Low RSSI signal

[jufelap]

My question is.

Is there a difference in output signal strength between the FCC and EU versions? Why can't the output power be adjusted the same as at 900 MHz?

I have the EU version and I get a low RSSI alarm at 500 meters! Radio X20S receiver GR6. Antenna arrangement is correct, shouldn't be a problem. I have the latest software on both the Radio and the receiver.

The other issue is that it is a DLG model. So I am flying with a 1 cell lipo.

Does the output power have to do with the voltage and with 2 cells would my problem disappear?

However, almost everyone uses 1 cell because they can't fit the bigger battery or they need to charge it after a very short time :-(

[Ceeb182]

In 2.4Ghz FCC or LBT, the transmission power is exactly the same. So this does not influence the transmission range. The biggest difference between the FCC and European regulations (LBT for Europe) is on the transmission conditions: in FCC you transmit successively on a series of channels of the 2.4GHz band without worrying about the current occupation of the channel, in LBT you transmit successively on a series of channels of the 2.4GHz band but if the current channel is already occupied then the radio switches to the next channel to avoid radio frequency pollution (this is the LBT=Listen Before Talk principle). From my point of view, this difference is imperceptible.

In 900Mhz, the difference between the FCC and European regulations are more important because the authorized powers are different according to the uses, the emission frequencies are different (FCC = 900MHz, EU = 815MHz) and the occupation rate of the bands are different.

Concerning the battery voltage of the receiver, if I stick to the technical documentation of the GR6, the minimum voltage indicated is 3.5V, so it is possible to go up to 8% of the capacity of a single Lipo cell (it is prudent to set an alarm at 10-15%, i.e. 3.6V).

Being only a user, I leave it to FrSky to confirm or correct information presented here.

[jufelap]

A 2,4 GHz-es FCC-ben vagy LBT-ben az átviteli teljesítmény pontosan ugyanaz. Tehát ez nem befolyásolja az átviteli tartományt. A legnagyobb különbség az FCC és az európai előírások (LBT for Europe) között az átviteli feltételekben rejlik: az FCC -ben egymás után sugároz a 2,4 GHz -es sáv csatornáin anélkül, hogy aggódnia kellene a csatorna jelenlegi elfoglaltsága miatt, az LBT -ben pedig egymás után a 2,4 GHz -es sáv csatornáin, de ha az aktuális csatorna már foglalt, akkor a rádió a következő csatornára kapcsol, hogy elkerülje a rádiófrekvenciás szennyezést (ez az LBT = Listen Before Talk elve). Az én szemszögemből ez a különbség észrevehetetlen.

900Mhz -ben az FCC és az európai előírások közötti különbség fontosabb, mert az engedélyezett hatáskörök felhasználásuk szerint eltérőek, a kibocsátási frekvenciák eltérőek (FCC = 900MHz, EU = 815MHz), és a sávok foglaltsága eltérő.

Ami a vevő akkumulátorfeszültségét illeti, ha ragaszkodom a GR6 műszaki dokumentációjához, a minimális feltüntetett feszültség 3,5 V, így lehetséges, hogy akár egyetlen Lipo cella kapacitásának 8% -át is elérheti (körültekintő állítson be riasztást 10-15%-ra, azaz 3,6V-ra).

Mivel csak felhasználó vagyok, ráhagyom a FrSky -t, hogy erősítse meg vagy javítsa ki az itt közölt információkat.

Thanks a lot for the info! The alarm is set to 3.7 volts. Everything works perfectly up to 3.5 volts. But the RSSI low alarm also occurs at 4 volts and not only when I'm 300 meters high and far away, but 50 meters high 100 meters away from me. I have a log file, I will attach a picture. At one point the RSSI value drops , then comes back. It has done this far and near on several flights. I have also had telemetry also give an indication that it is low or intermittent. The RSSI is not even alerted and control is also interrupted for 1,-2 seconds. then returns. This is very not good. I don't want to crash the plane.

The question is still, why can't the output power be increased? Like in the 900 MHz range? I will do tests with other receivers. I don't think there will be much change. I wonder about the people who dare to trust a serious turbine plane to this.

People I know had the same problems with Taranis and Horus transmitters. A friend of mine who was really fed up bought a TBS Tracer Micro TX Starter Set which guarantees 10 km range. It's odd that I should have to put another manufacturer's external module into a brand new TANDEM to get safe control. I don't need 10 km, only as far as I can see, but if it says 2 km, then no lower than 500 m RSSI. I'm afraid to fly, when the connection will be lost and the model will be out of control.

[EngelMT]

You have a problem with hardware or mounting situation for sure. We checked the real range with a FPV and flight controller controlled plane. With GR8 receiver 3.6 km and with R8 Pro 3.7 km up to the point off fail safe.

By the way. In Europe the ETSI rules not allow to use more then 100 mW output with 2.4 GHz.

[EngelMT]

I think your issue is not right here in this GitHub group. You have to talk about with your dealer about it. Or send the products to a service point.

[pld74]

You have a problem with hardware or mounting situation for sure. We checked the real range with a FPV and flight controller controlled plane. With GR8 receiver 3.6 km and with R8 Pro 3.7 km up to the point off fail safe.

By the way. In Europe the ETSI rules not allow to use more then 100 mW output with 2.4 GHz.

Any idea what FCC 2.4 power output is?

[Ceeb182]

The transmit power in the 2.4GHz band is identical in FCC and EU-LBT: it is 100mW i.e. 20dBm (according to FCC test documents ID: XYF-TDX20HDSP and European standards)

[bsongis-frsky]

Nothing for Ethos team here :)

[jufelap]

Biztos gondja van a hardverrel vagy a szerelési helyzettel. FPV-vel és repülésirányítóval vezérelt géppel ellenőriztük a valós hatótávolságot. GR8-as vevővel 3,6 km és R8 Pro-val 3,7 km a pontig hibabiztos. Mellesleg. Európában az ETSI szabályok nem teszik lehetővé 100 mW-nál nagyobb teljesítmény használatát 2,4 GHz-en.

Van valami ötlete, hogy mi az FCC 2.4 teljesítmény?

I also think it might be a hardware problem. And the transmitter. Since I have tested with a GR6 receiver and I have a brand new one of the GR8 receiver, I tested with that one too.

I found no difference in range. The range check is correct at 30-35 meters. Even more.

Perhaps a very slight GR6 was weaker, as the receiver and antenna installed does not provide 100% placement.

On the GR8 receiver I had the antennas positioned most correctly.

My test was not 3.6 km, but 700 meters and I had a critical 35 decibel signal. In fact, if I don't point it towards the receiver, sometimes it breaks.

So the problem is not with the receiver but with the transmitter. I'm still going to make test with my old radio HORUS X10 to negsure it's really transmitter fault. Unfortunately I still need to install the new RF module and install the new software to handle the ARCHET GR8 receiver. I will report back on my experience.

Translated with www.DeepL.com/Translator (free version)

[jufelap]

Itt semmi az Ethos csapatnak :)

For me, this is not such a ridiculous mistake. :-(

[EngelMT]

@jufelap We believe you that the problem exists and no one believes that this is a ridiculous mistake. But it has nothing to do with ETHOS and is therefore not right here.