Digital Servo Singing

[george kennie]

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
> > > > >
> > > >
> > > > _________________________________________________________________
> > > > From Beethoven to the Rolling Stones, your favorite music is always
> > >playing
> > > > on MSN Radio Plus. No ads, no talk. Trial month FREE!
> > > > http://join.msn.com/?page=offers/premiumradio
> > > >
> > > > =====================================
> > > > # To be removed from this list, send a message to
> > > > # discussion-request at nsrca.org
> > > > # and put leave discussion on the first line of the body.
> > > > #
> > > >
> > >
> > >=====================================
> > ># To be removed from this list, send a message to
> > ># discussion-request at nsrca.org
> > ># and put leave discussion on the first line of the body.
> > >#
> > >
> >
> > _________________________________________________________________
> > From Beethoven to the Rolling Stones, your favorite music is always
> playing
> > on MSN Radio Plus. No ads, no talk. Trial month FREE!
> > http://join.msn.com/?page=offers/premiumradio
> >
> > =====================================
> > # To be removed from this list, send a message to
> > # discussion-request at nsrca.org
> > # and put leave discussion on the first line of the body.
> > #
> >
>
> =====================================
> # To be removed from this list, send a message to
> # discussion-request at nsrca.org
> # and put leave discussion on the first line of the body.
> #

=====================================
# To be removed from this list, send a message to 
# discussion-request at nsrca.org
# and put leave discussion on the first line of the body.
#