2\/posts\/41"}],"collection":[{"href":"http:\/\/projects.kmi.open.ac.uk\/era\/vowlan\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/projects.kmi.open.ac.uk\/era\/vowlan\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/projects.kmi.open.ac.uk\/era\/vowlan\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"http:\/\/projects.kmi.open.ac.uk\/era\/vowlan\/wp-json\/wp\/v2\/comments?post=41"}],"version-history":[{"count":14,"href":"http:\/\/projects.kmi.open.ac.uk\/era\/vowlan\/wp-json\/wp\/v2\/posts\/41\/revisions"}],"predecessor-version":[{"id":205,"href":"http:\/\/projects.kmi.open.ac.uk\/era\/vowlan\/wp-json\/wp\/v2\/posts\/41\/revisions\/205"}],"wp:attachment":[{"href":"http:\/\/projects.kmi.open.ac.uk\/era\/vowlan\/wp-json\/wp\/v2\/media?parent=41"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/projects.kmi.open.ac.uk\/era\/vowlan\/wp-json\/wp\/v2\/categories?post=41"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/projects.kmi.open.ac.uk\/era\/vowlan\/wp-json\/wp\/v2\/tags?post=41"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}