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Trimble Zephyr Geodetic Model 2 (two types?)
I recently acquired a Zephyr Geodetic Model 2 (GPS+GLONASS) when I bought a used R7 receiver.
On the NGS antenna calibration pages there are two similar antennas: 55971.00 (trimble antenna code: GS) and 57971.00 (trimble antenna code: GE). The calibrations are very similar, typically differing by a fraction of a millimeter (probably in the noise of the calibration measurements.
The NGS page has a diagram of the 55971 but not of the 57971. I assume the dimensions are the same (for reducing slope measurements to ARP).
Anyone know what the difference is between these two antenna models? The 57971 has “RoHS compliant solder” after the name, which is some kind of hazardous material compliance spec, and the 55971 has “lead based solder” after the name. Is that the reason for the slightly different model number?
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