Antenna cross polarization loss demonstration

This is a quick video demonstrating cross polarization loss with linear and circular antennas. Marc (FPV Goose) came up with this test set up to measure element orientation after the antenna covers were installed and it really shows how well the system works.

[adamk.]

I love these type of videos Alex, can you make more educational videos on antennas and all the mysteries of how they work?

[camaro]

And that's why I put my linear antenna on a gimbal with it's video transmitter. Now it's always straight up and down.

[joeddejohn]

Nice video Alex. Thank you for the demonstration.

[clayhuff]

You have some good videos. I am an EMC engineer so naturally want to nitpick some of the things you are doing with the analyzer. Overall though I really like your show.

[ToniVucic]

What's the antenna to the right? He said "linearly polarized hd dipole" I think? But I can't find something named like that online. Looks like a sleeve dipole maybe?

[thenatedog]

I gotta question about fpv on water. Fpv boat specifically. What are your thoughts on best frequencies and antenna's for control and fpv on water where you have a fixed height but want to get some range?

[MrHugomiguelcandeias]

thank you very much ....it helped me a lot understanding about polarization.

[stringwhisperers]

Is there any reason for not running a circularly polarized antenna on a rc transmitter all the time besides size and fragility?It looks like it is a no-brainer but i have never seen anybody doing it other than you.

[shawnzfpv]

So if you have a linear on the TX side, you either need to fly upright all the time, or use a circular on the RX side and get lesser signal loss when off angle? This would explain why the dipole TX antenna has been working so much better than expected with circular on the goggle / RX side.

Is there any advantage to Left vs Right circular on the RX side if the TX is Linear? I've been running LHCP just figuring it would better reject the RHCP signals that most of the other pilots are transmitting with. The reality is I don't notice a significant difference. The omni is a Mad Mushroom on the RCHP setup and an Airblade on the LHCP setup.

[icp-trek]

So when will you test a model reciever with a CP antenna? I would assume that the rssi wouldn't fluctuate as much with it.

[oldradiotransmission]

hi Alex, great vid explanation as usual, may I know what VNA is that? is it FieldFox agilent as you used before?

[JaraFPV]

IBCrazy, what about in the other hypetrain where you use linear antenna (they call it snowman) for their VTx and use CP antenna for their VRx?

[BlackPixxelDE]

Hi, I was wondering how the antenna would still be able to receive anything when tx is vertical and rx is horizontal. The electrons of the receiver would only move up and down, but not left and right. So they would not create a current.

[K_BlaZer]

great video Alex. Do you have any solutions to replace a linear antenna with an omnidirectional? I just got a baby hawk and it's a ton of fun. But I would like a better antenna on it. I can solder really well if I have to solder on an antenna myself

[AdaptFPV]

If I'm running diversity. Should I use two linear or one linear and one circular.

[JulianGoesPro]

what about running a dipol vertically... wouldn't that be cool... I mean the left right bank would still hurt but with quads that leaning forward for speed that would be a big win since the "how much tilt will I be at most of the time" question would be irrelevant, right? :)

[paulvallejo]

This gets more confusing by the day. If you had to choose only one type/model of antenna to fly around a wooded area, what would it be?

[piman]

What about Connex and MIMO? Would you recommend the linear or CP version of your panel antenna for racing? The digital signal also benefits from multi pathing, so that complicates things even more.

[twinturbostang]

Is this effect reduced for lower frequencies? Like 1280 MHz?

[krssnoop]

CP antenna for the crossfire? would it be too big?