PR1KS536 antenna with the RUTX50

Teltonika Networks
1

Hi,
I had RUTX11, parameters was quite bad about 5down/1upload so I decided to buy RUTX50.

Now I have RUTX50 and one PR1KS536 antenna - it is connected to first left Mobile SMA port.
I have three standard “Mobile” antennas - which came with the devices - they are connected to the rest of Mobile SMA ports.

Is that OK? Should I have 4 pcs of PR1KS536 to have proper connection?
Should I connect it to the different SMA Mobile port?

Regardless of presence PR1KS536 antenna or “standard” below outputs are the same:

When I put SIM card to the cell-phone: Samsung A23 5G - it has 98down/47upload speed.
But when I am connecting my SIM card to RUTX50 it has about 12down/5upload speed.

Status → Network → Mobile:

Carrier aggregation Triple
Connection Band: LTE B7/LTE B1/ LTE B3
Signal strength: -46 (Excellent)
RSRP -84 (Good) / -64 (Excellent) / -72 (Excellent)
RSRQ -18 (Fair to poor) / -16 (Fair to poor)/ -17 (Fair to poor)
SINR -2 (No signal) / 1 (Fair to poor)
Network type 4G+ (LTE-A)

How to improve performance of my environment?
RUTX50+PRKS536 cost me 765EUR
Samsung A23 5G cost about 225EUR and it is ten times faster than Teltonika.

gsmctl -A 'AT+QCAINFO'
+QCAINFO: "PCC",3175,75,"LTE BAND 7",1,485,-83,-18,-47,4
+QCAINFO: "SCC",225,75,"LTE BAND 1",2,485,-64,-16,-28,1,0,-,-
+QCAINFO: "SCC",1599,50,"LTE BAND 3",2,485,-72,-16,-37,0,0,-,-
+QCAINFO: "SCC",6350,50,"LTE BAND 20",2,485,-56,-14,-25,0,0,-,-
2

UP, anyone?

3

I can’t help but I can confirm that I have very similar problems.

I have a RUTX50 with a Poynting 5G antenna. Initially the results were great. Speeds of 60-80 down and upload.

From one moment to the other that speed disappeared. Now varying from 5-10…

However if I put it in my iPhone I get speeds up to 120Mbps! I can’t explain why and I have asked the question and so far no decent solution. I will keep an eye on your question.

4

Hard to say what could be causing the issue here. Your signal parameters are great, and you should be getting much more speed even from an LTE connection.
Perhaps there is a possibility of carrier throttling?
The antenna setup is not idea, but it should not impact the speeds that much.
Perhaps you could clarify if the speeds are consistently 5down/1upload or does it vary?

5

Thank you for reply,

The speed on the cell phone is consistently perfect - 100 Mbps down and 50 Mbps up.
I believe that’s the maximum capability of the modem in the cell phone.

On the RUTX50 device, the speeds are as follows:
Download: ranging from 5 to 25 Mbps, with the majority being between 7 and 11 Mbps.
Upload: ranging from 1 to 7 Mbps, with the majority being around 4 to 5 Mbps.

I experienced similar or slightly lower speeds on the RUTX11, but I also encountered frequent disconnections.

Attached is a picture of the telecommunication mast, located approximately 150-200 meters from the router.

MicrosoftTeams-image (8)
MicrosoftTeams-image (8)1125×2000 269 KB

6

This is almost unusable, if at all. Having very high or high values for RSSI and RSRP don’t mean much if the signal quality is bad.

Looking at the picture, it seems you are in rural or semi-rural area so the mobile operator may have set the inclination of the antennas to cover the largest possible distance. So beeing very close to the cell tower means that you probably miss it and what you receive is a combination of an attenuated signal from another tower and a lot of interferences from reflexions from this one.
This can be checked if you have a map of the cell ids.

What do you get if you restrict the allowed bands to B20 and B28 ?

7

Just looked over the signal values again, and indeed, @flebourse is right. This is why all signal parameters are important, not only RSSI.
Since you only seem to be using LTE bands, using PR1KS536 should not be an issue, as it covers the needed frequency range.
Could you try checking the router further away from the cell tower in the direction that the sector antennas are oriented?

8

No, probably. All the installed antennas are omnidirectional so they will grab all unwanted reflexions from all directions this explains the unbelievably high RSSI value and crappy SINR.

One workaround would be to determine the location of the cell tower the router connects to (your mobile provider should be able to help you here, or try with LTEdiscovery on Android it has an arrow) and use a very directional antenna with a high gain. This one gave me entire satisfaction. You will need two sets for the RUTX50.

9

There is another possibility I may have missed, the router indeed connects to the tower 200m away and receives a signal so strong it is distorded before sampling.
Could you try:

  • with the four original antennas, what are the RSSI RSRP RSRQ and SINR values,
  • with two antennas only (at the outside connectors) idem what are the reported values ?
  • with two antennas, at the inside connectors ?

If this appears to be true you will need to add attenuators.