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Author Topic: Modifying Frsky R9 antennas  (Read 176 times)

Coyote

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Modifying Frsky R9 antennas
« on: October 30, 2018, 06:37:19 PM »

Hi guys

Out the box the Frsky R9MM antennas and most the other receiver antennas are really poor. There are lots of arguments over the antennas lengths but really fractions of a mm or a mm or so aren't going to half your range the antenna being fractions out will only reduce the maximum potential range.

So with that said what's all the problems with them then ?

Well the main problem is the way the user is installing them, totally incorrectly on the likes of a mini quad rendering the antenna pretty useless against the carbon. Others are putting them alongside signal blocking lipos etc.

The other main issue with them is the position they are in when they are installed, the antennas are Dipoles so should be installed at 90 degrees to the feed point and inline with each other. They do not come like that though so this is where a lot of issues are coming about.

If you have a 3D printer handy, or at least someone with one that has 6 mins to spare here is the easiest way of fixing them :) This technique can also be used with other frequency antennas and not just limited to 868MHz

First what do we need ?

  • Snips
  • RC antenna tube
  • Heat shrink Tubing
  • Soldering Iron
  • Printed Immortal T copy



Cut the antenna tubes to length so they cover both elements and a portion of the feed wire.

Then desolder the black wire to enable you to push the antenna tube over the whole antenna to the rear.



Solder the black wire back on again as close to the split point as possible.



Put the other two tubes over the elements and cover the inner ends in UHU Por and leave to go tacky.



Then apply UHU Por to the printed T parts and again leave to go tacky.

Once tacky lay the tubes inside and bring together the two T parts, the Por will now hold the antenna together. Cut the heat shrink to the required length and slip over the antenna tubes, heat and they will hold the antenna together while the glue dries and trim the antenna off nicely.

I uncoupled the UFL connector on mine and slipped a piece over the feen end to neaten that bit up as well.



Done !

Your antenna is now in its must optimal configuration and is easier to install ( Properly positioned :) )
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English Turbines

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Re: Modifying Frsky R9 antennas
« Reply #1 on: October 30, 2018, 06:56:31 PM »

Nice job Ian...

                       Does Trappy know you have stolen his "Immortal Tee" antenna..?

                        AKA a Dipole....lol.

  That 868mhz Moxon for the TX should be epic with this.

                                                                                    :vulture:         
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