Digital Servo Singing

Mon Nov 17 16:02:21 AKST 2003

I have been running the same set of Hitec digitals for two seasons now, and
they have made that singing sound from day one, but it has never had any
negative effect. As far as power consumption, they draw no more than the
coreless servos I replaced
. The only problem I have had is sloppy gear train after a while, which I
guess is normal with metal gears.
----- Original Message -----
From: "george kennie" <geobet at gis.net>
To: <discussion at nsrca.org>
Sent: Monday, November 17, 2003 12:54 PM
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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