When I put a Lumenier Micro on my TH2 Freestyle, I extended the wire as to go for the "long range" look. It extends just a bit above the battery, and has a very clear shot. It's kicked back at maybe a 15 degree angle. I think it looks sweet!

I never tried it without the extension, as it wasn't long enough to fit the way I wanted. My range, reception, and picture is considerably better. It is a solder connection on the VTX. I also put a patch and an omni on my goggles at the same time, also Lumenier products.

I'm wondering, at what point is an extension wire -too long-? I'm not an electricianologist, but I imagine resistance plays a factor.

Reason I'm asking, I'm about to get an LR quad, and kinda desperate for a LHCP antenna till I can find the one I want, in stock. I've got a few bucks in my goggles antennas, I don't plan on switching to RHCP

Could I add, say 4-5 inches to a Micro AXII, just to get by? How long is too long?

Thanks again!

Not all extensions are made the same. I remember Joshua Bardwell tested a few pigtail and realized this issue. So there is no clear answer. You going to have to individually test whatever extension you are planning to use.

(31-Mar-2021, 06:05 AM)voodoo614 Wrote: Not all extensions are made the same. I remember Joshua Bardwell tested a few pigtail and realized this issue. So there is no clear answer. You going to have to individually test whatever extension you are planning to use.

I just took and cut up a regular 5.8 whisker antenna, and soldered the Micro to it. The SMA connectors are -super- easy to desolder. I waved it in front of my propane torch, and it slid right apart. Short of just doing it and see if it works, how would I go about testing it? I imagine with the SWR meter I don't have? lol

You will need a vector network analyzer.

I don't see that my normal suppliers (RDQ or GetFPV) carry a Ufl to Ufl extension cable.

Is there a reliable source for those, preferably in the US?

EDIT+ They don't deal with quadcopters, but, looks like a few options, with different lengths and insulation qualities?

https://www.data-alliance.net/u-fl-exten...n-10-inch/

Or, would it be better to just cut and solder an extension, than use adapters? That would make sense to me, less resistance, and no chance of it coming unplugged. True statement?

I personally just use a U. Fl to SMA extension. But I don't fly a lot of micros, so this can be an issue with weight on smaller quads.

as for your question, what is better. I honestly don't know. But a direct solder makes more sense that it would be better.

How much more height do you need on a TH2?

Connectors and wire are both going to contribute to signal loss, especially at 5.8GHz. Connectors are particularly lossy, so it's best to avoid extension cables if you can. The loss from a few more cm of coax is likely negligible, especially if it means getting the antenna up high above the battery giving it a clear LOS to the receiver. If you're not flying long range it isn't critical though. You'd be better served with a quality VTX and RX and decent antennas on your goggles.

(31-Mar-2021, 08:30 PM)V-22 Wrote: How much more height do you need on a TH2?

Connectors and wire are both going to contribute to signal loss, especially at 5.8GHz. Connectors are particularly lossy, so it's best to avoid extension cables if you can. The loss from a few more cm of coax is likely negligible, especially if it means getting the antenna up high above the battery giving it a clear LOS to the receiver. If you're not flying long range it isn't critical though. You'd be better served with a quality VTX and RX and decent antennas on your goggles.

This is regarding a Diatone Roma F4 PNP, that has a RHCP stock, that I need to switch to LHCP.

I haven't bought it, yet, I'm trying to do all my research first. I'm kinda ocd like that lol

I've got a Lumenier AXII Duo patch, and the Double AXII omni, and I'm very happy with them. Both, obviously LHCP.

Edit- would a Lumenier Double AXII omni be absolutely..ridiculous?! Maybe? OK, yes, it would, but I think it would look sick! ?