From Laurent-Guy.Bernier at metas.ch Mon Oct 9 06:06:21 2017 From: Laurent-Guy.Bernier at metas.ch (Laurent-Guy.Bernier at metas.ch) Date: Mon, 9 Oct 2017 13:06:21 +0000 Subject: [IGSSTATION-7154] WAB2: replacement of receiver and antenna Message-ID: <0ADD9A7EFD7AF942A5701EDFD6B96FE42296BBE1@metasmx02.ad.metas> Author: Laurent-Guy Bernier Dear colleagues, Our old Ashtech Z-XII-3-T receiver and its antenna were removed on 2017-07-28 after 13 years of operation. A new receiver Septentrio PolaRx5TR and a new antenna SEPCHOKE_B3E6 were installed on 2017-09-15. The new antenna is aligned above the WAB2 landmark with 0.1 mm accuracy. The new elevation is 1.3327 m. The WAB2 landmark is located on the roof of the METAS building. The antenna is mounted on a steel mast above the landmark. We now use a mounting device with micrometric screws that allows a precise optical alignment of the antenna vs the landmark. Note that before 2017-09-15 the previous Ashtech antenna was aligned by hand with an accuracy of about 1 cm and was positioned 5 cm lower. Moreover note that on 2016-05-10 the Ashtech antenna was dismounted temporarily to perform delay measurements and after remounting the antenna, a displacement of about 1 cm was observed with respect to the original position. We have updated the station log file and as soon as the new station log is approved we will start again to publish WAB2 data. Kind regards, Laurent-Guy Bernier Laurent-Guy Bernier, Ph.D. scientist Federal Institute of Metrology METAS Division Physics & Chemistry / Sector Length Optics & Time / Laboratory Photonics, Time & Frequency Lindenweg 50, 3003 Bern-Wabern, Switzerland Phone +41 58 387 06 45 Fax +41 58 387 02 10 laurent-guy.bernier at metas.ch www.metas.ch -------------- next part -------------- An HTML attachment was scrubbed... URL: https://igscb.jpl.nasa.gov/pipermail/igsstation/attachments/20171009/58698c19/attachment.html