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by anonymous
Hi, I replaced a RUT-230 with a RUT-240 connecting the main antenna port with the existing external antenna (directional) while using one of the two antennas that come with the router for the aux. The signal (3G) is very poor (between -90 and -100 dBm) and there was no benefit replacing RUT-230 with the 240. Is it worth it to install a second external antenna in the same position (on a small pole) of the main one? Is it possible that the router is not receiving the LTE signal at all because the aux antenna is different or in a different position that the main one?


1 Answer

+1 vote
by anonymous


Thank you for your question.

Do you have the ability to install the original antennas that came with RUT240 and test the signal strength?

I could be a lot of different reasons for poor signal, the antenna or placement of it could be one of them.

Here are a few general suggestions for signal strength improvement:

  • Antenna orientation. Trying different antenna positions may help create better signal conditions. Open your device's WebUI while experimenting with your antennas and look to the "Mobile" widget on the "Overview" page to see if the signal strength value changes based on antenna orientation. Leave the antennas in a position that provides the highest signal strength value. For more information on mobile signal conditions, visit the Mobile Signal Strength Recommendations page.
  • Frequency bands. Teltonika-Networks devices provide a manual band-lock feature. Experimenting with different available frequency bands may help in finding the best speed conditions. To learn how to lock bands, watch this video.
  • Location. Try moving your device around its environment to find better signal conditions. Try placing the device next to a window or other transparent material. If you have a clear view of the serving cell itself, try placing the device next to a window facing that cell.

Let me know if any of this helps.

Kind regards,


by anonymous
Thank you for the answer; the situation is quite tricky because the router is placed on a slope of a narrow alpine valley and the only cell tower (as far as we now) is located at the bottom of the valley; we don't have a free line of sight to the bottom of the valley because of the orography, so the only thing that helped was placing an external antenna on a pole to elevate it. Since two days, without any other our intervention, the router has gotten the LTE signal with a proper strength, probably because they are dismissing the 3G network and maybe they improved the 4G cells. Anyway my question was about the use and the correlation between the main and the aux antenna, in particular if the two antennas must be installed in the same way to get the best performance and if the aux antenna can be useful in this kind of context or its purpuse is to get the full bandwith from LTE when the signal strength is good.
by anonymous

In Teltonika networking devices, one mobile antenna connector is "MAIN", while the other one is "AUX".

Depending on what technology (3G/4G) is used to connect to the mobile network provider, the "AUX" antenna performs a different role:

  • When "3G" technology is used, the "AUX" antenna is used as a "diversity antenna" for error correction. Its effects are most noticeable in poor mobile signal strength areas.
  • When "4G (LTE)" technology is used, the "AUX" antenna is used both as a diversity antenna and as a secondary receiving antenna, increasing data connection quality and overall mobile download speed of the device.

It would be best if you could try to connect the second antenna for yourself and see if the mobile connection has been better, but in general, the second antenna should improve signal strength.

Kind regards,