I am a licenced HAM radio opperator.
We have a network thrue a large part of Europe (and the world) connected with wireless connections.
(see hamnetdb.org).
I use a SXTsq Lite5 on a 10 mHz channel to connect to a local accespoint on a high tower.
The tower has an CPE with 43 degree opening, 16 dbi antenna en 27 dbm of power in to it.
From my side I use the SXTsq Lite5 with also 16 dbi antenna but I can only make 17 dbm of power.
With a litle bit of searching on the internet I came accros this forum, and found some usefull information but not everything I want to know.
So I took a bit of a risk and configured the settings to “no_country_set” and tund “superchannel” on, mode to “any”.
In “advanced” settings I put TX-power settings to “all rates fixed” and set it to 20 dbm.
That is 3 dbm more than officialy possible bij Mikrotik.
Now my connection is more stable, so tha’s a good thing.
Due to the fact that I am a HAM radio opperator I think about things like “splattering” on the frquency band.
Bij overpowering an tranmitting device it is possible that ik creates rf harmonics that ar not acceptable.
I don’t have a spectrum analyzer that goes up to ~ 6 ghz.
Does anyone ever overpowered a SXTsq Lite5 and mesured the rf spectrum afterwards?
Could you share a plot of it? Thanks in advance.
Second problem with overpowering is overheating and destroy the device.
Does anyone ever tested what is some kind safe to use as powerlevel that it at least survived a year or longer?
Mine is running on 20 dbm now, but only for a few hours now.
Note: I am not doing illegal things (well… we could discuss this, but it is some kind of legal).
Which ROS verdion are you running on your SXTsq Lite5? Tx power calculations have changed in the last few years and currently actual Tx power (output from RF power amplifier) is determined with the following rules:
use country regulatory limit (EIRP) for the used channel and reduce it by antenna gain setting
when one uses “no-country-set”, this check doesn’t apply
use manually set Tx power
use chipset capability (max Tx power depends also on actual modulation used)
And then transmit at Tx power, which is lowest of all the above checks.
With your setting of country it narrows down to two checks (manual Tx power setting and chipset capabilities) … and since it’s still observing chipset capabilities, it should not transmit any noise (due to driving PA to excessive output power).
I don’t know exactly what you mean with “ROS verdion”? ROS version? What is ROS?
The versions in the device at this moment are all 6.49.11 from 08-12-2023 (8 dec 2023).
It says it has an Atheros AT9300 in it.
Router Os Version (Hmmmmm… ROS!!!) is 2.9.31 .
I actualy see under the tab “Current TX Power” that there are differen levels.
Levels ranging from 16 dBm Tx Power - 19 dBm Total TX-power on HT20-7 to
22 dBm TX-Power en 25 dBm Total TX-power on 6Mbps.
Mine is set to “no-country-set” and “superchannel”.
Somewhere on this forum I have read that this wil allow to “overpower” the chipset and possibly even burn it.
Well, that’s not what I want, I want to overdrive it, but not destroy it.
By overdriving it, there is a shance to produce harmonic distorsion.
Yes, I meant ROS version … typing on a tablet (no tactile feedback from keyboard) is a RPITA. And ROS stands for RouterOS.
So your device is running ROS version 6.49.11 … but where did the “2.9.31” number came from? If it’s from “System → Routerboard” under “Current firmware”, then I’d strongly advise you to hit that “upgrade” button.
AFAIK it used to be possible to drive Tx power higher than chipset capabilities in older ROS versions, possibly until something like ROS version 6.45 or there about. But since a few years ago, the Tx power selection algorithm always considers chipset capabilities. There was a forum topic about this matter and @Normis (from Mikrotik) described it. I can’t find the topic now … Which means that it should be impossible to overdrive RF PA but it shoukd be possible to drive it to the maximum.
I’d say they see version 2.9.31 in the Registration table. This is how AirOS presents itself when connected to RouterOS.
So it probably has a UBNT CPE connected or is connected to a UBNT AP.
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