Proposal antenna for rover

[kikislater]

Hi Francklin,

I found this antenna which seems to be the same as the implemented ebee one or heliceo or drobit system => 25g

Antenna Spec Frequency Range GPS L1/L2 GLONASS L1/L2 BDS B1/B2 Impedance 50ohm Polarization RHCP Axial Ratio ≤3dB Azimuth Coverage 360° Output VSWR ≤2.0 Peak Gain 2dBi LNA Spec LNA Gain 33±2dB Noise Figure ≤2dB Output VSWR ≤2.0 Operation Voltage 3~12VDC Operation Current ≤55mA Ripple ±2dB Mechanical Spec Dimension ¢27.5*59mm Weight ≤25g Connector SMA Environment Spec Operating Temp -40℃～+70℃ Storage Temp -40℃～+70℃ Humidity 95% No-condensing

http://gpsworld.com/harxon-offers-new-gnss-helix-antenna/

http://www.harxon.com/products-detail.php?ProId=83

[kikislater]

An idea about price is ~250€ without freight cost

[Francklin2]

A bit expensive but it will be a nice one for the rover (25grams) or a good alternative for the talysman, we can add it to the shopping list of the readme

[Francklin2]

Around the same price I saw this new one at Csgshop, not really a antenna because it got the intégrated M8T , it could be a middle price solution for the rover side (there is cheaper ones aroud 90$ at Drotek or Csgshop) http://www.csgshop.com/product.php?id_product=222

http://www.csgshop.com/img/p/222-518-thickbox.jpg

[kikislater]

With this size and weight of 25g, there are some different and a little bit cheaper for L1 ~around 180$

Model Frequeny HX-CH4601A GPS L1/L2，GLONASS L1/L2 HX-CH6601A GPS L1/L2，GLONASS L1/L2 BDS B1/B2 HX-CH3602A、HX-CH3603A、HX-CH3604A GPS L1、BDS B1、GLONASS L1

Of course your M8T you list is cheaper but only L1

[Francklin2]

We can propose a list of compatible GNSS and antenna in different prices range, I only search for the low cost side GNSS for the moment (Ublox,Skytrack or NVS) http://navspark.mybigcommerce.com/ns-raw-carrier-phase-raw-measurement-output-gps-receiver/ http://www.navspark.mybigcommerce.com/ns-hp-rtk-capable-gnss-receiver/

[kikislater]

According to ublox specs we could have 10Hz with setting only GPS or GLONASS in M8T P7/35 => https://www.u-blox.com/sites/default/files/NEO-LEA-M8T-FW3_DataSheet_(UBX-15025193).pdf

May be usefull for rover on a drone

[Francklin2]

Yes the M8T can run at 10hz, you have to set it in Ucenter, to change the refresh rate in hz, you have to change the timing in ms to 200ms instead of 500ms., over 5hz some values become red but it works i will add how to setup the M8T in the wiki

[kikislater]

Before known test, I prefer using 10Hz on a drone : more reliable

[kikislater]

Francklin, did you see the latest version : https://pixhawk.org/dev/rtk-basestation-touch-tft

[Francklin2]

Yes I saw it, I have build the first version without screen and we started our project in the same time, we can tell him that our project is released too., I didnt try his software yet because It need the correct touchscreen . I will try to download it to see how he extract the info from rtkrcv. For the rover part I noticed that the Drotel Smartnav is not too expensive (288€)