john
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  • Gainesville, FL
  • United States
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john's Discussions

Any genuine 3dr radios with Ftdi chip?

Started this discussion. Last reply by Troy Daigrepont Jan 23. 1 Reply

I bought a chinese clone radio and it had a different usb chip that wouldnt work with my smartphone drivers. So i am trying to find a genuine 3dr usb telemetry module or one with a genuine Ftdi chip.…Continue

Is it possible to add a 5 watt RF amplifier to a 3DR/Hope radio module?

Started this discussion. Last reply by john Dec 28, 2015. 14 Replies

I have upgraded to a 1 watt radio, but even with good dipole antennas I am only getting around 800 meters through trees and buildings (much more when up in the air of course). Better antennas may…Continue

Can 3DR radios be used to build a gps tracker?

Started this discussion. Last reply by john Nov 7, 2014. 2 Replies

I have a few Mediatek gps modules that I am not using and I would like to build a small gps tracker (not to use on a UAV but something else). The gps trackers that use radios like Garmin dog trackers…Continue

Crash when ground station signal was lost and using joystick

Started this discussion. Last reply by Ben Mar 9, 2016. 4 Replies

I was flying Arducopter 3.2 today with the ground station telemetry failsafe parameter enabled and set to RTL. It was hovering stably on guided mode and using a usb joystick when my ground station…Continue

 

john's Page

Latest Activity

john replied to S. Osborne's discussion English channel with (off the shelf, gutted) boat on autopilot.
"I would guess that he would drive over there and pick it up right when it comes ashore since it might get stolen. Especially if it is a big boat."
Sep 9
john replied to S. Osborne's discussion English channel with (off the shelf, gutted) boat on autopilot.
"Hi Mitch, Sorry for the late reply. I don't have any experience with autonomous submarines, but always been fascinated by the idea. You could try searching the internet. If you could get the buoyancy just right it might sit just below the…"
Sep 8
john replied to S. Osborne's discussion English channel with (off the shelf, gutted) boat on autopilot.
"Yes I think it is possible if you use like a 48" catamaran with 8s 20,000 mah batteries. Sailing at night or a submarine would probably be safer. Let us know how it works out"
Sep 3
Troy Daigrepont replied to john's discussion Any genuine 3dr radios with Ftdi chip?
"I saw this one on ebay....  not sure about the ftdi chip... http://www.ebay.com/itm/282333577888?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649"
Jan 23
john posted a discussion

Any genuine 3dr radios with Ftdi chip?

I bought a chinese clone radio and it had a different usb chip that wouldnt work with my smartphone drivers. So i am trying to find a genuine 3dr usb telemetry module or one with a genuine Ftdi chip. It might be difficult with 3dr not selling them anymore. I have been looking for a clone with an Ftdi chip, but most look like Prolific chips. Any ideas?See More
Dec 18, 2016
Ben replied to john's discussion Crash when ground station signal was lost and using joystick
"Hi John,       Thank you very much for your reply, i will have a try with your solution.     Regards          Ben"
Mar 9, 2016
john replied to john's discussion Crash when ground station signal was lost and using joystick
"Hi Ben, At least I am not the only one with this problem. After modifying the events.pde file the autopilot was able to safely take control and land from a loss of ground station radio signal when using a joystick. I made the changes a year ago to…"
Mar 8, 2016
Ben replied to john's discussion Crash when ground station signal was lost and using joystick
"Hi john:      i encounter the same problem, can you explain  specific modification."
Mar 1, 2016
john replied to john's discussion Is it possible to add a 5 watt RF amplifier to a 3DR/Hope radio module?
"Yes, that would be nice. You might have to overpower the other person's transmitter. A 5 watt linear amplifier would probably work for transmitting and you could use a second module for receiving (and two antennas), but it might be worth…"
Dec 28, 2015
Sandy Mikalow replied to john's discussion Is it possible to add a 5 watt RF amplifier to a 3DR/Hope radio module?
"In the US the FCC frowns on that.  If you have a valid FCC Ham license you can legally increase your power to 1.5 Watts.  With the right antennas that should get you about a 5 mile range.  But now you would be violating the FAA…"
Dec 27, 2015
Jack Rogers replied to john's discussion Is it possible to add a 5 watt RF amplifier to a 3DR/Hope radio module?
"I cant help but think that this would ACE my current project :P diydrones.com/forum/topics/hoperf..."
Dec 27, 2015
Alex Wong replied to john's discussion Is it possible to add a 5 watt RF amplifier to a 3DR/Hope radio module?
"More power is generally not the best solution. It will add to your problems in most cases. Usually antenna placement and checking RF cables for loss will help. In most systems poor quality cable and connectors will have the greatest effect."
Dec 24, 2015

Developer
Bill Bonney replied to john's discussion Is it possible to add a 5 watt RF amplifier to a 3DR/Hope radio module?
"You can connect a 5W linear amplifier and it will work. I assuming the 5W Liner amp has a built in 'RF switch' so the transmit power doesn't reflect directly onto the receiving stage. Unless you are building a home-brew solution? That…"
Dec 24, 2015
john replied to john's discussion Is it possible to add a 5 watt RF amplifier to a 3DR/Hope radio module?
"30km is very good. I don't feel that I need 30km or 60km of range, but I am more concerned about poor reception when flying low near trees or around hills."
Dec 24, 2015
Clay Cranor replied to john's discussion Is it possible to add a 5 watt RF amplifier to a 3DR/Hope radio module?
"I would think that designing a better antenna would be more cost effective way to increase range...  Its no secret that the rubber duckie antennas on both your HT on 440Mhz and the 3DR radios are quite poor and absorb most of the signal they…"
Dec 22, 2015

Moderator
Graham Dyer replied to john's discussion Is it possible to add a 5 watt RF amplifier to a 3DR/Hope radio module?
"FWIW, we're get 30km comfortably with RFD 900's, with a 900MHz patch antenna on the vehicle and two OEM stick-on dipoles on the plane. I think their max power is 1W. 5W seems overkill unless you want to go 60km+?"
Dec 22, 2015

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Hometown:
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