About wooded places. If is it forest and antenna tallysman maybe. If it is garden or park or line of trees in field it work mainly fine with tallysman antenna, with round antenna work better on ~ 20%. But you must make measurement twice. 1st measurement and then you must lost fix and stake out point for control it.
It was test, i whant to know “can i get wrong fix on emlid m2”. I took it
That’s a great design Nykodym ! I designed my mount for the Emlid helical antenna using PVC pipe and just have the receiver and battery in a small hip bag hanging on the bipod. I’ve since changed antennas to the Harxon GPS 500.
I think the M2’s are great receivers. I mainly use my two M2’s for a static baseline on project sites when using my Javad receiver as a rover accessing the state RTN service. Using 3 receivers gives me a closed polygon if I loose cell coverage with the rover. I can then PP the rover with the M2’s and have a verified position for the rover points. Sometimes if I have the time, I’ll PP the rover even if it has an RTN position. Accuracy comparing RTN versus PP is usually less than 2cm horizontal and vertical. The baseline lengths are usually less than 2 km. As I’ve said many times, short baselines are your friend.
If you have 2 other receivers, you might consider trying this. It gives you absolute confidence in all of your rover points.
On the end of this history it is very impotent what antenna are you use with emlid m2. On this moment best is beidou, then tallysman, then ashtech ptomark. I whant to test also Leica AS05 antenna. I think that antenna is main part in wrong fix result.
Short yes, but 50 km also will work fine. I test baseline 97km in postprocesing. On control point it was difference ~90mm.
Good work, i don’T UNDERSTAND how you integrate 5/8" adater for pole in your box.
I print this adapter, but it is from plastic, metal wil be better.
---- my concept - one box and 2 types of antenna
i will work to make box like emlid rs2, maybe with lora radio.
Wow !!! That’s pretty sharp and very professional looking ! I don’t understand why Emlid hasn’t designed something like this. It would certainly increase sales for Emlid from a lot of surveyors.
I just used a 5/8" x 11 female/male adapter. I used a drill press to drill holes for the end caps. The helical antenna just had two small screws for mounting… I counter sank the base into the end cap about 5 mm to give additional support.
Your design is very good. When I saw your video, it looked like it was made by some manufacturer.
Thanks for your posting Nykodym !
Your idea better. I think about such box, but main problem, i don’t understand how to integrate 5/8 metall adapter into plastic box. Can you show picture how are you do this?
Also good idea to use antenna BT-560. It is cheaper in 3 times. See it on aliexpress. It have good reviews.
I’ll be chiming in here. Not much left for me to stress out, though.
What you have to check before attempting the survey is the environmental conditions. That’s the first, the most obvious but the most important trick if you want to predict the results. Knowing that the conditions will present a struggle, you might want to move from GNSS equipment on this specific area at all.
During the survey, you can monitor the DOP value to be lower than 2, the age of differential to be less than 2 seconds, RMS value to be within cm limits. Also, it’s a good practice to consider increasing the point observation time.
Still, harsh conditions are harsh conditions. There’s no going away from the fact that your environment should be reasonable for the GNSS equipment to do its work. That’s why the general working site won’t present any bizarre results.
P.S. Nykodym and Brian, both your designs for M2 look astonishing. The main thing here would be to make sure Reach has enough air for ventilation. Otherwise, there’s always a risk of watching the unit get hotter and hotter. Regarding the design from us, I feel your wish, truly. But as we designed modules for mainly the UAV use, there are no plans to introduce any other housing for now.
The mask and consideration of the quality of the satellites is also very important. This will somewhat be reflect in the DOP values but satellites can bounce around and your DOP’s may look ok at moment. It would be nice to have a sky plot of what Reach is seeing but in general the mask can take care of allot of ground obstructions.
My M2’s get warm but never “hot”. I’m thinking it could be due to the length of the power cables. Shorter cables transfer the power needed more efficiently, therefore more heat is generated. My power cables are pretty long, maybe that’s why mine never run hot.
I’m just a land surveyor not an electrical engineer.
Michael, totally! Both SNR and elevation masks can help manipulate the result a bit I also get the request of the sky plot in the ReachView app, we’ll see what we can do here.
Brian, the long cables may be a source of the signal loss as well. But it seems like you strike a good balance here. That’s the main thing, generally too
Thank you. Yes, i think it can be a trouble for me. I will make foto of intrance maybe. If i unboxing m2, maybe it will be better. Now i have window for indicators 25x5mm.
- Are you have statistic how much m2 was lost user becouse it have hot temperature? What will be if temperature more then max during using m2?
- Can you give some recomendations? How are you work about this problem in reach rs2?
I am agree, i change mask elavation to 30 and all was good.
I am don’t know how i must use consideration of the quality. It was 19 or like this.
How are you control it? How many hour it work befor you test temperature? What max temperature was outside in that time?
Most of my static sessions are about 6 hours for both the M2’s. Last one I did was about a month ago when the overall temperature outside in the field was about 85° (30° C) . I was basically using them as a static baseline along with my JAVAD Victor LS. They got warm but never that hot to the touch. I keep the battery and receivers in a small hip bag.
Here’s a couple of pics. You can buy the 5/8"x 11 adapter at most survey supply stores. The female end simply screws into the bipod or adapter on a tribrachs. I just bought a nut at a local hardware store for the male end which is inside the cap. The other hole is for the antenna cable out to the M2. I don’t keep anything in the PVC mount, it’s just for the helical antenna.
I’d like to make it bigger for the battery, M2 and LoRa; but I no longer use the helical antenna. The Harxon GPS 500 antenna simply has a 5/8"x11 female end for a survey bipod. I could mount the Harxon on top of the bigger PVC design and then have everything inside. However, I may have problems with overheating the M2 in the enclosure. The M2 and battery is in the hip bag hanging off the bipod.
Thanks for sharing your surveying designs with Reach M2! So many things to learn from you But they may be a bit much for thread now, though Feel free to move to the Project share category to discuss it further!
I’ll conclude it with the answers to Nykodym.
All our receivers have a failsafe mechanism: they won’t be heating up to the point of totally burning. They will shut down to prevent it. So there are no M2s that were totally lost, as you call it. Still, as overheating is dependent on the specific hardware setup, it’s hard to draw any average numbers.
It’s all about experimenting with what you have and how you want it to be placed. The main thing for the unit is to provide it with air. There are various ways to do that, of course: special perforation on the body, additional heatsinks inside your setup, etc. You can check it: maybe the unit is working fine for you as it is now.
Reach RS2 is a different topic altogether. Different construction, different details, different heat dissipation mechanism. As the battery is placed inside, we had to come up with the sort-of-internal heatsink. So RS2 is totally cool as it is (no pun intended).