A simple DIY collinear antenna for 2.4

[Kondor-FPV]

I have been wanting to try some simple collinear antennas for a while now.
The gain is supposed to be between 5.8-6db.

It's quite simple to construct.
measure 60mm from feed point to the first loop, than measure 90mm from the bottom of the first loop and make a second loop in the same direction as the first one, than leave 83mm for the top section.

If you do this the best swr you'll get is 1.4 to 1.5.

If you want better SWR, cut a 1/4 wavelength section of wire (slightly abundant) and solder either on the sma connector or directly on the outer braided sock of the feed line, approx about half wavelenth south of the feed point.
Than with a swr meter bend the "pseudo-radial" down some 20° until you hit 1.1 SWR.

These are the antennas.

[SENTRY]

moved to "DIY"

[Kondor-FPV]

moved to "DIY"

Thanks,
next time I will put the new antennas build instructions on here.

[msev]

Is this an omni? What's its radiation pattern, does it have that big null that higher gain omni's usually have?

[Kondor-FPV]

Is this an omni? What's its radiation pattern, does it have that big null that higher gain omni's usually have?

Of course it does, an antenna with no gain (isotropic) would have perfect spheric coverage.

High gain antennas are only for long range flying, with slow turns , shallow bank angles, the further you go the better they work.

They are not for close in flying and hot-dog flying.
That's why standard whips (tuned ones) at 2.15db will do better when within 3km.
Cloverleafs will do even better at 1.2db gain for close-in hot dog flying.

These antennas if tuned properly will have potentially more than twice the range of CL and a good 60% more range than a standard whip.

A 9db coax collinear (COCO antenna) for UHF 433mhz is also in the works.

[FPV FLYER]

Super sexy! I can't wait for a 433, is that going to be kinda big?

[Kondor-FPV]

Super sexy! I can't wait for a 433, is that going to be kinda big?

Yes, a 433 antenna of this kind would be equivalent to a sg7500 with 6db of gain, and it would be a tad less than 500mm in length.

Definitely a tx antenna on the ground rather than a rx antenna on the model.

[FPV FLYER]

Definitely a tx antenna on the ground rather than a rx antenna on the model.

Yup