Posts: 6 Threads: 1 Likes Received: 0 in 0 posts Likes Given: 0 Joined: Nov 2016 Reputation: 0 25-Nov-2016, 05:07 AM (This post was last modified: 25-Nov-2016, 05:43 PM by tdogb.) When I take off with a fully charged battery my quad flies for 10 seconds and then the vtx/goggles (not sure) switches 2 channels. Regardless of distance/speed. After I crash the video comes back. I know it is switching channels because if I have someone else look through goggles as I fly line of sight they are able to switch down/up 2 channels and have the video work. When I take off with my battery at 14~15v it flies fine, and the video looks great. I have replaced, VTX, Camera, osd, wires, tx antenna Camera running on 5v, osd on 5v and vtx on 12v I am suspecting the 12v regulator on the pdb. People in the reviews of the pdb say it is bad but I don’t know if that is causing the vtx to switch channels. Setup: Ts5823 Matek PDB: http://www.banggood.com/Matek-Systems-PD...mds=search Cloverleaf antenna Teleporter V4 HS1177 MinimOsd UPDATED INFORMATION: Takes exactly 20 seconds for video to go out at 16.4v As soon as battery hits 15.5v there are no dropouts. Datasheet for 12v regulator: http://www.st.com/content/ccc/resource/t...000447.pdf • Posts: 1,773 Threads: 30 Likes Received: 1,199 in 755 posts Likes Given: 714 Joined: Oct 2016 Reputation: 45 I've never heard of this before, but I highly doubt it has anything to do with the PDB. If you've replaced everything and it's the same, it must be in your setup. If it does it with both VTXs, I'd rule that out and concentrate on the goggles. Possible a faulty channel search button? The only other thing that comes to mind is how you have your VTX fastened. If it's with a ziptie and it's across the channel switching button, maybe the movement of the quad is causing the ziptie to compress the button? • Posts: 6 Threads: 1 Likes Received: 0 in 0 posts Likes Given: 0 Joined: Nov 2016 Reputation: 0 (25-Nov-2016, 05:30 AM)RENOV8R Wrote: I've never heard of this before, but I highly doubt it has anything to do with the PDB. If you've replaced everything and it's the same, it must be in your setup. If it does it with both VTXs, I'd rule that out and concentrate on the goggles. Possible a faulty channel search button? The only other thing that comes to mind is how you have your VTX fastened. If it's with a ziptie and it's across the channel switching button, maybe the movement of the quad is causing the ziptie to compress the button? There is nothing hitting the dip switches, however I don't remember if this happened with my old vtx, I don't think so. But the one I have on it now was brand new. • Posts: 634 Threads: 56 Likes Received: 335 in 196 posts Likes Given: 183 Joined: Mar 2016 Reputation: 15 Simple ruleout, do you jave acces to other gogles especialy other vrx? This way we can narrow it down to quad All the best Grzesiek (Grisha/ Greg) Curently flyable: Nox 5, Minimalist 112 Bench / in progres: fixing Nox 3, Scrap thinking about building: 450 • Posts: 1,149 Threads: 50 Likes Received: 704 in 450 posts Likes Given: 1,189 Joined: Sep 2016 Reputation: 30 Does it also happen in a gentle hover? I.e. when it doesn't draw a lot of battery power. • Posts: 6 Threads: 1 Likes Received: 0 in 0 posts Likes Given: 0 Joined: Nov 2016 Reputation: 0 (25-Nov-2016, 10:14 AM)fftunes Wrote: Does it also happen in a gentle hover? I.e. when it doesn't draw a lot of battery power. Yes it happens regardless if I am in a gentle hover or an all out burnout • Posts: 6 Threads: 1 Likes Received: 0 in 0 posts Likes Given: 0 Joined: Nov 2016 Reputation: 0 UPDATED INFORMATION: Takes exactly 20 seconds for video to go out at 16.4v As soon as battery hits 15.5v there are no dropouts. Datasheet for 12v regulator: http://www.st.com/content/ccc/resource/t...000447.pdf • Posts: 1,149 Threads: 50 Likes Received: 704 in 450 posts Likes Given: 1,189 Joined: Sep 2016 Reputation: 30 No clue about that PDB, but on my quads i feed my vtx directly from battery balancer plug (just using 3 cells of the 4s packs). • Posts: 6 Threads: 1 Likes Received: 0 in 0 posts Likes Given: 0 Joined: Nov 2016 Reputation: 0 (25-Nov-2016, 06:07 PM)fftunes Wrote: No clue about that PDB, but on my quads i feed my vtx directly from battery balancer plug (just using 3 cells of the 4s packs). How did u make that? • Posts: 1,149 Threads: 50 Likes Received: 704 in 450 posts Likes Given: 1,189 Joined: Sep 2016 Reputation: 30 (25-Nov-2016, 06:14 PM)tdogb Wrote: How did u make that? A balancer extension cable soldered to vtx, but cut off 2nd, 3rd and 5th wire, so there's only ground wire and the one coming from 3rd cell. Posts: 2,416 Threads: 51 Likes Received: 1,861 in 1,175 posts Likes Given: 3,315 Joined: Mar 2016 Reputation: 74 (25-Nov-2016, 06:36 PM)fftunes Wrote: A balancer extension cable soldered to vtx, but cut off 2nd, 3rd and 5th wire, so there's only ground wire and the one coming from 3rd cell. What a great tip fftunes! • Posts: 1,149 Threads: 50 Likes Received: 704 in 450 posts Likes Given: 1,189 Joined: Sep 2016 Reputation: 30 (25-Nov-2016, 06:50 PM)sloscotty Wrote: What a great tip fftunes! Thx i also find it convenient to not have to power it all simultaneously - i can check video before powering motors or fly LOS without video. Just make sure your vtx is protected from voltage spikes. • Posts: 6 Threads: 1 Likes Received: 0 in 0 posts Likes Given: 0 Joined: Nov 2016 Reputation: 0 I actually have a feeling it is a temperature issue with the voltage reg. A higher difference in voltage e.g. 16.4v and the 12v output means the chip will get hotter. However it started acting weird again when it was really hot outside, but when I came inside and let it cool off it worked fine again. I could try puting on a heatsink, but do u guys have any other ideas? • |