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Old 09-19-2021, 04:48 PM   #1 (permalink)
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Location: Lancaster, PA
Question 4651T Receiver Frame Losses

I am running my FC6250HX on a SAB Buddy 380, I mounted the 4651T receiver on the bottom of the boom and servo bracket with the whiskers hanging out the back in open air. I am doing general sport flying and during a turn at the far end of the field when the nose pointing down in the turn, when I go to push up on the elevator stick to level, it just keeps going down with no elevator response. Of course, the result is rapid contact with the ground. Upon examination of the flight log screen, I had an A value of 768 and an F value of 350, H is 0. In this flight position, the bulk of the heli frame is between me and the receiver antenna, so it is possible that is blocking the signal??? I am thinking I need to put a 9745 satellite receiver on it, but does it make sense to be losing that many frames? Is that enough to cause a loss of control or could there be something wrong with the receiver? I have 6250's on three other birds, two OXY 3's with no satellite, and never saw a frame loss period. Also, I have a TRex 550 with a satellite, but never see any frame losses on either A or B antenna. Adding a satellite to the Buddy should fix it, but I wanted to get any thoughts around the health of the existing 4651T.
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Old 09-20-2021, 02:56 PM   #2 (permalink)
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The fades are not horrible but not the best. Use an additional 9645 and get both antennae so they are 90 to the main set on the 4651T. I would move the 4651T to the top of the boom and use the 9645 on the side of the frame near the rear and the antennae hanging out past the frame. Also, and this is a big one, update your 4651T. There is an issue that has a false appearing loss of signal resetting of the ESC which might be what is going on (maybe not but it is best to update the 4651T remote). So you know, the 6250 does not show frame losses on the left side where the ABLR numbers are located. The 6250 is the gyro and the single number "1" indicates the number of remotes. When you add another remote, it will change to 2, if you are not already aware of this. By the way, adding another receiver without updating the 4651T will not solve the issue. If you are keeping your 380 close in, updating and moving the remote to the top of the boom should help. Also, if you are in close, you may not even need an additional remote but you can never have enough in my opinion, lol. I have both 6250s set up with the 4651Ts on the tops of the boom and they seldom have more than 2 fades. Hope this helps.

Don
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Old 09-21-2021, 11:13 AM   #3 (permalink)
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Ah, you were right the 4651T was in need of an update. In fact all of my 4651T's needed the update. I have kept my 6250's up to date but didn't think about the receivers. Good call. I am looking at how I can move the 4651T to the top of boom, but that is also where I have the 6250 mounted. I could mount the 4651T on top of the 6250, but it is very busy there and the whiskers would be inside the Buddy canopy, although I doubt the thin fiberglass would attenuate the signal very much. I am afraid if I mount it on the boom itself, the next crash could tear it up if the boom gets ripped off (hopefully that won't happen anytime soon). I was also thinking about putting the new 9745 out the front of the heli frame.

Thank you for your thoughtful insights...
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Old 09-27-2021, 09:03 AM   #4 (permalink)
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Thumbs up Problem Solved - Bad Receiver

Just for closure, it turned out to be a bad 4651T receiver. After finally interpreting the Flight Log screen, the signal strength on the receiver was less than half of what it was on a healthy 4651T. I worked with Horizon Hobby and they sent me a warranty replacement. Great customer service by HH
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