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<p>Author: Ardyukov Dmitriy</p>
<p><br>
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<p>Hello all!</p>
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</p>
<p>After system failure in Trimble 4700 receiver in February, we install Trimble R7 GNSS receiver with Zephyr Geodetic 2 antenna on pillar NVSK station, at 2016-03-16.
</p>
<p>We check GPS&GLONASS data from new receiver by TEQC and found very low quality of GPS data, 35%, at the same time GLONASS quality was around 90%.</p>
<p><br>
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<p>After prolonged analysis all older data from this receiver, and searching in press-releases about changes in firmware versions, we made one change in configuration of receiver: disable tracking of L5 (was enable), and from middle of DOY 118 we have now a
93% quality of GPS data, and 89% quality of GLONASS data in our data-files. </p>
<p>We hope, we solve this problem. </p>
<p>Data file DOY 118 has gap from 07:35 UTC to 10:37 UTC.<br>
</p>
<p><br>
</p>
<p>Our firmware version is 4.19, and problem with L5 tracking for R7 GNSS was fixed only in firmware ver. 4.71 (after 2.5 years from our fw date).</p>
<p><br>
</p>
<p>We don't plan upgrade firmware, and will work with old 4.19 version.</p>
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<p>WBR,</p>
<p>Dmitriy.<br>
</p>
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