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

[Scott Pavlock]

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 on 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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