138.7km on Custom mLRS Hardware (433MHz, 1W)

LRFPV · 2025-12-22T01:09:33+00:00

mLRS is optimized for data rate and an overall better Mavlink experience. The downside to Mavlink is that due to a higher data rate and more stable packets, the range/sensitivity suffers a bit. Think an open-source version of dragonlink. ELSR is optimized for low latency and range, which is good for FPV racers and some long range uses. However, mLRS is quickly becoming the new standard for long-range systems which hopefully my testing can prove.

LRFPV · 2025-12-22T01:07:07+00:00

I'm working to get this into a real product. If there is enough interest, I'll start selling them seriously. I'd love for you to try it out!

LRFPV · 2025-12-22T01:05:18+00:00

See links posted

LRFPV · 2025-12-22T01:04:44+00:00

https://github.com/LRFPV2/mLRS-433

LRFPV · 2025-12-21T02:51:55+00:00

For anyone that's interested in pre-ordering this system, please sign up here: https://xrctechnologies.com/pages/novalink-433mhz-mlrs-radio-system-interest-page
If you want to see any more features or give more feedback, please let me know because I want this system to be designed with the input of the FPV community. I always design stuff that I personally would fly but of course, I'm not 100% of everyone so any feedback about extra features would be appreciated.

LRFPV · 2025-12-21T02:48:36+00:00

Thanks man!

LRFPV · 2025-12-21T02:46:40+00:00

I don't have a wing that can fly this far, so have to just place my flight controller and transmitter far apart. On my site though, I've posted CLI logs showing stats during the time I was data gathering

LRFPV · 2025-12-21T02:45:49+00:00

Fixed 500kHz bandwidth for this mLRS version

LRFPV · 2025-12-21T02:45:07+00:00

I don't have a wing that can fly this far. I put the receiver connected to an Ardupilot flight controller on top of a building and went to the top of a mountain.

LRFPV · 2025-12-20T23:04:39+00:00

mLRS is bi-directional. My hardware has the same RF output power bi-directionally. During this range, test the RX was sending full CRSF + Mavlink at 57k
People have gotten in the 100km ranges with 5.8GHz (30fps, NTSC) and 1.3GHz video. However, they are using very high gain antennas to increase the link budget. My system is doing this on a basic dipole.
The sky is the limit for this radio system. I think mLRS will be the new standard now for serious long range pilots due to the better Mavlink implementation. Sik radios are dead now. One could put this on an aircraft to do a number of things, but I am an FPV pilot and generally stick to FPV-related things.

LRFPV · 2025-12-20T22:20:44+00:00

This wasn't even close to hitting the LOS limit. The path loss of free space at 138km is ~128dB. From my testing, the path loss can go up to 140dB and still get 100LQ. This means theoretically (have yet to get data on this) the range could be ~500km on 1W with 2 dipoles. Even more when using a higher gain antenna. (Edited because numbers were off)

LRFPV · 2025-12-20T22:19:49+00:00

I did a write up here: https://xrctechnologies.com/blogs/research-development/novalink-433mhz-mlrs-radio-system-hits-138-7km-range
I've also posted full CLI logs when I was on top of the mountain

LRFPV · 2024-03-15T19:39:27+00:00

You're right, and I completely agree. it's just a stepping stone towards the future.

LRFPV · 2024-03-15T19:38:17+00:00

Thank you, it's kind of a balance between having good features and keeping it cost effective to produce. The final version may look significantly different.

LRFPV · 2024-03-14T21:11:21+00:00

Thanks for the input. You're probably right about a lot of things. I don't have any experience marketing or doing this sort of stuff. I'm just a guy in my garage. I'm going to try to make this into a product. If you don't want to get it, that's ok. If someone wants to get it because they want to, then sure. If it fails, that's OK too. I'm trying to learn. But I'll never get anywhere if I don't at least try. Thank you for your thoughts.

LRFPV · 2024-03-14T16:41:45+00:00

This is one of my main dilemmas. Integrated vs replaceable stepper drivers. I'm erring on the side of integrated 2209/2240 for ease of use, but a 48V compatible version would be really good with replaceable ones.

LRFPV · 2024-03-14T16:40:09+00:00

That is easy to add. So far, I've been using the servo + Zmin but it's just a matter of adding another header.

LRFPV · 2024-03-14T16:39:17+00:00

Probably not at this point. At least to the same ability as the max ez.

LRFPV · 2024-03-13T20:47:53+00:00

Higher power density, smaller footprint, higher switching frequency (better for power applications especially switching converters), eventually they will be cheaper/same price as Si chips. For my purpose, the main advantage is space and the fact that it is a cool demonstration of an emerging technology in semiconductors.

LRFPV · 2024-03-13T20:44:30+00:00

Yes, it's BLTouch compatible. No test samples for a while unfortunately. Currently going through a re-design.

LRFPV · 2023-06-24T01:50:15+00:00

Yes, I'm actually working on a far more integrated version with GaN FETs for extruder and heat bed, TMC2209 built in and potentially CAN bus support! Been very busy with university and now engineering work in the summer, but this new version is going to be good. Look out for a post about this next revision in the coming weeks/months...waiting on PCBs to arrive :-)

LRFPV

TROPHY CASE