Radiomaster Nomad & DBR4 Receiver - ExpressLRS Gemini X For Under $45

[@ScottTomlinson]

Can confirm it's awesome! Big ups to Jye and the ELRS team.

[@McShakyFPV]

I’ve been waiting for this! Next we need dual band moxon antennas for long range

[@robertklug3863]

Thanks!

[@ninjalemon_Squash]

The price is quiet amazing. Good times ahead for the people who were trying to unknowingly bind a 2.4GHz receiver with a 900MHz all this time.

[@Chillin-fpv]

😂🤣

[@maeluis6214]

Welcome to a new generation of pilots that don't need to understand about matching numbers to put a Fpv drone in the air 😂

[@SkermiebroTech]

Omg the amount of people who have messaged me about this

[@CapnBry]

Man what a great overview with plenty of details, great video Ian! I do not believe this will replace existing transmitters though because the LR1121 can't do FLRC at all, so F modes are completely out unless Semtech adds it to the chip. If they do, ExpressLRS webui now has a flasher for flashing the LR1121 firmware as well. You like firmware? We got like 19 firmwares per module now. Nobody can beat us on number of firmwares!

[@lasersbee]

The best Review and explanation of the Gemini and Gemini X systems that I have seen to date.

[@m3chanist]

A brilliant elaboration on gemini/ELRS , very clear and thorough. Cheers.

[@smithe68]

Fantastic level of detail on this new system! The first thing I’d want to do is replace all those short rx antennas with longer ones so they could actually be outside the body of a wing.

[@techstuff6829]

If the wing is foam or balsa or fiberglass they don’t really need to be outside the body.

[@smithe68]

@@techstuff6829 I thought that might be the case but I wasn’t sure, thanks for confirming that. I do like them further apart though.

[@fokusfpv]

it seems like this could be great for pro work - run one band on 2.4 and the other on 900 and you get the benefits of short and long range RX/TX combo (as long as the quad is running the new RX - which looks great as well!)

[@Chillin-fpv]

Now it makes sense why radiomaster never released their version of gemini.

[@fokusfpv]

thinking the same thing :)

[@CRO-dr4si]

Agree.

[@billmcdonald4335]

US$75 for both TX _and_ RX. Killer deal. Gotta love open source!

[@gammagonad1657]

So smart making one module that will fit JR and Nano.

[@dave882]

Awesome. Now to figure out where to run four antennas 😂

[@podex6354]

On a quad: maybe one on every arm Fixed wing: just stuff it somewhere 😂

[@northerntierfpv8947]

Thanks Ian, I know how Dual Band works now. Always good stuff! Cheers

[@JPMediaProductions]

Wow! This is impressive. Going to have to get one now. Now I gotta figure out where to those four antennas on the quad lol.

[@kedrickperkins331]

I would love for radiomaster to release this with the ability to replace the internal module of the boxer and tx26s

[@SuprDlux]

Game changing.

[@Rafa-pt7oh]

Buen trabajo,como siempre.

[@redreefbud]

Just like the betafpv true diversity i have been running for last year 😉😁 good stuff

[@giusepearturo]

This is perfect technology for large RC airplanes, both gasoline and turbine-powered, where maximum redundancy and safety are needed. Create PWM receivers, and you will gain a new, large market.

[@VladTepes44]

There are crossfire to PWM converters around. Matek has several that are pretty cheap including one with a Vario and GPS connectivity

[@giusepearturo]

@@VladTepes44 yeah but si Sketchie for a big plane, i had tried those but i don see a guy put that in a 10k jet

[@nvrmor023]

Just get frsky they have been doing this for years.

[@406fpv9]

This is awesome! Might be a little difficult trying to fit a reciever that huge in a quad but still awesome!

[@Chillin-fpv]

It doesn't look any bigger than a 20x20vtx

[@TheCra6er]

5:07 I missed, why it is necessary to use vibration dampers?

[@petrusoroaga6528]

44 bucks it's a steal. Glad to live these times :))))

[@ugpfpv361]

Crossfire, who 🤔... Wow I like and will keep my betafpv Gemini, but $45!!!! Awesome, radiomaster is killing it!!!

[@AttentionDeficitHobbyDisorder]

Very excited to see so much new stuff happening with ELRS! I wonder if it would be possible to install the internals of this unit as an internal module. I've been considering the Gemini internal upgrade for my T20 V2, but if this could be installed with that same kit, that would be amazing!

[@_google_user_]

It's out now, in the mail from Radiomaster.

[@jerryFPV]

Final nail in the coffin for TBS crossfire?😂

[@jameswho5517]

Super interesting, now if only we got more BW :P Thanks for the info!

[@dennisvandervloet8640]

Amazing but so difficult at the same time 😅 I am allready glad my crossfire is working as it should 😂

[@VideoAve]

Thank you very much! I’m interested in getting the transmitter but I just want to be sure it will work ok with my existing old 2.4 GHz ELRS receiver.

[@techstuff6829]

Yes, it will, but only when using the LoRa modulation not FLRC.

[@speed2o7]

Why do I want this? It’s beyond overkill for what I do. 😂

[@JDsRCModelWorld-up7ws]

Great for aircraft...Drones maybe 7 to 10 inch!

[@Chillin-fpv]

I use the betafpv gemini module in my boxer with the radiomaster RP4TD receiver in my 5 inch quads. The LQ doesn't move below 99 I barely look at my rssi dbm and LQ anymore cuz that's how locked in it is. I really only look at my MBPS for my video feed cuz that's my ONLY limiting factor on far I can fly. Well, that and battery power. Gemini is absolutely incredible! Gemini x 🤯 hopefully it's 5 times better than gemini

[@ThorrFPV]

Hi Mad, love your videos! I am going to be trying to repair some drone parts. I don't really know how. Would you maybe be able to do a video on basic repair technics? Not really diagnosing, but what stuf to use and how to use it correctly.

[@UAVfutures]

heck yeah, awesome video and tear down brother.

[@Peter-z1h]

There is compatibility issue with the nano adapter. Does not fit with normal nano module bay found in Frsky radios and TBS Tango 2 module bay addon.

[@PeterBesenyei]

Could you please test Tandem and Twin FrsKy Transmitters, please on your Spektrum Analyser?

[@maxsteal1982]

@MadRC what do think are the best receiver antennas for this receiver?

[@TriMeX1987]

So what does the antenna mode do for this module ? Gemini I get but then antenna 1 and antenna 2 since they are both dual band I am guesing not alot ? and the last mode switch? Also I can confirm you need a 3d print for putting on a tango 2 and externa lipo power 6v -16.8v to run it. ( something you might want to know a head )

[@drelephanttube]

Hi Mads, love your videos. Can you please test latency on the janky new Walksnail Goggles X analog thingy?

[@skiseb04]

Is there any dual band long range antenna on the market for the TX ? The stock ones seems to be kind of limited for long range in X100 or X150 packet rate.

[@stevearmett1565]

Awesome overview ! I am brand new to Express ELRS and I have got this Nomad Gemini module for my TX 16S. I fly fixed wing and this allows redundancy and the Radio master ELRS RX's are literally half the price of mainstream RX's really impressed so far !!

[@sashgorokhov]

No screen and no RGB leds 😢

[@Bulu2898]

If my cake is in front of me believe I'm the only eating it. Hahaha awesome review 👏 😄.

[@chriswhitehead6095]

TBS was about to release a similar product in 2045, maybe! I am a Crossfire user.

[@SFPFPV]

So can we use the Nomad in dual 915mhz mode with a standard true D 915mhz rx and have 915mhz Gemini? 915mhz Gemini 100Full seems like the holy grail of LR ELRS.

[@techstuff6829]

Yes.

[@mtv14bvlos]

How does it compare for range capability to Doodle Labs Mesh Rider dual band which claims 80+ kilometers

[@SebastienChedalBornu]

how dual band antenna (with one RP-SMA connector) can be good on both band ? thrilled byu the product but this question keeps in my mind

[@cnw-jd9tt]

can you do a vid on what hz is best for what you do? such as 250 vs 333 full because thats something i still struggle to understand, i know that 500 is faster then 250 but what does d and full mean?

[@captain-22]

What if one chip sends alternate packets of 2.4 and sub900 , that way zero latency untill u loose one, and even then u still remain in control but in limp mode, should be a great feature for single chip rx/tx sets,

[@chrislappas1]

Hey Ian!! Can we fly this module in Europe???

[@garycaruso4883]

So Please!.. a dual band integrated Boxer Color screen next year?

[@TheCatFather01]

Amazing

[@MorningView]

rofl i just bought bandit nano module (on you recommendation!)

[@amgbenz77]

Can you swap the antennas for the 2.4 915 T band?

[@derrogers]

i never switched from 900mhz to 2.4ghz, probably the best time to do so... no need to switch all rx on the old gear...

[@stevietee10]

going to need a 20x20 blank board to stop the uFLS' popping off !

[@MadRC]

Possibly some glue.

[@MatCron]

you can also use bayckrc elrs very small same functions

[@NaorFPV]

maybe print with TPU

[@jimmytheriot8978]

In x mode what antenna is 2.4 and what antenna is 900 if we wanted to replace antennas for better ones while on x mode

[@BengalCatChilli]

Sorry, what was that Spekrum? 😂😂😂

[@SebastienChedalBornu]

@Mads Tech you confirm that the DBR4 got always 2 antennas that are connected but not used am i right ?

[@angelnunez6476]

It uses both at once unless you change it in radio settings on the tbs luascript

[@mfrfpv9079]

Can we get a starter kit with 3 elrs Gemini recivers ❤❤❤❤?

[@puneethff4927]

A great review brother thanks a lot , and a small question , like as it has 2 frequency bands and it can bind to both the individual receivers at once right ?? , so is it possible to use 2 receiver in a ardupilot , one to control quad and other one to get the telemetry data( like flashing the other receiver to airport we can use it as a telemetry receiver ) ? as i know we need 2 set of uart on the module to get this worked i think ?? like one to controll quad and another one to connect to laptop or mobile for telemetry data ? or am i wrong ? , like if this is possible then we will end of saving about a lot of money , like a quality telemetry module is from 60$ and it goes on ,, plz clarify me on this brother , it helps a lot

[@CapnBry]

Not at this time. Currently the same data is going on both connections and to a single dual band receiver.

[@fordboyzzzz]

that would be nice - long range telemetry. im guessing the 100mw telem does not go very far.

[@puneethff4927]

@@fordboyzzzz yes brother Like I have seen people using elrs for telemetry data Like they will use one 2.4ghz module and rx to controller quad And another 900mhz module and rx to get the telemetry data And these both the receiver should be connected to different uart ports

[@fordboyzzzz]

@@puneethff4927 yea but im after long range - they only 100watt. could prob put another nomad module in the glider to get it back maybe.

[@techstuff6829]

@@fordboyzzzz100mW telemetry goes surprisingly far actually, further than most will ever fly.

[@NorgeSquad]

Is it possible to hack it to 2W?

[@Fazzelgaming]

Does this one fit my taranis qx7?

[@jimmytheriot8978]

Can this bind to crossfire nano,cant seem to get mine to bind

[@rippfpv]

But is it better than the 2w version?

[@frank3722]

Can you better explain the 1800-1900 peak? It is only present when the module is broadcasting on 868/900MHz/ When you change to 2.4GHz, it is gone. I heard you blame a mobile carrier. Please explain. (around the 18:55 min mark)

[@techstuff6829]

It’s a harmonic of the 900MHz signal, it’s there on the Bandit and TBS Crossfire TX modules as well, nothing to worry about.

[@Vogxel]

Is the 250 hz lowband compatable with older 900mhz rx?

[@NeilKagan]

Im excited to try it. But i do have a question. How would you set up X in betaflight ?

[@Akceptor]

Do you actually have to? AFAIK setup in betaflight normally looks like "okay, I have my receiver on UART 2" and that's it. Everything else is in the elrs configurator and lua scripts

[@NeilKagan]

@@Akceptor I always select a preset for the elrs configuration. Normally 250hz.

[@Akceptor]

@@NeilKagan I see. That preset usually just contains settings like if you have SPI or UART receiver, telemetry and RC smoothing. In this case you know it is UART, I don't know if you need RC Smoothing, but you can switch it on and off via toggle. I would probably disable smoothing for tests and just set select a proper port. The whole settings thing is in the different place anyways

[@CapnBry]

You don't do anything in betaflight other than using an appropriate Feed Forward setting for the packet rate-- betaflight just sees channels data coming like it normally does in a single band setup.

[@NeilKagan]

@@Akceptor gotcha. Thanks

[@brianmar8850]

Would it be better to get this one instead of the radio Master Ranger Micro? Is this one still compatible with all the other ELRS receivers?

[@techstuff6829]

Sort of. Main downsides are it’s slightly more expensive and somewhat larger. You also lose some modes when used with single-frequency 2.4GHz receivers.

[@pav2k]

Is the module compatible with my old 2.4 receivers on D500? (one is FLRC another one FSK..?)

[@cinemoriahFPV]

Take my money 💰

[@sUASNews]

So with this we can send MAVLINK as well? Just started watching this.

[@jackvine1348]

On their website they say it is Mavlink ready so I assume so

[@LobstersLobsters]

Sweet now I can outrange my video link by dozens more kms :D

[@jas-FPV]

PleSe ask RM if nano will be fitting x20 radio

[@fordboyzzzz]

just ordered them, what is the best receiver antennas to get for a large glider long range?

[@Michelsen3K]

Lumenier ax2 long range or truerc singularity for example

[@fordboyzzzz]

@@Michelsen3K I just looked the ax2 up the day 5.8ghz - is that compatible with 2.4elrs receiver antenna’s?

[@DizzyBoyTony]

Im getting into FPV just now , I just purchased the TX16s and this module , does anyone know if I need a specific frame that mounts that receiver? Sorry if this is a dumb question .

[@angelnunez6476]

Just put it above fc and extend top plate up if you have to.

[@ДмитроНечай-с9о]

But what does "F" modes mean in Elrs then?

[@techstuff6829]

They use FSK modulation for the radio signal.

[@ДмитроНечай-с9о]

@@techstuff6829 And the practical impact of that?

[@techstuff6829]

@@ДмитроНечай-с9о higher bandwidth, shorter range

[@ДмитроНечай-с9о]

@@techstuff6829 Thank you!

[@breakflight]

Looks interesting, but because of size, on a quad, I'd rather stay with an EP

[@N0FPV]

LoL I just bought a RM ranger module last week 😅

[@Michelsen3K]

Yeah me too. Nano ranger 😂 anyway. 915mhz not legal where i live. I don't want to get in trouble haha 😂

[@quadswithmods]

🎉

[@Jay-zc7iq]

If you had to choose, crossfire or this ……? Help

[@valiant360420]

All those words, and I still am not sure if it will bind to my existing 915 MHz express LRS receivers. 😏

[@techstuff6829]

It will.

[@emafpv]

😊

[@BrainDeadEngineering]

My brain is still healing from the first Gen ELRS drama, not this ! the brain will be cooked for sure now🤣

[@QuinDominicPLim]

These might out perform vtxs.

[@rcaddict9558]

How much do we really need, come on! Isnt normal true diversity enough, lets learn to fly well first! Thanks, this hobby is just draining money now and leaves us wanting every month! ❤

[@fpvfun922]

Overkill.... 😂

[@jaysonrees738]

I swear Radiomaster is in a constant state of "Hold my beer." One company will do something, and then a few months later, Radiomaster comes along with something that invalidates it.

[@jasukenneth]

So it happened. ELRS is now better than Crossfire.

[@JPspinFPV]

Been expecting this kit. At the price its a bargain.

[@FürstKöterich]

Vtx is the Problem mit the Radio

[@Tokyo_Dom]

And I thought managing 2 amtennas was annoying on a quad. Impressive tech indeed, but this doesn't seem really useful for anyone into micros.

[@chuckjoga1161]

I really appreciate the content that you are producing. This is indeed impressive technology and makes me want to move away from Crossfire. However, your opinion on FPV companies producing equipment for war efforts does not seem to extend to the unspoken reason why all the redundancy with Deja vu, gemini, frequency hopping, etc are being developed. These technologies are hardly necessary for your average FPV pilot as I regularly fly miles on the least expensive Crossfire Nano/Tango 2 (1W) combo. But, if I were to be piloting my aircraft in a hostile war environment, this is the RC technology I would be running. It would be interesting to hear your opinion on how war efforts are driving development ad manufacturing of FPV equipment. e.g. 30x30 FC stacks seem to be cheaper than ever........

[@kkazakov]

LoL, wth. I don't fly in hostile environment, but with 250mW my connection sometimes drops. I definitely will be getting this module. Not for war.

[@angelnunez6476]

Lower packet rate to increase range

[@madladdan]

Check that xt30 lol

[@lonelyroamer]

How to get 868mhz version? If I buy LBT version, it’s underpowered right?

[@ChrisQuadFPV]

They gave everyone on KZbin one Free. If you post a video on it 🎉

[@MadRC]

I know right!, I can't believe all I had to do was spend 2+ days testing, recording and editing to get this $45 module. These people will say anything to get free gear.

[@ChrisQuadFPV]

@@MadRC I'd be grateful

[@josefdahari]

Maybe they want everybody to keep it a secret and not explain exactly what it is. That's what they're doing their job explaining exactly what this product is. How dare they

[@ChrisQuadFPV]

@@josefdahari weird

[@woltervandenberg]

Frsky already implemented this three years ago with their Tandem and later the Twin protocol. I don't think it's a coincidence it's called Gemini when FrSky's counterpart is called Twin. I believe the ELRS team stole this idea from Frsky when they got the TWIN-module in their hands for the implementation of ELRS.

[@rubberonasphalt]

ExpressLRS is an open source team, who basically work for free to develop it. Radiomaster is the company selling these modules and receivers, using ExpressLRS. So ExpressLRS must be horrible thieves for stealing something they are not profiting from themselves You also can't steal the idea of redundancy, which has been a concept of radio for decades

[@Vitroid]

🤡

[@Vitroid]

Hopefully just a bad joke... Need an /s or /j in there mate

[@WezleyVarty]

Imagine accusing people of shady behaviour while also supporting a company like FrSky in the same breath 😂😂

[@BengalCatChilli]

Are you high?

[@surjitsinghdeo6533]

So this + OpenIPC mario vtx + fixed wing, would be great for a long range setup ❤

[@hradynarski]

Oo common, dual band :) Ukrainians already have tipple band radios.

[@MadRC]

I hear the CIA has octotupa band radios. Either way this has NOTHING to do with this video bro

[@hradynarski]

@@MadRC It is related, those companies are looking for advancements and are just coping them in their products. And I'm not talking mill grade staff (CIA or DOD).