Digital Servo Singing

Mon Nov 17 09:16:41 AKST 2003

Thanks for all the help with this, guys.  Troy, I did go out and try
loosening / tightening the servo holddown screws, no change.  Same with the
Tx pots (even though it is probably time to send it in for a checkup).  I
think I'll just go with it and watch the battery closely for the first few
flights.

Keith L. Hoard
Cordova, TN
khoard at midsouth.rr.com

----- Original Message ----- 
From: "george kennie" <geobet at gis.net>
To: <discussion at nsrca.org>
Sent: Monday, November 17, 2003 11:54 AM
Subject: Re: Digital Servo Singing

> Keith,
> Save yourself a lot of work! I was at my local field yesterday and there
was an
> IMAC guy there with an Extra 330 with all Hitec servos and that thing was
making
> the Halelujia chorus big time, and was audible from a significant distance
from
> the airplane because it's quite loud . If guys have never heard this
before they
> can only guess about what you're talking about. This VERY high pitched
whine, as
> opposed to the normal servo BUZZ, I was told, has something to do with the
type
> of amplifier the servo employs and is nothing to be concerned with,
however, I
> find the noise to be a little disconcerting.The pilot told me that he has
a full
> season on them without problems.
> Good Luck,
> Georgie
>
>
> Keith Hoard wrote:
>
> > Thanks, Troy.. . . I'll go out and try your suggestions!!
> >
> > Keith L. Hoard
> > Cordova, TN
> > khoard at midsouth.rr.com
> >
> > ----- Original Message -----
> > From: "Troy Newman" <troy_newman at msn.com>
> > To: <discussion at nsrca.org>
> > Sent: Sunday, November 16, 2003 10:39 PM
> > Subject: Re: Digital Servo Singing
> >
> > > That's right H9 makes a new little ammeter deal that goes inline to
check
> > > that sort of thing. I don't have one yet...but I saw them and may have
get
> > > Jenny to loosen the purse strings a little....They are only like
$35-40
> > >
> > > This little tool will tell us a bunch about our radio
gear....Especially
> > in
> > > setting up the big models with multiple servos on each surface....
> > >
> > > You can use it between battery and RX to see what the current draw on
the
> > > enitre system is...And running the motor compare the difference under
> > > vibration compared to no motor....And then try different servos to see
if
> > > this servo or that servo has a higher battery drain....This could also
> > help
> > > diagnose problems with a servos and help find worn pots too...as the
> > servos
> > > will hunt more and draw more power as the pots wear.
> > >
> > > Pretty cool little item.
> > >
> > >
> > > TN
> > >
> > >
> > > >From: davel322 at comcast.net
> > > >Reply-To: discussion at nsrca.org
> > > >To: discussion at nsrca.org
> > > >Subject: Re: Digital Servo Singing
> > > >Date: Mon, 17 Nov 2003 04:11:11 +0000
> > > >
> > > >....and......
> > > >
> > > >if you can put an ammeter inline, see what the servo is drawing at
idle
> > > >(with nothing attached) and compared the idle current to other
similar
> > > >servos - if it is substantially different, change it.  I am not too
> > > >familiar with the Hitecs, so I can't volunteer specific numbers.
> > > >
> > > >Dave Lockhart
> > > >DaveL322 at comcast.net.
> > > > > digital servos are very good at finding center...and holding it
> > > > > there....This takes some power to do it...The hum that you hear
with
> > > > > digitals is common....
> > > > >
> > > > > I would suspect its OK...I don't know much about the Hitecs...but
try
> > a
> > > > > little subtrim or trim and you should be able to get the servo to
> > > > > stop.....Usually the weight of the surface is enough to get a
little
> > > >whine
> > > > > out a digital servo. But with all linkage disconnected...I would
think
> > > >you
> > > > > should be able to get it stop.
> > > > >
> > > > > I would not be overly concerned...maybe the gear train is a little
too
> > > >tight
> > > > > or another option is perhaps when you have bolted down in the
servo
> > > >mounts
> > > > > its not straight and the case is slightly tweaked....I know this
> > sounds
> > > > > funny but I have seen it happen. Loosen the servo mounting screw a
> > > >little
> > > > > and see if it stops...then slowly tighten in an opposing
> > pattern...till
> > > >the
> > > > > servo is snug. DO this while the radio gear is turned on and you
can
> > > >find
> > > > > out if it stops the buzzzzzzz
> > > > >
> > > >
> > > > > Another option...perhaps you Pot is worn an is send a changing
> > > >signal....Say
> > > > > step 1024 and 1023 and the and the servo is fighting itself to get
in
> > > > > between...to check for this try another channel on the
RX...usually a
> > > > > throttle...as the throttle TX pot doesn't get worn at center....
> > > > >
> > > > > But I think you may be OK...these are just precautions...and I bet
> > > >you'll
> > > > > find it....If it is one of these two little things...not too much
to
> > > >worry
> > > > > about.
> > > > >
> > > > > TX pots can be serviced...and the servo mounting twist can be
fixed
> > > >easy....
> > > > >
> > > > >
> > > > > >From: "Keith Hoard" <khoard at midsouth.rr.com>
> > > > > >Reply-To: discussion at nsrca.org
> > > > > >To: "NSRCA Mailing List" <discussion at nsrca.org>
> > > > > >Subject: Digital Servo Singing
> > > > > >Date: Sun, 16 Nov 2003 21:39:39 -0600
> > > > > >
> > > > > >Guys,
> > > > > >
> > > > > >     I've just installed my first digital servos. . . Hitec's.
One
> > of
> > > >them
> > > > > >"sings" continuously even when it is not under any load.  Is this
> > > >normal??
> > > > > >I'm using a 4-cell 1200Mah Nicd pack (if that makes a
difference).
> > > > > >Thanks!!
> > > > > >
> > > > > >
> > > > > >Keith L. Hoard
> > > >
> > > > > >Cordova, TN
> > > > > >khoard at midsouth.rr.com
> > > > > >
> > > > >
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