Advanced search  


Who's Online
  • Dot Guests: 76
  • Dot Hidden: 0
  • Dot Users: 1
  • Dot Users Online:
* Site Sponsor
* Random Gallery Items

Views: 997
Posted by: munkyboy
in: Pauls Stuff

Views: 2294
Posted by: COKE32
raptor50 (4)

Views: 599
Posted by: mattydred
in: raptor 50
RIP Sky Surfer

Views: 1146
Posted by: ROVguy
in: ROVguys Album
ce s

Views: 823
Posted by: jakegazzard
in: CE OSD
* Latest Gallery Items

Views: 2437
Posted by: Njoro
in: FPV Stuff
Ground Station

Views: 3078
Posted by: Njoro
in: FPV Stuff

Views: 2919
Posted by: Njoro
in: FPV Stuff

Views: 1791
Posted by: Njoro
in: FPV Stuff
zeroG Raptor

Views: 2128
Posted by: Njoro
in: FPV Stuff

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


  • Admin
  • Administrator
  • Marshal of the Royal Air Force
  • *
  • Karma: 314
  • Online Online
  • Posts: 19130
    • My New Blog
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 :) )
Education and schoolin is good, but FPV is gooder :)

My Blog
My Youtube
My Vimeo

English Turbines

  • Air Commodore
  • *
  • Karma: 20
  • Offline Offline
  • Posts: 2284
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.

Nothing beats the smell of Jet-A at 800 Celsius...:)
Falcon UHF & 1280mhz Video.
SW1900 & Storm.

* Recent Topics
Freestyle quad budget build by Coyote
[Today at 06:17:10 PM]

ZOHD Dart XL suffers from iNav logic fail by English Turbines
[Today at 10:14:48 AM]

Testing Frsky R9M antenna orientation. Vertical vs Horizontal by urbanfpv
[Today at 09:45:54 AM]

Laminating film source? by pk-surfing
[Today at 09:09:39 AM]

Mini Talon Testbed by Coyote
[Today at 08:09:47 AM]

Average by Dave
[Yesterday at 02:12:41 PM]

Drone Registration Consultation by electrotor
[Yesterday at 11:41:16 AM]

CTC genuine thermocouple source ? by Coyote
[November 19, 2018, 08:33:59 PM]

3D Printed Trainer by Steve W
[November 19, 2018, 06:41:16 PM]

Nathan's first flights by Coyote
[November 19, 2018, 05:50:45 PM]

* Keywords
fpvhub  fpv hub
first person view video piloting

rc r/c r.c. model aircraft flight pilot fpv piloting wings fly flying flight fuse fuselage aileron tail pan tilt tx rx vtx rtx receiver transmitter video radio control controlled headtracker fpvuk bfpvmfa fpv uk first person view video piloting fpv servo servos easystar easy star multiplex antenna VR1400 fatshark video goggles 2.4 5.8 1.2 900 ghz mhz uhf panel antenna circular fpv polarised tracker dbi 10mw 100mw 500mw camera osd fpvuk bfpvmfa fpv first person view video piloting downlink ezantenna tracker gps EzOSD current sensor tiny telemetry autopilot ccd gopro kx131 kx171 FY21 FY21A FY21AP II IMU oracle diversity processor video switcher fpvuk bfpvmfa fpv uk first person view video piloting insurance simulator delta wing glider funjet quadcropter helis heli helicopter electric nitro scratchbuild scratch build batteries battery 2s 3s 4s lipo lipos fpvuk first person view video piloting Antenna fpvhub  fpv first person view video piloting rc r/c r.c. model aircraft flight pilot fpv Airframe Artifical Horizon Auto pilot Av AWG AWU Bec Brownout Buddy box C rating CG Circular Polarized Data logger Dbi Dbm Dipole Diversity DVR Easycap EPO EPP Failsafe FM Freshnel zone Frequency Gain Ghz Goggles GPS Ground Station Gyro Head Tracker HD Hz Inverted Vee Jst LC Filter Lipo LUX Mah Mhz Omni OSD Pan Patch Platform Polarization Rssi RTH Servo Spotter Telemetry Tilt Tracker Transmitter TVL Ubec UHF Video Splitter Vrx Vtx Watts Yagi  fpv uk first person view video piloting rc r/c r.c. model aircraft flight pilot fpv

http://www.fpvhub.com/forum/index.php?action=sitemap;xml http://www.fpvhub.com/forum/index.php?action=sitemap http://www.fpvhub.com/forum/index.php?action=sitemap;start=0 http://www.fpvhub.com/forum/index.php?action=sitemap;start=100 http://www.fpvhub.com/forum/index.php?action=sitemap;start=200 http://www.fpvhub.com/forum/index.php?action=sitemap;start=300 http://www.fpvhub.com/forum/index.php?action=sitemap;start=400 http://www.fpvhub.com/forum/index.php?action=sitemap;start=500 http://www.fpvhub.com/forum/index.php?action=sitemap;start=600 http://www.fpvhub.com/forum/index.php?action=sitemap;start=700 http://www.fpvhub.com/forum/index.php?action=sitemap;start=800 http://www.fpvhub.com/forum/index.php?action=sitemap;start=900 http://www.fpvhub.com/forum/index.php?action=sitemap;start=1000 http://www.fpvhub.com/forum/index.php?action=sitemap;start=1100 http://www.fpvhub.com/forum/index.php?action=sitemap;start=1200
* Disclaimer
The content, views and opinions expressed within this forum are those of the authors and do not necessarily reflect the views, official policy or position of FpvHub. However, we reserve the right to remove or edit any content considered inappropriate.