VAS Crosshair antenna overview
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- Опубліковано 14 гру 2015
- This is the 10dbic Crosshair - A directional long range and obstacle penetration antenna developed specifically for FPV. This is my personal favorite antenna of the units we make.
- Наука та технологія
These antennas are fantastic. I used a 1.3 Crosshair to go 15 miles last week, 800 mW vtx, 1k' altitude, crystal clear video. Thanks for making this hobby better, Alex!
Thanks for bringing these to the Championship, Alex. We wouldn't have good video at the event without you.
I really dig the design, it's damn cool looking
I have the 1.3Ghz version of the crosshair antenna on my antenna tracker and i have to say that the results are quite impressive.
But so far one of the best antennas i used from you was the 2.4Ghz helical 10 turns antenna, what a beast. Too bad today there is too many things on 2.4Ghz, that frequency was my favourite so far...
Happy midweek
Looks sweet! I wanted more penetration and range so I went for a diversity set up with a immersion rc patch. I have not tested it yet, but I am sure I will want more later in the future and this looks awesome!
Hi Alex, thanks for the video it now makes more sense to me. Keep up the good work!! One question for a future video maybe: What is the difference between a cloverleaf, a skew planar wheel, a mad mushroom and and airblade? For which application would I use which one?
Your the best
very cool. 👍👍
Thx Alex for your vids.
I read all comments on this vid and I think it´s time for a comparison / overview of helical, pepperbox and crosshair ;)
My 5.8 pepper a awsome antenna, thx.
+RotorBeast - Done: ua-cam.com/video/88L5Dv-mwQc/v-deo.html
All receiver antennas compared together in one video ;)
Thx Alex
Just a note SEO wise and to boost sales, you should put a link to the products on the website in your Video Description. Saves users having to go to the website and search for it which is not all that easy compared to clicking a link.
Very innovative. However, I just bought the "blue beam" pair (mad mushroom, etc.) so I should be good for a while ... until I start trying to do long range FPV for aerial photography. Cheers.
Hi Alex. My 5.8 LHCP Crosshair is looking a little worse for wear after 2+ yrs use. What would you recommend as a good replacement? The newer Crosshair? I'm only sending my Capi2 about 3 miles at the mo.
Thanks :)
do you really need to use an antenna tracker for this. can't I just turn it with my hand on a tripod?
hi Alex. I have the 5.8 crosshair and I recently notices that the copper tube is loose inside the metal plate on the back. is that supposed to be attached?
It is supposed the be attached but it appears the solder joint released. Does it matter? Not really since the reflector doesn't need to be grounded. However, if you would like it repaired I would be happy to do it for you.
Video Aerial Systems oh ok I'll try soldering it back on. Also when I took the black plastic off. The element inside isn't perpendicular to the coax. Is it supposed to be angled to one side ? Thank you.
I'm building a long range FPV ground vehicle rc. An I'm using 1.3ghz 800mw transmitter along with the omni-directional 5/4 lobe antenna for TX and RCver. Will this be a better option to go with than the pepperbox antenna?
Thanks
For ground FPV, I'd lean toward the pepperbox. The reason being that the wide but flat beam is going to give you a lot more coverage since your elevation changes is minimal.
Do you use Comsol to simulate rf?
Hi Alex, its been a while. Out of interest, for a linear antenna on the plane, would this have any advantage over just a typical rubber ducky linear antenna on the ground? Thanks, Mark
Yes, but you would be best suited with a BiQuad.
@@CAGreve1231 Alright thanks for getting back to me, appreciate it
hey alex, I use the 5.8 helical of yours which works great, how much better is the 5.8 for my goggles better for long range? never knew you had one for my fatsharks, plz tell me about it some more, thanks again......
+MiamiJato - The crosshair is more forgiving when mounted to goggles, but the helical is more versatile. When we fly FPV, our heads naturally look down and drift. The Crosshair's wider beam will help compensate for this. However, I recommend using an RG402 extension cable (RMRC has them) to allow you to swivel it around and aim it better for goggles mounting. The helical is mounted on a cable that can be bent and aimed, but it has a narrower beam. Both have the same ultimate range.
cool, thanks alex.......
Ok this maybe a stupid question, but does it matter what version you buy right hand or left hand? I know the transmitter antenna has to match. I plan on getting the immersionRC 600mw transmitter.
+RCnStuff - The revision doesn't matter. Just be sure the rotation is the same.
+Video Aerial Systems This is causing me a headache. This is my first quad build and I have researched every part that I'm going to buy. There are so many different antennas it's spinning me around in circles. I don't want to buy something and then find out that there 2as a better combination. I did go to your site and read the how to pick an antenna article. I still don't know what one to buy!!! ugg
+RCnStuff - Perhaps this will help? I go over all the types of receiver antennas and explain their benefits: ua-cam.com/video/88L5Dv-mwQc/v-deo.html
I have your VAS pepperbox which in essence is two of these stacked...Am I correct?
+Aero FPV - More or less, yes. the pepperbox is a phased array of two crosshair antennas.
+Alex Greve - Thank you Alex
Question regarding pairing the VAS 5.8ghz Crosshair with your other antenna. Your other antenna come in many cases as a matched set. The crosshair does not as far as I'm aware. If your flying style is mostly what is considered low flying... about 20-50 above tree tops or closer at times. The Crosshair giving good punch through as you state. But you also want the ability to fly high without loss... what would be your pairing recommendation for the 5.8 ghz Crosshair? I'm going with left hand turn though I don't think it matters as long as their both the same turn. Or does it? Or of curiosity, and maybe a stupid question, did right or left show any difference in punch through our reception quality? I wouldn't think they would but then, antenna don't follow my train of thought most times... lol. - tia -chase
+chase In general, it doesn't matter what TX antenna you use so long as it has the same rotation and is of good quality. Beyond that, it doesn't matter. The rotation direction is irrelevant, actually. The only reason to change rotation direction is to eliminate interference between you and other pilots.
+Video Aerial Systems thanks for the reply, in regards to pairing your above Crosshair (on tx) with one of your other antenna for the flying style mentioned previously. Which of your antenna would be best suited? - thanx - chase
+chase - I would go for a Cyclone or a Dura-spec. Either will do very well for you.
+Video Aerial Systems - Thanx for the suggestion. It'll save me from having to make two trips to the local RC Shop.
Alex, I use your 5 turn helical 5G8 on my Fatshark Attitudes. Is this antenna better?
+TheAdkFlyer10 - In some ways, yes. Other ways, no. The helical is going to have better coverage behind and to the sides of the antenna. The crosshair has a wider main beam in the front (115 degrees) and significantly higher F/B ratio which gives you better video through objects like trees.
+Alex Greve Ok thanks Alex!
Alex can you confirm a v3 pepperbox is on the way? and if so how long before UK suppliers get them?
+MrBlackbrabus1 - We started making the V3 at the first of the year. The UK dealers should have it by the end of February.
+Alex Greve that's great, thanks for the quick reply.
For mini quad racing, which is better pepperbox or crosshair?
+zen_808 - I think the pepperbox is better for racing since there are no obstacles you fly behind. However, if you fly a woods course or where there are objects blocking the signal, the Crosshair is the best.
Can it work with Vee antenna on the plane VTX?
+Yariv Milber - Yes, but you would be better off with a BiQuad antenna with a Vee.
What is the maximum range achieved with the cross hair antenna ?
I am looking at a minimum 5 km with consistent video quality.
5km is fairly easy on a Crosshair. I would say 14km is the most you can realistically get from it. If you need more range, look at a black cannon or super cannon helical.
Hi
The data bandwidth that I am sending from the Microhard to the GCS is about 5 Mbps
Would a higher antenan dbi help
With the cross hair, how is the video quality ?
I don't think higher gain is the answer. Usually higher axial ratio solves these things. However, you need CP on both ends for it to work well.
Would be great if you could share any range tests videos with the antenna on drone
How would you compare pepperbox, cross hair and helical in terms of range and video feed quality
What is the significant difference between them
what is the range of the 1.3 cross hair. and pepper?
+coa106 - Range depends on transmit power and noise floor. In good conditions and transmitting at 1 watt, you can get 35 miles out of a Crosshair and 60 miles out of a Pepperbox.
+Video Aerial Systems 60 miles is unreal, do you use solar cells to regenerate power?
so a pepperbox isn't a combination of 2 crosshair antenna's ?
what's the difference ?
+Eric-Jan van den Bogaard - The pepperbox is a phased array of 2 Crosshair antennas. This flattens out the beam and makes it much wider as well as adding 3db of gain.
does this mean that it's hard making them to phase ? once you made the pepperbox, you have to fine-tune, with expensive equipment ?
+Eric-Jan van den Bogaard - Yes of course. The pepperbox is much more difficult to manufacture than a Crosshair.
After talking to someone at the local hobby shop (where btw I just picked up the Mad Mushroom today) I want to ask you the same I asked there. Can I hook up two Crosshairs set up to double the angle? I was told only with a dual receiver that switches between the two. That's not what I mean or want. I want both antenna receiving just angled to double the reception area. it's seems like this is highly doable with a single receiver. You're the pro. Can it be done?
If not, why not? tia - chase
+chase - it can be done in a phased array. I call it the pepperbox ;) Mind you, there is a LOT more to it than just hooking up 2X antennas.
+Video Aerial Systems - Yes, like the Pepper Box. But... skew the crosshair antenna to where the right most receiving angle just overlaps the left most reviving angle of the other. Giving you a wider overall receiving angle. In the case of two of the Crosshair antenna shown in this video that would come to a combined receiving angle of approx 230°.
Without over complicating it, couldn't you just add something inline to correct the combined ohms of the two connected antenna?
ie: You say it can be done. Okay, let's do it! Help me out here, I pick up two Crosshairs and a T SMA connector... what else do I need to complete this project?
I'm excited... this will be one bad ass antenna!
+chase Again there's a lot more to it than just matching impedance. That can be done with a transmission lnie. However, you cannot aim the crosshairs apart and get the coverage you are looking for with a diversity controller. The reason is that the signal from one antenna will fade the other.
+Video Aerial Systems Hmmm... I don't completely understand it due to lack of knowledge on the subject. It certainly doesn't follow logic... but that would explain why I've seen up to 4 crosshair antenna all pointed in the same direction, including the Pepper Box.
What a bubble buster. That's just plain rude of antenna's! Lol.
But... what if you were to curve the crosshair itself slightly? Give it a slight arc, (reverse arc of a dish) just slightly. Say a 5-10° arc. Not enough to weaken the reception in any great way, but enough to broaden the angle of reception. Would that work?
Or phase shift two maybe?
I'm taking stabs at this in the dark I realize. You'd "think" things with antenna would work but apparently they're more finicky than simplicity would make them out to be.
Guess that's why you're considered one of the best at this...
btw - the Mad Mushroom worked great! Hooked it up to my Uno5800 yesterday. Nice! Can't wait to try the Crosshair next!
+chase - You can do a lot by manipulating the phasing and spacing. However, the results are a bit different than you'd expect. If you aim antennas apart, then the components you would expect to add actually divide. This is because the signal will get to each antenna at a slightly different time. You can create a lot of complex figures with multiple phased arrays, but it gets incredibly complicated.
It's correct that the frequency range for a 2,4 Crosshair is only 2400-2460 Mhz (as described on RMRC web page) ?
I really dig the design, it's damn cool looking