I use these antennas.
As I wrote earlier, I had areas with clear skies and the RTK signal was going out in exactly the same way as under trees. After replacing the antenna, the problem in those places where the signal disappeared now is always there.
Later, I will check in the second tractor where I have the ann-mb antenna or it is better with my base station in those places where the signal disappeared.
I am using GPS + GLO + GAL.
Hi Tynell!
I was looking for HC871 Tallysman antena but DigiKey has only this HC882 HC882 Dual-Band Helical Antenna + L-band | Tallysman.
Would you mind to share you opinion? I’m trying to build my RTK base station with Emlid M2.
A base station needs a clear view of full the sky, down to a few degrees above the horizon for best results any way. I feel like a survey antenna is better suited to the base station than the helix. But on the rovers, no doubt the helix has real advantages.
Although several helix antenna descriptions say they are good for base stations too.
The HC882 looks like it supports all the same bands as the 871, plus Galileo E5. But I’ll defer to @PotatoFarmer’s experience.
RF is such a black art!
Your base should be in a nice open location with a good clear view of the sky.
I use a survey style antenna with the M2 for base with great results. An mcx to (sma or tnc) adapter to get the M2 to adapt.
C$ 1.37 24％ Off | 1Pcs RG316 SMA Female Jack Bulkhead to MCX Male Plug Connector RF Coaxial Jumper Pigtail Cable For Radio Antenna 4inch~10M
C$ 98.19 20％ Off | GPS antenna 300D Survey High precision waterproof RTK GPS L1 L2 Glonass Galileo For ZED-F9P Trimble BD970 BD982 receiver
Survey style is the more accurate antenna. In perfectly flat, nicely open territory with little for trees or obstructions.
But if you have particularly crowded, overgrown, overhanging obstacles, hilly terrain, problems with losing gps signal. Helical antennas are a much better choice.
The tallysman hc871 and 882 are really great choices. You will not be disappointed tallysman antenna in rover position. Helical antennas also do not suffer from dust accumulation.
Tallysman is a great, and fairly priced brand building high quality antennas. I have also had success with these two, especially the stubby harxon hx-901. The HX 607 performed well but sticks up fairly high, Its a bit taller than my thumb.
C$ 92.89 20％ Off | Helix Antenna HX-901 HX-501 GPS L1 L2 L5 GLONASS GALILEO For RTK UAV GIS survey intelligent driving Replace CHX602A CH7609A
C$ 109.28 20％ Off | Helix Antenna HX-607 GPS L1 L2 L5 L-Band GLONASS GALILEO BDs QZSS For UAV GIS survey intelligent driving Replace CHX600A
For rover in challenging conditions helical is a great choice.
Thank you, Michael! Good points! I’ll change my shopping list 
Thank you, Tynell! You saved me reasonable amount of money!
Initially I planned to buy Ardusimple basic kit since it has antena and it’s a bit cheaper . But now I see that I need helical antena for my rover. So maybe I should go micro PCB + micro Ardusimple ? What could you suggest?
I have no experience with the ardusimple boards, but their function should be the same as any other ublox F9P. The M2 also is F9P based, but has a great UI and online caster that makes it suit the base position right out of the box.
I am building and testing POE based hardware at the moment so fairly out of the loop with the current AiO.
Hi Tynell!
Sorry for bothering you again.
Could you suggest what cable should I buy for HX 901 antena? I guess it’s a TNC to SMA cable?
Another question. What’s the maximum cable length for the Base Station? I’m going to order that antena that you suggested from Aliexpress.
Thank you in advance!
The end that goes into the hx 901 is a female sma
C$ 2.64 5％ Off | 2Pcs SMA Female Bulkhead Right Angle Plug RA 90 Degree Crimp For RG174 RG316 LMR100 Cable Lot RF Connector
You really have to watch because rpsma and sma will have the male or female in opposite connectors.
The other side will depend on what f9p variant you have chosen.
Most likely you will run into rg170’s, try to keep runs as short as practical, try to keep under 20ft with this type of coax.
Your line loss will depend on coax type, and its characteristics at 1500-2000Mhz.
There are very low loss coax, with very thick cross sections, and very high price tags.
You will need to choose what is best for the application you are building, there are many to choose from.
But the shortest run practical, is the best regardless of type used.
This might be a dumb question but i can see how you get from TNC to SMA but what board gets it to USB or UDP [ethernet cable] and will any helical antenna work like this ie a Raven MBA6.
I would sell the raven its almost the price of 3 F9P.
All GPS systems need an antenna, antenna cable, gps module, and data communications.
These can all be separate or packaged together in one.
For AOG you need a Receiver capable of making NMEA sentences.
A mate gave it to me,I am not over impressed with my ardusimple F9P it drops sats a lot the little 20 dollar chinese usb antennas seem to work as good and dont drop out at all but they cant do RTK and i wanted to try something better before buying anything else
Then something is wrong with f9p or most likely the antenna. What is the exact name of the antenna?
Or maybe f9p is set to use satellite system that does not have many visible satellites in your area.
Its an ardusimple RTK2GO lite package,it looses signal around trees and things where the $20 ebay usb antenna,s have no probs.Seems worse when RTK enabled but acuracy free to air is no better than the ebay ones.
Which is logical. When on RTK f9p can only use satellites that the base is also seeing at that moment.
What is your f9p settings?
Did you use a rover setup file for the f9p?
Could you give more details about your Chinese £20 receiver? I’d like to see if it is GPS only or if it supports other constellations.
I’m not aware of any RTK2GO from from Ardusimple (may have missed it), are you actually referring to SimpleRTK2B lite? Are you using RTK2GO for a correction signal? How far from your location?
In any case, higher accuracy in any case results to lower availability (more or less). But the SimpleRTK2B receiver should never provide lower availability when working in the same mode as any cheap receiver. The cheap receiver may not support sbas but if it did, it would give lower availability in SBAS mode than in autonomous but better accuracy with sbas compared to autonomous mode.
Your first message claimed F9P being worse, the second says it is no better, has something changed?
Which antenna did you get with your simplertk2be lite ?
I think its the ANN-MB-00 Antenna for GNSS dual band and yep sorry it is RTK2B lite .The other ebay antenna,s are just those G Mouse ones which are a Ublox 7 and you can reset them to 10 hz in u centre, cors correction is a bit over 20 kms next closest is about 35 kms and in answer to the settings i didnt set as rover didnt think you had to.
Anyone knows the difference between ha-901 and hx-901? Visually they look identical?
use better GSM/LTE modem it helps a lot