Thanks for this! very informative. I have one and i'm mounting it in the Chimera7 Pro V2. I also have the Jumper T20 Gemini so its a match made in heaven ! 🙂
Given that I currently design my own FC with integrated RX, I caught one mistake: "RF Frontend" actually refers the PA/LNA (and potentially filtering and antenna switching), while the SX1281 is called Transceiver/Radio. Great overview otherwise
can you help me, why this one better than for example some cheaper 10usd elrs receiver? i mean is it better range ? because camera feed drops wayyyyy sooner than your radio :/ im a noob, just trting understand how things work
@@BasementDwellerFPV-sf5wpYes, it does help with both range and reliability. Most 10$ receivers (with some exceptions) don't have an LNA/PA onboard so their telemetry is gonna be weaker than this one's and you'll have about 1/4 the range (mathematically, practically probably a bit more equalized). Furthermore: Reliability (the more important point imo). While ELRS is quite good with this, I've seen two failsafes (from me and a friend) at about 100m distance only. How? In both cases, the TX antenna was horizontal, leaving a null in the horizontal line outwards from both ends of the T antenna. When this null hits your drone (worst case while the drone has its antenna at a 90° angle to your remote's) then you'll have bad range. The second antenna helps lowering the risk of the TX and RX lined up 90° from each other, thus you have a lower chance of the RX not picking up the packet. Also: chop one antenna, and the other one is still good if you have two :)
Has anyone tried to use the Radiomaster RP4TD rx in Gemini mode with the BetaFPV SuperG ExpressLRS Module? What are the transmitter options available now for the RP4TD rx in Gemini mode? Any suggestions welcome.
Because your receiver is in the air and a much better hight and location. That 100mw will still massively out perform your ground 1W that’s having to contend with you, the ground and anything else around.
Sorry but I explained what Gemini is and if you want to know more this video goes into a lot more detail. ua-cam.com/video/070ndll2SEw/v-deo.htmlsi=bqknM4i0CcBWVo4P
The geprc one is true diversity. Yes this has been available for some time. But people dont make videos for other companies somehow. Radiomaster gets the news
@jumpstartfpv the geprc elrs receiver is true dual antenna diversity receiver. The RP4TD receiver is the first of its kind. All you have to do it Google it.
elrs diversity receivers have an Achilles heel, they cancel each other out and cause failsafe in close range if you are at 1W so if you are flying a long range quad at full 1W and when the quad comes back from a flight it will continue to failsafe around 1meter to 5 meters. i wish Mads Tech would do real world testing before recommending them. Radio connectivity related items are sensitive items that can make some people lose their UAV due to bad reviews and recommendations. elrs diversity is not ready by any means need to update and fix the issue of close proximity signal interference before they can make products for public.
@@thirtythreeeyes8624i didn’t have luck with dynamic power had failsafe 2/5 times but still that should be mentioned in the product description page or something MADs Tech should mention.
@@emon6436I also had failsafe when using dynamic power when I first switched to ELRS. My personal opinion is people should never use 1W… it uses excess power, creates heat which wears out components, and the real issue, it creates a ton of RF noise directly under your FPV goggles. 2.4ghz ELRS at 100mw was tested to 100km; and in my personal testing I’ve found ELRS drastically outperforms our 5.8ghz FPV feeds.
First of all how are you losing quad at 1-5 Meters range ? . I also would not really be specifically aiming to land a quad with in 1-3 meters of my self 95% of the time so again o don’t see how this is an issue even IF it happened. Secondly I have used the diversity receivers from others at 1W with no issue like you have mentioned. Thirds I always use dynamic power and it’s been massively improved in later firmware releases. As for making “bad recommendations” im sorry but that is nonsense.
And further to this let’s break this down more. Most of the diversity receivers have an LNA, it’s hardly surprising that 1W of rf power at 1-5M would be an issue if you were not in Dynamic Mode. This would stand for any RC system including crossfire and anything else. Saying this is an Achilles Heal of the ELRS diversity received and that I’m giving bad advice is like saying it hurts when you punch your self in the face but it’s my fault as I did not not tell you to not do it. FFS come on and use the hardware and product as it’s expected to be used. A high power RF system is always going to have an issue at very low range and take that into account with your behaviour. Stand 5M back front take off of landing, use dynamic mode. Alternately you could choose to set power output via a switch on your radio and then reduce it when you get closer. It’s not rocket science, they literally have a specific mode for this kind of thing so use it.
Radio Master are certainly making a great range of products there coming on strong,thanks for the review Ian.
Fantastic review, Ian! Thanks! 😃
Stay safe there with your family! 🖖😊
Thanks for this! very informative. I have one and i'm mounting it in the Chimera7 Pro V2. I also have the Jumper T20 Gemini so its a match made in heaven ! 🙂
Given that I currently design my own FC with integrated RX, I caught one mistake: "RF Frontend" actually refers the PA/LNA (and potentially filtering and antenna switching), while the SX1281 is called Transceiver/Radio. Great overview otherwise
can you help me, why this one better than for example some cheaper 10usd elrs receiver? i mean is it better range ? because camera feed drops wayyyyy sooner than your radio :/ im a noob, just trting understand how things work
@@BasementDwellerFPV-sf5wpYes, it does help with both range and reliability. Most 10$ receivers (with some exceptions) don't have an LNA/PA onboard so their telemetry is gonna be weaker than this one's and you'll have about 1/4 the range (mathematically, practically probably a bit more equalized). Furthermore: Reliability (the more important point imo). While ELRS is quite good with this, I've seen two failsafes (from me and a friend) at about 100m distance only. How? In both cases, the TX antenna was horizontal, leaving a null in the horizontal line outwards from both ends of the T antenna. When this null hits your drone (worst case while the drone has its antenna at a 90° angle to your remote's) then you'll have bad range. The second antenna helps lowering the risk of the TX and RX lined up 90° from each other, thus you have a lower chance of the RX not picking up the packet. Also: chop one antenna, and the other one is still good if you have two :)
I grabbed one a few weeks back, I'm still trying to find some info on the RSSI DBM since it reads as XX : 2, where xx is some number.
Has anyone tried to use the Radiomaster RP4TD rx in Gemini mode with the BetaFPV SuperG ExpressLRS Module? What are the transmitter options available now for the RP4TD rx in Gemini mode? Any suggestions welcome.
Got one on the way!
Congrats
Thanks Ian.
Will it support soft serial to allow another device to pass through the extra uart on the receiver?
What’s the point if 1w tx power if telemetry is only 2x100mw,s
Because your receiver is in the air and a much better hight and location. That 100mw will still massively out perform your ground 1W that’s having to contend with you, the ground and anything else around.
@@MadRC i use a tower like xjets old one
TBS Crossfire NanoRX Pro has 400mw Telemetry for Long Range pilots, kept telemtry and link over 150km on 1Watt Tango 2 👌
So how does it compare to existing BetaFPV SuperD 2.4G receivers, which were already available since last summer?
Throught the whole video no explanation what gemini is.
Sorry but I explained what Gemini is and if you want to know more this video goes into a lot more detail. ua-cam.com/video/070ndll2SEw/v-deo.htmlsi=bqknM4i0CcBWVo4P
Subscribed ❤
Can I hook two rp3 to same quad for true diversity? Not for Gemini just to have two dual antenna Rx?
Do you think it's possible the extra uart could be used to output telemetry to something like a digital VTX?
be nice to see this in 915mhz
They have that as well already. I have a video on it.
I've got a GepRC ELRS receiver with two antennas. Is this not the same thing? Hasn't this been an option for a while?
Receivers like the RP3 are not true Diversity. The RP3 switch between the one which has the best signal.
It's antenna diversity. It switches between antennas.
The geprc one is true diversity. Yes this has been available for some time.
But people dont make videos for other companies somehow. Radiomaster gets the news
@@jumpstartfpv Oh wow, didn't know that the gerpc one is true Diversity, nice to know!
@jumpstartfpv the geprc elrs receiver is true dual antenna diversity receiver. The RP4TD receiver is the first of its kind. All you have to do it Google it.
Does anyone know when radiomaster is going to release a gemini module?
Quindi posso acquistare qualsiasi trasmettitore Radiomaster e utilizzare i nuovi RP4TD?
Интересно, когда появится gemini система 900MHz
already in the Radiomaster shops
@@schweizerluchs7146 In the store with only 1 antenna transmitters
Did you know if betafpv Gemini Transmitter is full 1W transmitter on each antenna?, or 500mW like the jumper t20G? Thanks
The SuperG from betaFPV is 1W on each. I have a full review of it here ua-cam.com/video/070ndll2SEw/v-deo.htmlsi=HJvk7XeP1m2yFjR3
@@MadRC thank you
elrs diversity receivers have an Achilles heel, they cancel each other out and cause failsafe in close range if you are at 1W so if you are flying a long range quad at full 1W and when the quad comes back from a flight it will continue to failsafe around 1meter to 5 meters.
i wish Mads Tech would do real world testing before recommending them. Radio connectivity related items are sensitive items that can make some people lose their UAV due to bad reviews and recommendations.
elrs diversity is not ready by any means need to update and fix the issue of close proximity signal interference before they can make products for public.
You can use dynamic power.
@@thirtythreeeyes8624i didn’t have luck with dynamic power had failsafe 2/5 times but still that should be mentioned in the product description page or something MADs Tech should mention.
@@emon6436I also had failsafe when using dynamic power when I first switched to ELRS.
My personal opinion is people should never use 1W… it uses excess power, creates heat which wears out components, and the real issue, it creates a ton of RF noise directly under your FPV goggles.
2.4ghz ELRS at 100mw was tested to 100km; and in my personal testing I’ve found ELRS drastically outperforms our 5.8ghz FPV feeds.
First of all how are you losing quad at 1-5 Meters range ? . I also would not really be specifically aiming to land a quad with in 1-3 meters of my self 95% of the time so again o don’t see how this is an issue even IF it happened.
Secondly I have used the diversity receivers from others at 1W with no issue like you have mentioned.
Thirds I always use dynamic power and it’s been massively improved in later firmware releases.
As for making “bad recommendations” im sorry but that is nonsense.
And further to this let’s break this down more.
Most of the diversity receivers have an LNA, it’s hardly surprising that 1W of rf power at 1-5M would be an issue if you were not in Dynamic Mode.
This would stand for any RC system including crossfire and anything else.
Saying this is an Achilles Heal of the ELRS diversity received and that I’m giving bad advice is like saying it hurts when you punch your self in the face but it’s my fault as I did not not tell you to not do it.
FFS come on and use the hardware and product as it’s expected to be used. A high power RF system is always going to have an issue at very low range and take that into account with your behaviour. Stand 5M back front take off of landing, use dynamic mode.
Alternately you could choose to set power output via a switch on your radio and then reduce it when you get closer.
It’s not rocket science, they literally have a specific mode for this kind of thing so use it.