SPK6618H not on opus antenna menu?

[steve1428]

Hi all,

Does anyone know what antenna in the OPUS antenna pull down menu is the same as the SPK6618H?

[dilshana]

The HFX6618 antenna looks like a suitable alternative. It utilizes an older version of the same 6618 base element.

Antenna #/Type for SPK6618H antenna?

Originally, I used the Sparkfun TOP106 antenna as part of my PPP setup and I specified NONE/SFETOP106 as the Antenna #/Type in the rtkconv options when converting from UBX to OBS file format. This seemed to work well when I submitted the OBS file to CSRS-PPP. Now I’ve started using the SPK6618H GPS antenna and I specified NONE/SPK6618H as the Antenna #/Type and got this response from CSRS-PPP: Warning : Although an antenna record was located in the RINEX file, no phase centre information could be found in the IGS/NGS file for your antenna. Estimated height should be used with caution. Ensure that both the antenna type and the RINEX header record "ANT # / TYPE " are valid. What should I specify as the Antenna #/Type when using the SPK6618H antenna?

[steve1428]

great thanks, i dunno why sparkfun doesn’t want to provide such info upfront, maybe their stuff is just for more advanced users interested in spending hours looking for crucial information.

[rftop]

This info in on the forum and in the OPUS dropdown box.

If you ever get stuck, you can search the Calibrations database here:

Antenna Calibrations

In OPUS, it looks like this:

The OPUS list isn’t strictly alphabetical, so it’s a little fuzzy.

[rftop]

Also, this is a great time to point out the differences in the (2) antennas mentioned, according to the NGS Calibrations.

From the Calibration Files

Top106 [vs SPK8818]

Actual L1 Phase Center
2.66mm [vs 0.47mm] North
-3.23mm [vs -1.26mm] East
52.94mm [vs 48.02mm] Up

Actual L2 Phase Center
-0.29mm [vs 2.73mm ] North
3.54 [vs -1.87mm] East
48.05mm [vs 35.91mm] Up

Looking at the Calibration files, it’s also easy to see how “Not” using the North Arrow Reference Mark can quickly add half a cm error to a solution, before you even get started
This is the case for any antenna.

[steve1428]

thanks for the info guys!
I’m stuck on sending opus my data.
I collected about 800 files with pygpsclient on my pi and i concatenated them into one file.
opus didn’t like it
I’m going to retry with only an hours worth of observations.
I wonder if picking a few log files from each hour out of the 24 recorded would be a good strategy?

[rftop]

OPUS has A LOT of built-in data validation and checks… and is therefor very particular about the input file.

@steve1428

I collected about 800 files with pygpsclient on my pi and i concatenated them into one file.
opus didn’t like it.

This seems extremely optimistic to me. I’ve used OPUS many times, but I’m FAR from an expert.

If you are just starting out with OPUS [sorry for an assumption] , you may want to start with a 2 hour continuous mission recording the RAW GPS L1 & L2 Observables. Submit one RINEX file. There are a few great posts on this forum with tips & tricks using RtkConv to Generate the RINEX that OPUS will like.

Plenty of folks here can help ya… and good luck !