how to build a 5.8Ghz micro FPV setup

There are many ways to rig up a micro FPV system.
Above is a sample of Benedikt's favourite setup.

here is the part list:

essential:
- 400mW vTx, 5V ($15 @ Banggood)
- 90˚ 520vtl cam ($45 @ RMRC, $40 @ Banggood)
- micro CL antenna ($4 @ Banggood)
- 5V step-up ($3 @ RMRC)
(the step-up gets your the right voltage, but it also does a very important thing: it filters the voltage, so you get a clean supply voltage for the camera gear. If you dont use a voltage regulator, you get interference, e.g. lines in the video stream).

optional:
- 3-pin connectors (eBay) to make everything modular
- 4-way, 2.54mm, DIP-switch (eBay) for channel selection
(you only have 3 positions to switch, but the 4-way switch physically fits better)

and here basic assembly instructions:

antenna:
- cut antenna to right(?) length
- twist antenna shielding into a fork shape
- solder antenna middle part to "ANT" pad
- solder shielding to "GND pad"

switch:
- solder legs to CH1, CH2, CH3. Snip extra leg.
- solder other side legs to the top of the housing

wiring:
- use power from FC power connector (e.g. underside of FC), connect to GND and VIN pins of voltage regulator
- from voltage regulator, using GND and VOUT pins, connect to GND and VCC on vTx and camera
- connect video wire from camera to vTx

In October 2015, we had a little video contest here.
You can see the submitted tutorial videos below. Watch all of them, and you know everything you need to build your own!

Have more questions? Submit a request

Comments

  • Avatar
    Jeff comer

    Challenge Accepted!

  • Avatar
    Lszewczy0367

    One FPV tutorial on its way! I just ordered all the parts and should have the video up as soon as the parts arrive. (Some time next week) (I really want the store credit to build a micro racing machine for the micro fpv setup!)

  • Avatar
    Adam Madron

    Dang it, looks like I am always late to the party. Any winners yet? I would like to take a stab!

  • Avatar
    Benedikt Haak

    No one submitted yet. All bets still open ;)

  • Avatar
    Jeff comer

    Yep, still waiting on Banggood to get their act together, unfortunately.

  • Avatar
    Lszewczy0367

    Same here, the 5.8G antennas are 2 weeks out sadly.

  • Avatar
    Shawn

    Benedikt, You have brought the micro CL antenna market to it's knees. :) Even Hobby king has many of theirs on Back order. :)

  • Avatar
    Benedikt Haak

    Well, if thats true, I call it success already ;)
    BG says "expected stock Sep. 29th". Lets see!

  • Avatar
    prOkrEAt

    i ordered on sept 11th, got an email the 25th that it shipping out, check my orders on the site and the ship date keeps moving with whatever date it is that day... SLOW o.O maybe will get it in time for xmas?

  • Avatar
    Adam Madron

    How's this Benedikt? https://vimeo.com/141795827

  • Avatar
    Peter Newman

    That is a mighty fine effort Adam. Your video presentation skills are development along nicely there

  • Avatar
    lucas szewczyk

    Here is my submission. What do you guys think?
    https://www.youtube.com/watch?v=cjL5XtX_9HA

  • Avatar
    Adam Madron

    Makes me look bad Lucas ;) Nice job sir, looks like you may have done this a few times. Just put together my second with the 5802 Vtx 200mw and have a few more parts coming from BG for the 5826's hopefully before my next birthday ( that's in May) haha I really had to butcher my recordings to get my video to even what I consider a mediocre level due to camera shutting off in the middle of some of the operation.

  • Avatar
    Jeff comer

    Man, I'm really behind the 8-ball now! Still no banggood in the mail yet :(. Great videos to watch in the meantime though! Going to be hard to compete with you guys.

  • Avatar
    Benedikt Haak

    Very nice, Lucas! Lots of good tips besides the actual build, I think that will help a lot of people.
    Can we hook you up with some gear in return for your efforts? Please send me an email or use the "submit request" button on this page and tell us what you need!

  • Avatar
    Adam Madron

    Lucas, Like Benedikt said that was a very nice video and very informative. Benedikt has created a new community group for the micro brushed enthusiasts out there. The more brains the better I say so if you haven't checked it out come see what is happening http://community.micro-motor-warehouse.com/

  • Avatar
    Brendan Haines

    What do you guys think of my video?
    https://youtu.be/vR6ZFZi0l30

  • Avatar
    Adam Madron

    Nice video Brendan. Posted to the community site. So have you experimented and confirmed that the coaxial length of the antennae is important or do you have reference of facts? I have seen some that say it is important and others not but what is crucial is the length of the lobes on the antennae for specific frequencies not necessarily the coaxial.

  • Avatar
    Adam Madron

    One more question. Where is the measurement taken from? Top of spiral, bottom?

  • Avatar
    Jeff comer

    @Adam. I have heard two things regarding this. The first being that the coaxial length does not matter as it is shielded, only the length of the cloverleaf sections that aren't shielded. However, there can be some attenuation that occurs over the length of the shielded section, and cutting it to half or full wavelength is good practice. If you look at IBcrazys race spec antenna as an example, it is a short antenna for low profile, but I beleive he cuts the coaxial to wavelength and then folds it up and heat shrinks it to make it physically shorter, while retaining a certain coaxial length. I have used these antennas and they are made of magic. I am willing to bet if I cut it open and measured that coaxial, it would correspond to 5.8 wavelength. Cheers!

  • Avatar
    Brendan Haines

    I have not yet experimented with real world feed lengths. I was referring to theoretical lengths for standing waves. Basically, any solder joint can create a reflected signal back down the coax.
    Since so many people already ignore feed length and their antennas still work, I think we can probably do the same without too much signal loss. I just hate to do things in a non-ideal way, so I wanted to include the theoretically correct answer.
    The measurement should be from the end of the coax to the point where reflections occur (the join between coax and CL), so the bottom of the cloverleaf.

    I'm not sure why IBcrazy would want to increase the length of coax more than to 1/4, 3/4, etc wavelength. Not only would he have a standing wave at 1 wavelength, but he would also be attenuating signal more by having a longer cable (granted 1.3cm more cable will not have a significant impact on signal attenuation, but longer pieces would).

  • Avatar
    Benedikt Haak

    Hi Brendan, nice job on the video!
    I was also very happy to see some form of theory (RF is always guesswork to a degree) about the length of the antenna stated. Those different lengths make sense, I will start cutting mine short.

    Please contact us over the "request" button on top of this page, and will get some parts underway for your efforts!

  • Avatar
    Benedikt Haak

    PSA:

    We have three video contributions now - Im very happy with the result. Every video added new aspects, and I combined, this is an excellent source for people to join the game.
    Excellent work, gentlemen!

    If you are late to the party and still waiting for parts or working on your video, I got some good news:
    Adam has his plate already full and donates his prize to the next contestant. Thank you, Adam - the show can go on ;)

  • Avatar
    Brendan Haines

    Just a little more information on feed lengths and standing waves in the coax. According to the ARRL (American Radio Relay League), the feed length matters a lot when there is a high SWR (standing wave ratio), but very little with an SWR of 1:1 (ideal). SWR is the ratio of resistive loads of the antenna and feed line. A possible explanation for feed length anecdotally not influencing performance is that the antennae being used may have very good SWR and therefore not be influence as much by feed length.

    Source:
    http://www.arrl.org/files/file/Technology/tis/info/pdf/q1106037.pdf

  • Avatar
    Adam Madron

    Brendan,
    Thank you very much! I did research this for at least 1/2 a day before concluding that the consensus was that it didn't matter and maybe that is just the fact that the setup will work with any length coax but maybe that is not the optimum performance you could get if the length of the coax was withing the wavelengths parameters. I do like a good experiment and figuring things out so I will also experiment with this and see if I have better results with the coax cut to specif lengths for the 5.8Ghtz. Thank you for such a thorough explanation to the question.
    I am all about letting the next guy have his shot Benedikt ;) I play fair and like you said. I do have a handful!
    Jeff, also thank you for your answer as well. You could be the next contestant!

  • Avatar
    Jeff comer

    Thanks Adam! That's a mighty generous thing to do! You are a gentleman and a scholar! I definitely plan to make a video if my stuff ever shows up. I ordered on the 8th of September and still no love! Honestly, I'm trying to think what I can even do to contribute more at this point, both your guys videos are pretty thorough!

  • Avatar
    Adam Madron

    Well there is always a such thing as style and everyone seems to have their own. Lucas and Brendan did a fine job and after watching each of their videos I see things that I may have missed and I had to butcher mine pretty good to get the usable video due to camera difficulties.This was also the first time I did the DIY FPV and have since built 4 more which all turned out much better.
    As far as BG goes, I feel your pain. I ordered my stuff on the 12th of september and it arrived last week some time. I also had a wrong item in the order and a missing cam. So I am currently trying to deal with BG on that and they keep requesting more info although I told them exactly what was the issue 3 times now with pictures and they still respond with some stupid reply. Feels like a ploy to frustrate someone into forgetting about trying to get resolution. I hope your stuff comes in soon.

  • Avatar
    prOkrEAt

    we should move this into the new forum, but my take on length is that the inner wire is shielded by the braided wire, the freq and reception is probably all based from the + to - end points of the cloverleaf so i would guess that the length is irrelevant. not to mention i run pigtails on my mini which "extend" the length of my antenna before it hits the vTx.

    thats just my own logic of it all... probably wrong though.

    BTW, STILL havent received my CL from banggood either. they keep changing the ship date on my account order list. i dont know if it really has shipped or not. i think best way to order from banggood is to be drunk, order, forget you did and then a few months later it shows up at your doorstep and its like xmas.

  • Avatar
    Jeff comer

    Here is my submission! Finally got all the goods in today!

    https://youtu.be/V_OOUwidJZY

    Thanks to everyone on the thread for all of their contributions!

  • Avatar
    Jeff comer

    PS: Not sure why my processed video seems to cut out at certain points. Doesn't display this way in the editing software. May try exporting the video differently to try to clear it up.

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