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TIPS and TRICKS

Emax Hawk 5 VTX upgrade tip - POwer Supply

3/12/2018

8 Comments

 
To those of you that choose to upgrade the vtx in your hawk 5, like I did with the AKK infinite VTX/DVR (in this walkthrough here) I've updated my recommendation for the powersupply. Previsouly I relied on the flight controller's 5v BEC circuit that also powers the receiver and of course the board itself. I've now updated this recommendation to use the VBAT (or VCC) power supply instead assuming of course your VTX can take up to 24V as most modern full-sized VTXs can, including the AKK infinite I installed. This is because the BEC struggles at higher output making the video feed noisy. Over the longer term this is likely to irreversible damage the BEC rendering the flight controller pretty well useless but not before having random failures as a result of the compromised BEC. Picture below is using the power supply from the original VTX - the flight controller's 5V BEC:
Picture
I no longer recommned the 5v power supply (red and black wires soldered to board in foreground)
So long as you have a VTX that can accept higher voltages, please use the VCC pad to provide power to your VTX alongside the ground pad next to it. This will bypass the flight controller BEC completely and leav you free to use any and all functions on the VTX. This can be clearly seen circled in the image below and on the quad itself
Picture
I recommend using battery voltage to supply VTX power if your vtx supports it - circled in red
Picture
This is what it looks like now with battery voltage from the VCC and ground pads supplying the VTX/DVR
This is a simple change but will clean up your video and place less stress on your BEC. In hindsight this is maybe why some people are struggling with the stock VTX - it may not be the vtx at all, rather that power that is supplying it that is the issue.
My original Hawk 5 VTX install/walkthrough guide is here and other bang for buck modifications I made to the hawk 5 are here.
8 Comments
Mark
18/12/2018 06:50:39 pm

Thank you for this excellent guide. I have chosen to use Oscars’s Backpack VTX for my Hawk. I have the original VTX already removed and ready. Just waiting for the New VTX to arrive.

I do not think Oscars VTX can accept 24 volts. Do you know if this is true? If so, I should connect to the original VTX location? And Smart audio green wire to

Thanks again for the guide.

Reply
QuadifyRC
19/12/2018 10:18:55 pm

Hi Mark

Thanks for the feedback. Unfortunately this does not apply to your receiver because you need a 5v power source. Please do not use VBAT for your VTX since it doesn't support more than 5v. I'd stick with wiring to the original location + smart audio as per my original VTX install walkthrough.

Reply
Jan Domingo
14/4/2019 10:45:49 pm

I have the akk ulitmate mini. Are you saying i should still wire it up from stock 5v? Not vcc? My vtx support up to 6s.

QuadifyRC
15/4/2019 03:19:37 pm

Hi Jan

I'd recommend reading my new article below:

https://www.quadifyrc.com/tips-and-tricks/emax-hawk-5-vtx-upgrade-tip-power-supply

Jan Domingo
15/4/2019 04:33:59 pm

This is exactly how i did my hawk 5 except using akk ultimate mini instead. Seems to be all working fine. I just read a comment below that confused me.

Reply
Kenn Antvorskov
16/4/2019 12:01:34 am

Thanks for the info ! I actualy also think the problem is the 5v bec that can't deliver propaly.
I just installed a Tramp hv, do you use common ground og just vcc ground ?

Reply
Jan Domingo
16/4/2019 01:06:02 am

I just used vcc and gnd and left signal on the same spot. My stock vtx worked really good for me though.

Reply
Jan Domingo
29/4/2019 10:05:10 am

I use vcc and gnd but now i have noise. Tried using the gnd and 5v on vtx to power my cam but my image would blank out after 1min flight until i zero throttle. So i use the 5v and gnd originally and that fixed the blank screen but noisy now. Idk what else i could do. Might try the Rush vtx.

Reply



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