Digital Servo Singing

[Keith Hoard]

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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