Welcome to Multi-Rotor UK. Please login or sign up.

Monday,November 18, 2019, 15:50:12

Login with username, password and session length

Shoutbox

ched:
18 Oct 2019 11:25:16
Sounds good yama. Would love to see some images. 3d models sound cool too
yama:
18 Oct 2019 10:32:38
i might have to do a review. the 21mp camera is excellent at producing high quality 3d models for mapping.
ched:
10 Oct 2019 16:56:16
Show us some picys and maybe post a review in a thread?
yama:
09 Oct 2019 14:13:10
must admit this anafi is tiny and looks like a toy in a lunchbox but performs like a professional product.
yama:
09 Oct 2019 14:11:52
went ahead and bought one. about to find out if the 21mp camera improves photogrammetry surveys.
ched:
08 Oct 2019 17:14:17
Not tried a parrot anafi but I thought parrot were stopping 'drone' production?
yama:
07 Oct 2019 13:25:37
anyone tried a parrot anafi?
Gaza07:
26 Sep 2019 11:33:59
We know a song about that dont we  :D
Andy7:
26 Sep 2019 08:38:34
 :laugh:
Bad Raven:
26 Sep 2019 07:10:39
Adopts Australian accent "Black, that's not Black, its a dirty grey, THIS is Black........"   :D
Members
Stats
  • Total Posts: 197136
  • Total Topics: 19878
  • Online Today: 47
  • Online Ever: 530
  • (Tuesday,June 26, 2012, 08:34:46 )
Users Online
Users: 1
Guests: 47
Total: 48

Theme Changer





thumbnail

3d - Printworx

Printing 3d Forum

Make your own Diversity Video Receiver

Started by teslahed, Saturday,March 15, 2014, 03:18:35

Previous topic - Next topic

teslahed

Saturday,March 15, 2014, 03:18:35 Last Edit: Tuesday,March 25, 2014, 21:10:48 by teslahed
My next mini project will be a diversity receiver unit.

I am following Bruce';s build instructions, full credit for the original design goes to Bruce at RCModelReview - thanks Bruce!

I have modified the layout to build it on pad board rather than dead bug style.





With components sources from here;

http://www.bitsbox.co.uk/

More details to follow...
One circlip short of a quadcopter.
 1 lobe short of an antenna.

Jimbodiddly


teslahed

One circlip short of a quadcopter.
 1 lobe short of an antenna.

teslahed

Tuesday,March 25, 2014, 14:30:12 #3 Last Edit: Tuesday,March 25, 2014, 21:13:51 by teslahed
It took me a few attempts, mostly due to my determination to build my diversity receiver on veroboard rather than using Bruce';s ';dead bug'; style. I could have built it dead bug style then filled the thing with epoxy to stop it short circuiting but i prefer the neatness of a ';proper'; circuit and it makes it easier to change things in the future if necessary;






It did take me 3 attempts to get the layout right - but i got there in the end :smiley:
One circlip short of a quadcopter.
 1 lobe short of an antenna.

teslahed

Well my fpv diversity receiver is now tested as working. But one of my two RC305 receivers is dodgy so i wont be using it until a replacement arrives from hobbyking in a week or two.

I was able to connect the single working video receiver up to one video input and then observe the diversity circuit switch to that channel when i also connect up the RSSI signal to the right RSSI input pin. Then if i swap the video signal to the other video input pin i lose my picture as the video input and RSSI input are both plugged into opposite sides of the circuit. Then if i also swap the RSSI signal to the correct RSSI input pin the opposite LED lights up and i get a video signal passed through again.

This is the best i can do to test with only 1 working video receiver. I can only hope that when i have two it will switch between them both in the right way.

I went for the delux option on the video receivers and ordered myself two of these;



So i';ll have a full 32 channel diversity receiver when it';s all working and done  ::)
One circlip short of a quadcopter.
 1 lobe short of an antenna.

powerlord

Nice :-)

Sent from my HTC One using Tapatalk


teslahed

One circlip short of a quadcopter.
 1 lobe short of an antenna.

Col_M

Wednesday,March 26, 2014, 12:05:47 #7 Last Edit: Wednesday,March 26, 2014, 12:23:04 by Col_M
Bruce';s videos are really good and this simple diversity project is great!

However I';m looking forward to his other open source diversity controller that';s less simple which he has mentioned a few times.
I';d be up for doing a "group buy" from a PCB manufactuer when he releases the plans, usually the more you get the cheaper they are so I could order a few (20-30) and sell on the others at cost, it';s open source after all  :smiley:
TBS Discovery : DRQ-250 : Q450 : Blade mQX

teslahed

Wednesday,March 26, 2014, 14:13:34 #8 Last Edit: Friday,March 28, 2014, 00:08:16 by teslahed
I will also be interested in the more involved diversity receiver project and if you end up ordering enough bits to make a few give me a shout please - I';ll likely want to grab some off you if possible, thanks.

Personally i think bruce';s videos are great and very informative, even if i do occasionally feel like I';m back at school when watching them. He obviously puts a lot of time and effort into them and I hope he keeps making more ~~
One circlip short of a quadcopter.
 1 lobe short of an antenna.

teslahed



Well it';s all tested as working.

Except I';ve managed to blow one of my two receiver units:cry. I';m pretty sure i did something stupid with my soldering iron whilst i was trying to get it all working properly. But i';ve tested it all as much as possible using the bits i have and i think i';ll be fine when my replacement RC832 unit turns up.

And of course i will be fitting it all inside a nice box when it';s done.
One circlip short of a quadcopter.
 1 lobe short of an antenna.

teslahed

I';ve just got a second receiver in the post today so i';ve had a quick test of my diversity receiver;



It seems to work fine. I';ve just done another test with a helical antenna on one of the two receivers and it does indeed switch to that receiver when i point the helical towards my aircraft and then back to the omni directional when i point the directional the wrong way.

I';m assuming this means it';s all working fine :smiley:

Next step - get it neatened up and put in a box, then tested properly outdoors.
One circlip short of a quadcopter.
 1 lobe short of an antenna.

HowDoIfly

Excellent work and thanks for sharing this test, despite it not switching as you';d hoped. That "bias" of the omni stood it';s ground really, really well!
Ifly4 no more, Hubsan X4, R550v2, X650F-V4

teslahed

Second test of the diversity receiver - this time with a helical high gain directional antenna as well as a low gain omni.



Seems to do the trick :smiley:
One circlip short of a quadcopter.
 1 lobe short of an antenna.

teslahed

One circlip short of a quadcopter.
 1 lobe short of an antenna.

teslahed



Now with neater wiring and proper plugs!



I';m much happier with the way the diversity switcher seems to be switching in this latest test. I think using 2 similar receiver aerials and putting the low pass filter on the 5 volt power supply have helped since previous tests.
One circlip short of a quadcopter.
 1 lobe short of an antenna.

teslahed

First flight with the new diversity receiver;

One circlip short of a quadcopter.
 1 lobe short of an antenna.

Trev2971

edge of my seat stuff that was fair play  :sick: ....  ~~
TBS Discovery v1 Naza FC / 3d print gimbal
TBS Discovery NazeAcro £100 Special
Alien 500 clone Multiwii
Flamewheel
TBS Discovery Naze32 full
Tbs Discovery aq500pro fc
RCX mini naze acro
Blackout Mini naze acro
HK550 scratch mini nazeacro
building a carbon tri
Hubsan X4 H107L (2)
Hubsan 107D and 10

powerlord

Any chance of doing a detailed instructable. Com on that?  Looks great

Sent from my HTC One using Tapatalk


teslahed

I';m going to have a go with eagletree on thursday evening to see if i can produce a neater circuit diagram (then neater circuit) and I';ll come back with more info hopefully after then.

Otherwise i just followed Bruce';s method and neatened it up a bit. The circuit is identical, just flipped around onto perf board, the inputs and outputs are the same - i just used a bunch of header pins (which i soldered to to make sure of the connection) to make things a little neater and easier to wire to.

I will rehouse the project into a smaller box soon but it';s just a question of holes for power in, video out and the two aerial connections.

I';m happy to answer any specific questions.
One circlip short of a quadcopter.
 1 lobe short of an antenna.

powerlord

Ah cool just watched Bruce';s video.  Actually I think I';ll put one together with an arduino mini pro as the comparators and just use the switches.  Since I';ve got them lying about. It also let';s you do more clever stuff say,  like only switch the signal after its stable for a period,  I dunno really... Prob some stuff there.


Sent from my HTC One using Tapatalk


teslahed

I';ll be interested to hear how you get on with that. I might give it a go myself but my skills with the arduino aren';t good enough to do that by myself i think.
One circlip short of a quadcopter.
 1 lobe short of an antenna.

powerlord

There';s nowt to it.  Easier than what you';ve done. 

It has analogue inputs show you can measure the rssi directly.

And digital outputs to switch video.

Have a look through a few examples on arduino. Cc and you';ll see its a piece of p1ss

Sent from my HTC One using Tapatalk


teslahed

It';s the lack of programming experience that will hold me back i think.

In terms of inputs and outputs, as you say;

2 x Analogue inputs for RSSI on the arduino.

2 x digital outputs on the arduino used to switch 4066 switching chip between the two video signals?

1 x 4066 switcher to take the two video signals in from the receivers and 2 digital inputs in from the arduino to output the best video signal to the monitor.

Seems straight forward enough.

If you have a go i might end up copying you / trying myself.
One circlip short of a quadcopter.
 1 lobe short of an antenna.

powerlord

Yup that';s it.  No advantage really.  But then you are free to code fancier stuff. 

Seriously you';ll see its a few lines of code only,  and the docs have full examples

Sent from my HTC One using Tapatalk


Oakie

Chris thats some serious ups! the skills are overflowing. some super sling shots!

:cool: ~~ :frantic: :bounce:
Only when one looses sight of your toy does FPV become fun and against legislation already in place.

jamie16v

I saw this vid of Bruce';s a good while back and I am now thinking of ditching my antenna tracker project and go with a complex diversity system instead. I';m thinking of a 4 way diversity with 3 helicals on a convex surface at 120 degrees apart in order to get a wide directional coverage, considering if I am doing long range fights it will only be in one direction so no need to track behind me. Also a skew planar on the 4th port to get a good radius coverage. I plan to do all this in 2.4ghz with a 5.8ghz repeater to the goggles.
Thanks for sharing your effort TH, hopefully I can order all the bits soon and get cracking!