{"id":1583,"date":"2022-06-20T17:42:50","date_gmt":"2022-06-20T17:42:50","guid":{"rendered":"https:\/\/klubnl.pl\/wpr\/?p=1583"},"modified":"2022-06-20T17:42:50","modified_gmt":"2022-06-20T17:42:50","slug":"zevs-analysis-2","status":"publish","type":"post","link":"https:\/\/klubnl.pl\/wpr\/en\/2022\/06\/20\/zevs-analysis-2\/","title":{"rendered":"Analyzing ZEVS part 2 – 82.0Hz"},"content":{"rendered":"

In previous articles i’ve shown some typical ZEVS messages<\/a> , and an analysis of the amount of messages per day<\/a> .<\/p>\n

This repository has all of the scripts used during the analysis: https:\/\/github.com\/sq5bpf\/zevs-analysis<\/a><\/p>\n

So what more could we get out of the opublished ZEVS dataset<\/a> ?<\/p>\n

<\/p>\n

Analyzing the 82.0Hz carrier<\/h4>\n

Before and after the message an 82.0Hz carrier is transmitted. Sometimes it’s transmitted only for a while:<\/p>\n

\"\"<\/p>\n

And sometimes it is transmitted for much longer:<\/p>\n

\"\"<\/p>\n

So i did an analysis how many minutes the carrier is on each day. The analysis is done by the find_zevs_activity.py script.<\/p>\n

\"\"<\/p>\n

A large pdf file with the analysis is here: https:\/\/raw.githubusercontent.com\/sq5bpf\/zevs-analysis\/main\/zevs_activity.pdf<\/a><\/p>\n

It seems that the amount of minutes that i receive the 82Hz carrier each day is more or less the same (where there are 0 minutes, it usually means a problem with the receiver). But i can observe periods when ZEVS transmits much less of the 82.0Hz carrier:<\/p>\n

2021-11-30 - 2021-12-09\r\n2022-03-07 - 2022-03-13\r\n2022-05-17 - 2022-06-10<\/pre>\n
These dates don’t seem to match any historical events that i know of (maybe someone else has an idea what they might be?).<\/p>\n
During these periods the normal 1-3 messages per day is transmitted. The amount of messages per day can be seen here:: zevs_messages_perday<\/a><\/p>\n
Interrupted carrier on 82.0Hz<\/h4>\n
On 2021-10-26 at 9:00 ZEVS transmitted an interrusped carrier 82.0Hz:<\/p>\n
\"\"<\/p>\n
The same repeated on 2021-10-27 at 9:00:<\/p>\n
\"\"<\/p>\n
I found this while manually looking over parts of the spectrum.<\/p>\n
Amateur radio operators will often send dots (short carrier, break, short carrier, break etc) as a test signal. Maybe someone is also testing the ZEVS transmitter.<\/p>\n
If you use this work, or have any comments, please send me an email<\/p>\n
Author: Jacek Lipkowski SQ5BPF\u00a0 < sq5bpf (at) lipkowski.org ><\/p>\n
\"\"<\/p>\n
This article is published under the Attribution 4.0 International (CC BY 4.0)
\nhttps:\/\/creativecommons.org\/licenses\/by\/4.0\/<\/p>\n","protected":false},"excerpt":{"rendered":"
W poprzednich artyku\u0142ach pokaza\u0142em typowe komunikaty ZEVS , oraz analiz\u0119 ilo\u015bci komunikat\u00f3w dziennie . Repozytorium ze skryptami do analizy danych znajduje si\u0119 tu: https:\/\/github.com\/sq5bpf\/zevs-analysis Co jeszcze mogliby\u015bmy wyci\u0105gn\u0105\u0107 z\u00a0 opublikowanego zestawu danych ?<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[17,32,16],"class_list":["post-1583","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-82hz","tag-sq5bpf","tag-zevs"],"translation":{"provider":"WPGlobus","version":"3.0.1","language":"en","enabled_languages":["pl","en"],"languages":{"pl":{"title":true,"content":true,"excerpt":false},"en":{"title":true,"content":true,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/posts\/1583","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/comments?post=1583"}],"version-history":[{"count":6,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/posts\/1583\/revisions"}],"predecessor-version":[{"id":1604,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/posts\/1583\/revisions\/1604"}],"wp:attachment":[{"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/media?parent=1583"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/categories?post=1583"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/klubnl.pl\/wpr\/en\/wp-json\/wp\/v2\/tags?post=1583"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}