Yagi range extenders
- Thread starter OldGuy
- Start date
cgmaxed
Well-Known Member
I like the idea, not to use the word "Range" or "Extender. For some, it gives the impression a person wants to fly further when that is not necessarily the case. Most of us want a more stable signal to control the drone. It's disconcerting when the signal gets fuzzy and the video feed gets blurry.
Yagi's are designed for specific narrow band frequencies. It will always work best at the design frequency.
They are technically end-fire traveling wave antennas with some fairly critical dimensions.
Summary - best used at design frequency and it will probably degrade signal at any other.The reason they picked 5.8 is because the dimensions are small enough for mounting directly. The dimensions would have to be roughly doubled for 2.4 Ghz. Unfortunately 5.8 being a shorter wave attenuates faster (trees etc) and has less reflectivity (nearby buildings and such). But then there's usually less interference.
My favorite is still a BiQuad antenna which you can build yourself
But isn't it true that 5 GHz is for shorter distance, especially around home WiFi? 2.4 GHz goes much further, so wondering if the yagi is useful at all. If it worked on 2.4 GHz they'd really extend. Am I reasoning right?
Yup. That's why in engineering land we use the term "gain", which encompasses amplification, signal concentration, directionality, etc.
Amplifiers have gain, antenna designs have a gain factor, etc. It all results in the same -- a stronger signal to process -- hence you can compare the "help" of a particular (directional) antenna design to an amplifer.
Another way to visualize it.
A wide river flows more slowly than when it funnels into a narrow area. Same rate of water, but more spread out in the wide section, and more concentrated in the narrow section.
A wide river flows more slowly than when it funnels into a narrow area. Same rate of water, but more spread out in the wide section, and more concentrated in the narrow section.
And that is the norm for all of these range test postings? No. Also, FR24 apparently has some lag and will only show aircraft fitted with transponders. At four miles out, you can see what and who you are flying over? Like I said, in the desert (or everglades ?), no real problem.
The length of those little perpendicular nubs is related to the frequency... 2.4Ghz yagi they're about 4x as long. A dual-band design would be much more physically complex, expensive, and probably wouldn't sell at all when you can just use 5.8Ghz alone.
Although 5.8Ghz is more prone to obstacle attenuation, there are more channels and less crowded. Wireless doodads tend to only support 2.4Ghz so far.
bought one from amazon on sunday and was delivered today and had a quick go with it, previously i was getting max 700m and weak signal and drone would return home, same trip but i forgot to actually just choose 5.8ghz so it was set to auto dont know if it matters or not? but i got to 1250m before weak signal and drone returned home, so that was a good £12 spend i would say. must add that this was very urban test middle of an housing estate.
You should set transmission to 5.8GHz in DJI Fly when you use the 5.8GHz yagi extender.
However, simply having it attached will make 5.8GHz work better (stronger, less noise) than 2.4GHz, so even in auto mode the RC is likely to operate entirely in 5.8GHz when you get more than a few hundred feet away and are pointing the antenna at the aircraft (thereby realizing the gain from the Yagi).
There's somebody in the UK who makes and sells parabolic and yagi-uda's. Don't remember name, but has a you tube site.
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