Nachtrag
Nachtrag
Folgendes noch zum Problem des Rebootens der Spektrum-Empfaenger:
Zitat
http://www.rcgroups.com/forums/showthread.php?t=809154
"THE POWER SYSTEM PROBLEM
Let me note that the Spektrum receivers do NOT have a brown out issue. I am not defending or attacking Spektrum but it is important to understand the issue. Spektrum can't fix the issue, but they have modified their receivers to better handle the problem.
The problem is that people have not sized their power systems properly to support this new generation of receivers. Of course we did not realize this was an issue until there were hundreds of 2.4 Ghz receivers out there. In some cases the aircraft power systems were not been properly sized to support their 72 MHz receivers either.
The issue is around the power supplied to the receiver. It has to be properly sized or you get an unacceptable voltage sag which can cause ANY 2.4 GHz receiver to reboot. And no properly sized receiver battery or BEC should allow the voltage to sag that low. It is just simply poor matching of components.
Now, the 72 MHz systems, being "dumber" than the 2.4 GHz stuff were just as subject to this but there was no reboot involved. And since the receiver only works on one channel, there was no resync of channels. So a voltage sag might have appeared to be a "glitch" or a "hit" but it was happening there too. We just did not know it was the power system causing it. So someone having a glitching problem who switches over to 2.4 to get rid of the glitching might actually make it worse. They thought it was a receiver issue when it was a power issue.
Also the 2.4 GHz systems pull more power. Typical 72 MHz receiver pulls 10-30 mA while the 2.4 GHz receivers pull 50-100 mA. If the power system was just hanging on by the skin of its teeth, maybe glitching now and then, the 2.4 receiver could push it over the edge. Now it doesn't show up as a glitch or a hit, but as a loss of control till the voltage comes back up and the receiver can reboot and resync with the transmitter.
THE SYMPTOM OF AN UNDERSIZED POWER SYSTEM
On the earlier Spektrums, if the receiver battery or the BEC failed to provide at least 3.1V, plus or minus a little, the receiver would reboot. BTW, Spektrum's stated minimum voltage is 3.5V. That is the voltage under load, not of your receiver pack when no load is applied.
When the power came back up and the Spektrum receiver rebooted it had to resynch channels with the transmitter which was a 2-4 second process. When you are in the air, that is a long time. The newer Spektrum receivers, those produced after July 2007, come up and resync much faster, typically in one second or less.
For the record Futaba is believed to come up faster and reboot at a somewhat lower voltage, but Futaba will suffer outages if the voltage drops too low too. Futaba has made no statement on this that I am aware of. Spektrum has not done anything about the reboot voltage that I am aware of.
As the small electric market was the initial Spektrum target, many Spektrum systems are used in electric planes. This issue shows up as an overloaded BEC.
One cause can be that people do not realize that the higher the pack voltage, the less current most BECs can deliver. So, if your plane was flying on an 8.4V pack, and your BEC was able to deliver 1 amp, you might be fine with 3 micro servos, maybe even 4. But if you change the pack to 11.1V, the BEC might now be limited to delivering 1/2 amp. Now your power system could be on the hair edge of overloading and overheating the BEC, causing a thermal shutdown of the BEC. Add to that an extra 50-90 ma for the new 2.4 GHz receiver and, boom, you have a failed BEC, or one that cuts out, cools, comes back up, overheats, cuts out, cools, comes back up ..... and so on.
The devil in this problem is your BEC does a thermal shutdown and you crash. You check the system afterwards. Of course the BEC has cooled, so now everything works fine. Must be the receiver! This is a tough problem to diagnose without equipment and a hint at where to look.
This has also brought to light that some people don't have enough cooling air passing over the ESC/BEC. So, even if it is properly sized, it can still overheat. This is especially problematic in foamies which are made of an insulating material. Keep those ESC/BECs cool!
As this has become known, tests by users have seen planes operate fine for 3, 4, 5 minutes, then shut down. This has been reported proven based on ground tests.
THERE IS AN ISSUE
There IS an issue, but it is not in the receiver, it is in the power supplied to it. If your power system is sized properly you will never have this problem.
Spektrum has redone the receivers to handle this power drop a bit better. The quick connect is a direct response to this.
So, if your power system falls down on the job and causes a reboot, the newer receivers can reconnect much faster. But you still need to properly size your power system if you want to have trouble free flying with ANY receiver, 2.4 or 72 or 27 or 50 or 35 or 40 or any other system"
Hinweis fuer Tiger 1952 bevor Du loslegts:
Also immer die DX7 mit 5 Zellen fliegen rsp. 2 Lipos (in 1-2 Jahren wahrscheinlich mit 7,4V Lipo-Servos), oder ausreichendem BEC (was immer man darunter verstehen duerfte...).
Es nuetzt Dir also nichts nur die neuen Empfaenger zu kaufen (Reboot bei mir "gefuehlte" 2s, nach obiger Quelle max. 1s), Du musst Dich darum kuemmern, das ein Reboot durch ein ausreichend dimensionierte Spannungsversorgung gar nicht erst noetig wird (z.B. 5 Zellen).
Jürgen
