Michael Ratcliffe
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  • South Australia
  • Australia
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Michael Ratcliffe's Discussions

RTL engages when trying to disarm

Started this discussion. Last reply by Joakim M Nov 4, 2012. 2 Replies

HiSo today when I went to disarm my apm 2.5 it entered RTL mode and my quad suddenly took off. I had control of roll and pitch but not throttle. The quad shot up about 30 metres. After fighting with…Continue

Range Problem with 433Mhz Radio

Started this discussion. Last reply by Jan Jun 12, 2013. 30 Replies

Hi All,Has anyone experienced range problems with the 433Mhz 3DR radio?  I get a solid initial connection but I can only get about a metre of distance before the signal drops out. I also have a…Continue

 

Michael Ratcliffe's Page

Latest Activity

Michael Ratcliffe commented on Ilya R.'s blog post iQuad - Tilt Rotor Quadcopter
"Hey, looks good. Just wondering what you used for the bearings? Did you make the housings for them or did you get them from somewhere? "
Aug 2, 2013
Jan replied to Michael Ratcliffe's discussion Range Problem with 433Mhz Radio
"I once bougt these for another project. They do fine. However the frequency range of these antennas is from 429 to 436MHz.The radio modules work in a range of 414 to 454 so they are not ideal as you risk to get out of band.This is something I still…"
Jun 12, 2013
Jan replied to Michael Ratcliffe's discussion Range Problem with 433Mhz Radio
"Not yet but I already left a bad review on their site"
Jun 12, 2013
hp cre replied to Michael Ratcliffe's discussion Range Problem with 433Mhz Radio
"I have the same problem exactly with RCtimer radios. Where did you guys buy the replacement antennae ? i don't want to make the same mistake twice !"
Jun 11, 2013

Moderator
Sgt Ric replied to Michael Ratcliffe's discussion Range Problem with 433Mhz Radio
"Have you contacted RcTimer about their bad antennae?    "
Jun 6, 2013
Jan replied to Michael Ratcliffe's discussion Range Problem with 433Mhz Radio
"Hi, I'm having the same problems with the RcTimer 433 modules.Guess what, bad antennas.Thanks to the info of Andrew Tridgell I nailed it down.By replacing the antenna all was working fine.So Andrew, thank you for the troubleshooting guide!"
Jun 6, 2013
Kenn Sebesta replied to Michael Ratcliffe's discussion Range Problem with 433Mhz Radio
"@Andreas Baumgartner Good find, those are indeed 2.4GHz antennas. Specifically, they're called coaxial dipoles, which are used because they're cheap to manufacture and easy to connect to*. In the classical approach, the shield is pulled…"
May 31, 2013
Andreas Baumgartner replied to Michael Ratcliffe's discussion Range Problem with 433Mhz Radio
"Hi,   I bought two antennas from RCT (433 MHz Set) but I think they are cheap 2,4 GHz antennas. I have made a X-ray og them together wit an original 2,4 GHz antenna   "
Feb 9, 2013
Byron replied to Michael Ratcliffe's discussion Range Problem with 433Mhz Radio
"Here is a 2km mission using a new 2dB antenna on the plane and a high gain on the GCS (field test logs attached). No more loss of signal with the new antennas so I'm quite pleased with the results. "
Feb 9, 2013
Faraz Ahmad replied to Michael Ratcliffe's discussion Range Problem with 433Mhz Radio
"@ Byron, i am getting similar values with 433mhz telemetry module.realy looking forward for your field test results. thanks"
Feb 6, 2013
Byron replied to Michael Ratcliffe's discussion Range Problem with 433Mhz Radio
"I have since replaced the original 433mhz antennas and now get about 195 when doing the 1m test. Using the original RCTimer antennas I got about 120... I will be doing some field tests this weekend using the following antennas and will post my…"
Feb 6, 2013
Nick Roosen replied to Michael Ratcliffe's discussion Range Problem with 433Mhz Radio
"I've had the same issues with my 433mHz 3DR radios from the start. I'm not sure what's going on. I've done all the tests suggested in this thread and come up with a similar result as Michael. When I set my Tx power to 20dB and…"
Feb 6, 2013
Hugues replied to Michael Ratcliffe's discussion Range Problem with 433Mhz Radio
"Hello, Are you sure your antenna is not broken ? Would explain the 1 m distance"
Feb 5, 2013
Eladio Garcia replied to Michael Ratcliffe's discussion Range Problem with 433Mhz Radio
"Hi,Regarding to Byron questions, I replaced the antenna and all works fine since then, with successfull field tests. No problem of connections neither loss of signal (at close - medium range, of course - I only have tested as far as 2 km from GCS ).…"
Feb 2, 2013
Byron replied to Michael Ratcliffe's discussion Range Problem with 433Mhz Radio
"Hi Eladio, I seem to be having the same issue as you had. Have you replaced the antenna? And have you had any successful field tests?   thanks"
Feb 2, 2013
Eladio Garcia replied to Michael Ratcliffe's discussion Range Problem with 433Mhz Radio
"Hi Tridge, You are right: I have a bad antenna. I already had tested all solders in both modules and all were fine. But now I have touched with a screwdriver the antena pin of local module and RSSI values (both locale and remote) rose to 194! No…"
Dec 10, 2012

Profile Information

About Me:
I am a Mechanical and Mechatronic Engineering student in my final year.
Please tell us a bit about your UAV interest
I am interested in UAVs due to their unique dynamics and the extra challenge they pose when developing autonomous control through vision system.
Hometown:
Adelaide

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