[NSRCA-discussion] Analog Servo RF Masking and....Thanks!

[vicenterc at comcast.net]

I suggest that you try a battery without a regulator.  Just take an old NiCad to isolate the regulator.

VB

-------------- Original message -------------- 
From: "Scott Pavlock" <f3aflyer7 at gmail.com> 
I've literally tried EVERYTHING possible to isolate the problem. The only problem I can find is solely in the servos. The battery is bran new (duralite 2s2p), bran new heavy duty MPI switch. I can reproduce the problem with the digis with many different switch/battery/regulator set ups. I know current draw isn't a problem as I've flown this set up for 2 years with no faults. 


On 7/4/06, John Pavlick <jpavlick at idseng.com> wrote:
Scott,
 Well I'm sure you've been through a lot already, but what you need to do is try to isolate the problem if possible. Start with a working setup (the analog servos). Next, add 1 digital servo. If it still works, remove that servo and try another. Only change ONE thing at a time. If it works with 1 digital servo ALL THE TIME, then add a second one. If you start to see problems as you add more digital servos (i.e gets worse with 3 or 4 digital servos but seems to work OK with 1 or 2), look at your battery and switch. What are you using for a battery and switch by the way? If your radio checks out OK (RF-wise) it's more likely that there is a problem with power. I bet you didn't have Rx the batteries checked did you? As you know, analog servos don't draw nearly as much current as digital servos. That could be the problem. If you have any way to look at the voltage when all of this is happening it could reveal some things. One way to do this is to put a servo lead in an unused channel o
n the Rx, connect it to a voltmeter, turn everything on and move the sticks. Don't use an Expanded-scale volt meter, just a plain old DVM (or better yet an analog volt meter) will do. See what that tells you.

John Pavlick
http://www.idseng.com
  
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org [mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Scott Pavlock
Sent: Tuesday, July 04, 2006 3:58 PM
To: NSRCA Discussion List
Subject: [NSRCA-discussion] Analog Servo RF Masking and....Thanks!


First I would like to thank everyone for the great advice on these last few posts I've posted. Everyone has been a big help.

I'd like to ask if anyone knows if an analog servo would mask glitches coming in?
(2 - Futaba 3010's, 2 - Hitec HS77's, 1 - HS81MG) 

When I connect my JR digital servos ( 2 - 9411sa's, 1 - 8411sa, 1 - 8417, 1 - 3421sa) I get a pretty significant, constant glitch, as if the servos are constantly trying to center, but they have no load what so ever. This is the problem I have described in previous posts. 

When I connect analog servos in an identical set up, there is no "noise" at all. I range tested them at 100 feet with 1 antenna section up and there is no loss in speed and no sluggish behavior. I also range tested this at about 300 feet with the antenna completely down just for kicks, and I get the same results. 

When I range test the digital servos, even at the 100 foot range with the antenna completely extended there is a significant, constant glitch. The servos, receiver, and transmitter have all just gotten back from being checked and the 9411sa's had new pots put in, the receiver had been re-tuned to the frequency, and the transmitter got a new antenna. I am very surprised with these results as I just spent a fair amount of money to have my electronics looked at and deemed well. 

Now, my question again, are my analog servos just masking a problem, or is this solely a problem in the digital servos?

Thanks a ton everyone!

Scott



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