<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Dear colleagues,<br class=""><br class="">this is a heads-up concerning the next GPS week rollover which will occur during the night from April 6-7 2019. The rollover occurs every 19.7 years and<div class="">unfortunately will happen just in the middle of the upcoming GMVA session.</div><div class="">You can find more details under:</div><div class=""> <a href="https://www.gps.gov/cgsic/meetings/2017/powers.pdf" class="">https://www.gps.gov/cgsic/meetings/2017/powers.pdf</a></div><div class=""> <a href="https://www.gps-repeaters.com/blog/gps-week-number-rollover-april-6th-2019/" class="">https://www.gps-repeaters.com/blog/gps-week-number-rollover-april-6th-2019/</a><br class=""></div><div class=""><br class=""></div><div class="">Most (modern) GPS receivers should be able to cope with the rollover, however with some units we might expect problems of</div><div class="">incorrect dates etc. You might want to check whether your station receiver is ICD-200 compliant. In any case stations should </div><div class="">pay attention to the GPS unit at the time of the rollover and be prepared to manually solve any problems should they occur.</div><div class=""><br class=""></div><div class="">Thanks to Juan Penalver (IRAM) for bringing this up.</div><div class=""><br class=""></div><div class="">Regards,</div><div class="">Helge</div><div class=""> <br class=""><div class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; orphans: auto; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><span class="Apple-style-span" style="border-collapse: separate; font-variant-ligatures: normal; font-variant-east-asian: normal; font-variant-position: normal; line-height: normal; border-spacing: 0px; -webkit-text-decorations-in-effect: none;"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; border-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-stroke-width: 0px;"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; border-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-stroke-width: 0px;"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Helvetica; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; border-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-stroke-width: 0px;"><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div class="">------------------------------------------------------</div><div class="">Helge Rottmann</div><div class="">Max-Planck-Institut für Radioastronomie</div><div class="">Auf dem Hügel 69</div><div class="">53121 Bonn</div><div class="">Germany</div><div class=""><br class=""></div><div class="">Tel: ++49 (0)228 525 123</div><div class=""><div class="">------------------------------------------------------</div></div><div class=""><br class=""></div><div class=""> </div></div></span></div></span></div></span></div></span></div></div>
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