Maybe it is because of VDOP values being higher. But I have measured a point with both the L5 antenna and the facet and my facet seems to be consistently low when checking into said points. I use the h1 and h2 measurements on each respective antenna using a spark fun rod (with tip cover removed). H…

[image] AORPLS: So are those the heights we should use to get accurate heights? I assume we want the RF measured phase center Yes, use the values from the NGS Calibration for both antennas :wink:

I noticed that the label on the facet corresponds to the RTK 61.4 and 57.4 above but the website shows something off a magnitude of difference? [Screenshot_20250126_081334_Chrome]

That’s the differences in Physical/Mechanical Phase Center and the actual RF Measured Phase Centers. [image] What't the height of antenna, GNSS Multi-Band L1/L2 Surveying Antenna - TNC (TOP106) Other Since I was already on the NGS page : The Facet - SFEFACET Actual L1 P…

So are those the heights we should use to get accurate heights? I assume we want the RF measured phase center and lowering the height slightly might get me to perfect elevations per the geoid

Just looking at L2 being a difference of 3 cm that would explain my .1 off a benchmark for local benchmarks

Big thanks my engineer friend! Oh by the way we even have the same name :slight_smile: Time to go do some more experiments today. This stuff would be important for doing FEMA elevation certs since you can do that with static. Also the reason why I’ve been playing around with all this stuff prior to…

[image] AORPLS: Big thanks my engineer friend! Oh by the way we even have the same name :slight_smile: We are practically kinfolk.

Measured height facet vs L5 antenna

GPS/GNSS

rftop January 26, 2025, 4:17pm 3

That’s the differences in Physical/Mechanical Phase Center and the actual RF Measured Phase Centers.

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Measured height facet vs L5 antenna

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