Radio telemetry kit and OSD..

I have a radio telemetry kit on my hexacopter and am trying to mount a FPV camera on it..

my question is if I have minumOSD then do I need the radio telemetry kit??

what is main difference between??

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Permalink Reply by Bill Bonney on January 10, 2013 at 4:18pm
You don't need the radio telemetry kit if you are happy with only seeing the telemetry data on the received video stream and control is only via r/c control.

If you want to show your position in real-time on a GCS map, or use the copter automonously and change the mission plans whilst you are flying for example, you will need radio telemetry.
Permalink Reply by Peter Kweon on January 10, 2013 at 4:39pm

can I use both?? so I can record data of flight and watch the view through camera and record it...??

if yes, then how do i need to wire them together??

Permalink Reply by criro1999 on January 10, 2013 at 6:39pm

sure you can have them together. you can record data of flight (telemetry) and you can record (and see) the video signal from FPV gear. You need the VideoTX and camera. Also the sound, if you want to hear (record) the motors reaction and vibration, etc.

I would you need to use different frequency between Video Tx for FPV and Telemetry frequency.

Mine is 2.4GHz for RC TX, 900MHz for Video Tx, 800(or 433)MHz for telemetry. For video tx you could find also 1.2 or 5.8 GHz

Take a look at minimOSD documentation and you will see the way how to wire.

minimOSD

Permalink Reply by Peter Kweon on January 10, 2013 at 9:46pm

there is only one APM telemetry port.. how come I can use radio and OSD ports together??

Permalink Reply by Bill Bonney on January 10, 2013 at 10:39pm
You can connect the OSD Rx (receive) pin only to the TX (transmit, data out) pin of the telemetry port. It's only listening (eavesdropping) on the port so the telemetry unit can still work. http://code.google.com/p/arducam-osd/wiki/GCS_usage
Permalink Reply by Peter Kweon on January 11, 2013 at 12:44pm

thanks for help..

Permalink Reply by Bill Bonney on January 10, 2013 at 7:22pm
The APM will record the flight on the onboard flash device, so you only need telemetry if you wish to see real time flight data on a GCS. You can do both. The norm is too have r/c,Telemetry & video on different frequencies. I.e2.4GHz or 72MHz for r/c, 900MHz, 1.3GHz, 2.4GHz or 5.8GHz for video. 433MHz/900MHz/2.4GHz for telemetry. Choices depends on distances flown or country regulations on frequency use.
Permalink Reply by Peter Kweon on January 10, 2013 at 9:52pm

so you mean I need 2RX and 2TX for both radio and video.. right?? because of different frequency...

Permalink Reply by Bill Bonney on January 10, 2013 at 11:02pm
See http://flitetest.com/articles/simple_fpv and there are more links on how everything fits togther.

In summary, people use two frequency bands, not channels, to avoid collisions of one interfering with the other. You can use the same frequency but when you do the transmitters need to be using a complementary frequency usage strategy. Video transmitters are analogue and use only one channel, segment, of frequency and needs lots of bandwidth, so it's good to use a higher frequency and different from RC and Telemetry. Rc and telemetry use less bandwidth and utilize digital technologies and frequency hoping (less interference) so use lower frequencies and can coexist. I.e 2.4GHz r/c and XBee telemetry work ok.

That said most options are 900/433MHz for telemetry, 2.4GHz for RC and 1.3 or 5.8GHz for video.
Permalink Reply by Peter Kweon on January 11, 2013 at 12:43pm

Thanks Bill it really helps...

Permalink Reply by Vincent Cicotte on January 16, 2013 at 2:03pm

Hey Bill and Peter-  My name's Vince and I'm about to get into my first UAV project, and I need some direction.  Any help would be greatly appreciated.  I do, currently have, a working FPV setup in a Skysurfer, and I've read the Arduplane materials several times, so that let's you know where I'm starting from.

I'm scared to order because I'm not completely confident that I "get it." 

I need an autopilot that will get a plane flying a pattern over agricultural land, and I need to be able to change that pattern from the ground when needed (Telemetry Kit, correct???)

I'd also like the plane to have maximum time aloft, and be able to locate it with gps somehow if it crashes.

In addition to the plane and what it needs to fly, I think I need:

  1. Does this look correct?
  2. What am I missing?
  3. Would the planes GPS help me find it if it crashed (relay last coordinates on impact?)
  4. Any suggestions on a plane package that is big and stays up for awhile?  The Skysurfer is great but there might be planes known for UAV endurance.

Thanks for the time!

-Vince

PS-

Purpose/Background Info- I am putting this together for a friend and commercial berry farmer who has thousands of Starlings (birds) destroy his crops every year.  We've noticed that birds of prey send them running from great distances, so I manually loitered my Skysurfer overhead last summer and it sent them running, and kept them away (He was literally jumping for joy). We need to get a plane patrolling above on it's own, if possible.

Permalink Reply by Bill Bonney on January 16, 2013 at 4:33pm

Here's a combined kit from 3DR which supports telemetry. I would also recommend getting an airspeed sensor as this will help with windy conditions.

http://store.diydrones.com/APM_2_5_Not_Assembled_p/br-apmpwrkt2-tel...

http://store.diydrones.com/Kit_MPXV7002DP_p/kt-mpxv7002dp-01.htm

The telemetry will help you find it if it's crashed, but I would recommend having a separate battery for the APM from the the motor. At least if the motor battery is exhausted you would be able to still 'hear' the APM telemetry output.

As for flight time, I can really help you that much. From what I have read it does seem that 1hr seems to be a ballpark max reported. Techpod (http://hobbyuav.com) a new plane design for endurance is claiming it may be able to fly for 2hrs (maybe more). Again this is all experimental, so no real stats to speak of. 

This guy seems to get very long flight times using a glider http://diydrones.com/profiles/blogs/full-autonomous-cross-country-s...

I'm sure others will have more useful information on endurance.

Hope that is helpful :)

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