Calibrated Antenna

Q&A forumCategory: QuestionsCalibrated Antenna
Thomas Duffy asked 3 months ago

Is the calibrated antenna the same as the OEM Beitian BT-151?  They look virtually indistinguishable from the outside.  I ask because I already have multiple BT-151 and would prefer to use them versus buying new antennas from Ardusimple.  If they are somehow different I’d prefer to use the Ardusimple antenna as it has the NGS calibration, but if they are the same this will save me money.

Ardusimple Staff replied 3 months ago

Hi Thomas,
No, they are not the same. The plastic might look the same as many vendors use the same molds to produce the plastic shell, but is the antenna inside what is different. I’m not saying Beitian antenna are better or worse, i’m just saying they are not the same. If you are not doing postprocessing or can afford extra 0.5cm error, non calibrated antennas are enough.

Thomas Duffy replied 3 months ago

All the same, I’m going to send one of my BT-151 off to NGS to test as a clone of the calibrated antenna. If it comes back as significantly different perhaps I’ll send in more BT-151 to get this antenna calibrated. It’s not difficult for a company to slap a sticker on a cheap Chinese antenna and send in to NGS to calibrate and then charge a premium. I’m not saying that’s what Ardusimple did, but I’d like to know for sure.

Ardusimple Staff replied 3 months ago

Thanks for the extra information. Don’t get me wrong, we tried several antenna designs with same shell, some where “calibratable”, some were not. All these attempts were done by an employee which has a salary, thus a reason for part of this extra cost that is not fair to add to other products.

If Beitian is using the same subcomponents as us, only NGS can tell, but i would be surprised as there are many subcomponents inside that we source from different vendors.

We wouldn’t like that our own forum confuses our customers. It will always be cheaper for an individual to go and buy a product from a Chinese vendor, there’s no doubt about this. We would like to explain what is the difference between buying from ArduSimple instead of Chinese vendor:
– Guarantee of availability of the same product for 5+ years
– Stock is kept in Europe for shipment next day, worldwide delivery in 2-4 days.
– We certify compliance with the regulations of several countries (e.g. no lead inside, no EMI emissions)
– No components inside will be changed without notifying NGS
– 2 year warranty

All this adds up as cost for a western vendor that just buying from China as individual can be saved. By buying ArduSimple you support this project where we are trying to make high precision simple and affordable for everyone.

Thomas Duffy replied 3 months ago

Thank you for this detailed explanation. I have been debating purchasing several Chinese antennas and sending them to NGS for calibration for some time. The reason I haven’t is because there is no good way to ensure that the Chinese factory doesn’t make internal changes and then ship you a batch that looks like the calibrated antenna but it’s vastly different. I did go ahead and purchase one of the calibrated antennas. As an aside, I saw that NGS calibrated an ANT3 ardusimple antenna just a couple of days ago. What is different with the ANT3 and when is that going on sale? Hopefully I don’t have buyers remorse from buying the ANT2.

Ardusimple Staff replied 3 months ago

Hi Thomas, thank you for your trust.

We are indeed testing a new antenna design with L1/L2/L5 + Lband(L6) support. Is not an antenna for zed-f9p but for other receivers. It’s not decided yet if we will launch this product or not, so currently i cannot confirm if and when will be sold. But the current antennas will remain in the portfolio for the years to come.

clive1 replied 2 months ago

Got a GEO++ ROBOT ANTEX file for the ANN-MB, really relies on the consistency in construction and assembly.

Pavlo Kravchenko replied 2 months ago

How to get ANTEX for ANN-MB?
Is it public available?
What ground plane size used for calibration?

clive1 replied 2 months ago

I requested it, no, assume it is the 150mm diameter used by AMO for the other portions of their antenna validation docs/specs. Tests were done down into L5/E5a band.

Pavlo Kravchenko replied 2 months ago

Requested from whom? U-blox or Geo++?
What their min/max PCV?

Pavlo Kravchenko replied 2 months ago

Where I can request ANTEX file for the ANN-MB?

1 Answers
Mauro Bettella answered 2 months ago

I heard Beitian is organizing to have NGS calibration files for some of their antennas.