Sander-style (Ez)UHF antennas

[Freshmint]

what RF test setup are you using?

[Sgt. Schultz]

Is 164mm the Optimal (norm) setup for these EzUHF rx's?
(I see others are making 143mm?).

The correct length is 164mm because that will yield the best overall results across various materials used in construction.

Well, YMMV, I've built quite a few of these and it matters what nyrod/pvc tubing you use for the antennas. Initially I used antenna tubes used for RC cars, those resulted in the 164mm length, then I started using PVC pushrod sheeting left over from Multiplex kits (Ez, etc.) which resulted in 153mm length. Now I'm using nyrod, as that's pretty much available the world over and that results in 143mm. So unless you have a spectrum analyzer with VSWR bridge you won't get it exactly spot on, but in most cases 143mm will be close enough. The reason for the differences is because the plastic tubing acts as a dielectric and it changes the resonance frequency of the antenna. If you want to get the best performance I would build one with 180mm length and connect to the EzUHF (disconnect the other antenna) set things up in a fixed position at the field and clip away with a cutter (per mm) untill RSSI reads highest, that'll then be the optimum for the materials you used.

The 164mm work great with the DU-BRO Antenna Tube

[Scotttu]

These are dubro antenna tubes and 164mm but the beauty of 164mm is that it is larger than 143mm so if one wanted a 143mm they could simply snip it to that point...But the math says 164mm

[hugy]

Tim there is a confusion in your guide. You say the correct length is 164mm but underneath fig4. you mention 143mm as the correct length.

[Sgt. Schultz]

Tim there is a confusion in your guide. You say the correct length is 164mm but underneath fig4. you mention 143mm as the correct length.

http://fpvlab.com/forums/showthread....ll=1#post46340

[hugy]

Yeah I know it should be 164mm but in the guide he says 2 different things.

[Sgt. Schultz]

Yeah I know it should be 164mm but in the guide he says 2 different things.

Me too.
http://fpvlab.com/forums/showthread....ll=1#post46337

Maybe you can get him to change the guide.

[ssassen]

No I don't, I only mention 164mm, which is the correct length. Please point out in the below post where you find 143mm and I'll edit it out.

http://fpvlab.com/forums/showthread....ull=1#post3721

[FinalFrag]

Not in the first page, but here is still a reference to the 143mm

http://fpvlab.com/forums/showthread.php?382-Sander-style-(Ez)UHF-antennas&p=5977&viewfull=1#post5977

[timnilson]

Tim there is a confusion in your guide. You say the correct length is 164mm but underneath fig4. you mention 143mm as the correct length.

Just fixed this now. Sorry for the confusion. 164mm is the correct length.

http://www.fpvmanuals.com/2011/03/23...nd-turn-style/