Interference testing RHCP VS LHCP
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- Опубліковано 29 вер 2014
- In this video MASHTON and IBCRAZY investigate the theory that mixing RHCP and LHCP allows greater channel separation. Our findings were that separation advantage is directly proportional to axial ratio.
More testing will follow of course. We intend to try this on 5.8GHz as well. - Наука та технологія
Great vid as always!
It's pretty interesting, it seems you are safe if you don't go further a certain distance according to the antenna powered up on the other video transmitter! I need to learn more about RHCP & LHCP :)
Thanks for sharing
Excellent video
Thank you Alex you da man!
Hi Guys! Im a beginner and I biught 2 triumpnantenas which are rhcp and a menace patch antenna which lhcp. My question os that I jave to buy a new patch antenna which rhcp like the other triumphs antenna? What do you suggest? Thx the answer in advanced!
Would like to share this in this weeks RCTV-UK Round up and news Alex, congratulations on this successful innovation.
ATB Malc
Feel free to share. This is more about the testing and data more than me releasing a new antenna design.
Great stuff guys. Will be fun to start flying on this mix of new gear. Love the landing Alex. :)
Nice.... its a long shot but any direction on where to get a Vswr meter on the cheep been building antennas for a while and want to perfect the swr to get the best results.. all the best and keep up the amazing work you are an inspiration, cheers Mat . UK, team Ham FPV
Matthew Hewitt
- I have two threads (on FPVLAB and RCGroups) about how to make an SWR meter on the cheap called a DIY SWR meter.
+StoneBlueAirlines Is the cyclone better then the mad mushroom ? is it avaliable for purchase yet?
+RockHeroBand - Not out yet. Still working on it... These designs take time. I have been working on it for 2 years now. I almost have it where I want it.
Alex Greve Please let me know asap when its out, i'd love to test it out!
I'm running 1280 and 1258 on my multicopter - probably 18" separation between transmitters and antennas (two-person aerial videography rig). Both are using mad mushrooms - ground station is combination cross-hair and mushrooms with Eagle Eye diversity. I've not had many issues flying to 2~3km out. Am I limiting my range overall though because I'm running 1280 and 1258 - or because they're transmitting from the same multicopter, do I just see fewer issues? The problem I see using LHCP is that transmitter would be limited since I don't have an LHCP cross-hair. Maybe I should consider moving one transmitter to 2.4 (with a low-pass on the 1.3)?
Damn good job!
Great results. I'm looking forward to the 5.8 testing since there are more channels. We've been able to fly on 5.8 Fatshark with three channels 3,5,7. All right hand. We just don't allow close fly overs since we are all standing pretty close together and get ghosting. For landing/powering up we walk out to the field when others are flying. We tried channels 1,3,5,7 on the ground but had issues. I have a feeling had we flown them out there it would have worked. One person had a repeater on their ground station and I think that's what messed the others up since it was so close.
PS...I'm on my third set of Blue Beam Ultras. This last set uses the SMA adapter for a different receiver. Everything is working great. Very happy with all three sets! Even the one that I crashed pretty good on the mini quad is still performing well. Thanks for a great product!
Your avoiding the ultimate product you can invent! 7-9ghz vtx and vrx for HD. :o) great testing and design work guys ,
Was those tests using the channels furthest apart? Or close together for testing purposes?
Only the two legal U.S. channels were tested: 1280 and 1258MHz. We will do some 5.8GHz testing in the coming weeks.
Test channels were the only 2 channels legal on the 1.2/1.3 band in the USA. 1258MHz and 1280MHz. We plan to do this on 2.4GHz and 5.8GHz as well. That will allow for closer channels to be tested, but I think we will see similar results with closer channels.
MASHTON1138 Alex Greve Do you think using the furthest channels apart on the 5.8GHz with one person using using LHCP and the other using RHCP would be okay?
Kit Barlow Yes
Kit Barlow
It should help to use farther apart channels rather than adjecent ones. However I have no experience trying so I con only speculate.
How about a demo of both on the same exact channel? I wonder how that would work?
Check at 11:00. We tried that.
Ok. Just you didnt mention that you were going to use the same channel. If the rejection is enough that you can get that far on the same channel then in reality you could fly 2 planes comfortably
That test didn't make it into the final version. At 11 minutes I am not on the same channel. When I flipped to the same channel Alex was using we completely lost his feed. I can't say this enough, Do not fly on the same channel even with LHCP v RHCP.
Thanks for the feedback Mark. I see the biggest advantage for flying miniquads with my mates as sone of tgeir channels walk all over mine
Would love to see the same test but inside a building like a big warehouse and another one around trees so we can see what it would be like when flying multiple multi copters on the same 1.3 or 5.8 band.
Good suggestion. I will see if Marc wants to try 2 vehicles in the air with objects and such to dive behind.
Alex Greve You have to ask?????
MASHTON1138 Haha
Any chance of seeing a 5.8ghz comparison between your antennas and people flying with other ones such as the SpiroNet V2?
Andrew McClenaghan Alex lets do that video I have some gear in from Immersion just waiting for us maybe at the fly in do some testing would be a great place to do it what do you think. Do you have some of the circular wireless we can use also?
So, if you did this on 2 planes moving around, you would have practically no problems?
Yes, that is what the testing indicates. We will be putting it to more practical use very soon with 2 or more planes in the air. But we are convinced this is the case as long as you don't crash or land right at the other pilot's GS while he is out at range.
I wouldn't say "practically zero issues". You still need to be mindful of the other pilot and you cannot go for distance unless the other pilot does the same at the same time. Separation is ~8-10db greater. Not a miracle cure but certainly an improvement.
That makes sense. Pretty cool
🤩
Giv the guy another toss 👍
if you are flying with some one on the same band their plane would be out there with yours not standing 20 feet away from your ground station ????? so again you would end up with less interference from each other. if one of the systems was on 1160mhz and the other on 1280mhz you would have more channel desperation. we can all see that 1258 and 1280 are still to close. you need 80mhz separation. even with left and right hand CP antenna's. to bad that's not legal? Whatever