[NSRCA-discussion] Interference Problem

[Dave Lockhart]

Scott,

 

Put a bunch of trim or subtrim in on the servo and see if the buzzing
decreases.  If not, leave the servo off center, then shift the trim/subtrim
on another servo.  Keep doing this until you've moved all servos off center.
If at any point the buzzing stops, you have an indication which servo is
causing the problem.  A servo that settles down when offcenter is just a
servo that has substantial wear at the center of the pot.

 

Another easy check is to use the slow sweep servo test mode (if you radio
has the function, Code 75 on the 10X).  If the sweep speed (stops, jitters,
speeds up, slows down) of the servo changes as it passes through center, the
pot is worn.

 

I have seen instances where a single bad pot appeared to cause "synmpathy"
jitters in other servos.  Don't overlook the throttle servo - they often
have worn spots in the pots at full or idle, or anywhere inbetween where a
particularly nasty resonance may exist with the
airframe/engine/mount/linkage.

 

Regards,

 

Dave

 

  _____  

From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Scott Pavlock
Sent: Friday, June 16, 2006 7:32 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] Interference Problem

 

I'd be quick to say that was the problem, but there's still the odd buzz in
each of the servos under no load.

On 6/16/06, Jay Marshall < <mailto:lightfoot at sc.rr.com>
lightfoot at sc.rr.com> wrote:

Reminds me of a problem I once had with servos. Had one that was PARTIALLY
bad. If you did a normal control check all was well. However, it you moved
the servos slowly to max they would go ape at some point and short the
battery and therefore taking out ALL of the servos and receiver.

 

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org] On Behalf Of Scott Pavlock
Sent: Friday, June 16, 2006 6:52 PM
To: NSRCA Discussion List
Subject: [NSRCA-discussion] Interference Problem

 

Hopefully someone can help with this. I have been getting interference on my
Focus for the past three flights causing me to land, and I can't seem to
solve the problem. Initially I thought it was the RX and TX, so I changed
them both and moved to an entirely different frequency. I flew the plane
again and it glitched in the air just as the first two times. The glitch is
a quick and significant change in attitude. When I landed, the regulator was
warm so I removed it thinking it was going bad. I replaced it with a regular
4 cell NiCd pack. I changed the receiver once again and am still getting the
glitch. I decided to remove all the arms from my servos (JR Digitals) so
that there would be no load and see how the problem is. The servos, under no
load, buzz considerably. It's not the "I'm under load" type buzz, but more
of a twitching, crackling type buzz. Are my servos going bad? When I plugged
in a new 8417, the buzz is non existant in that servo. 

Any help would be appreciated!!

Scott


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