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

[John Pavlick]

Do you have access to an oscilloscope?

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 5:40 PM
  To: NSRCA Mailing List
  Subject: Re: [NSRCA-discussion] Analog Servo RF Masking and....Thanks!


  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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