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<DIV><SPAN class=535201121-10082006><FONT face=Arial color=#0000ff size=2>Oh
yeah! More test instruments I gotta borrow from work!</FONT></SPAN></DIV>
<DIV><SPAN class=535201121-10082006></SPAN> </DIV>
<DIV> </DIV>
<P><FONT face="Times New Roman">Dean Pappas</FONT> <BR><FONT
face="Times New Roman">Sr. Design Engineer</FONT> <BR><FONT
face="Times New Roman">Kodeos Communications</FONT> <BR><FONT
face="Times New Roman">111 Corporate Blvd.</FONT> <BR><FONT
face="Times New Roman">South Plainfield, N.J. 07080</FONT> <BR><FONT
face="Times New Roman">(908) 222-7817 phone</FONT> <BR><FONT
face="Times New Roman">(908) 222-2392 fax</FONT> <BR><FONT
face="Times New Roman">d.pappas@kodeos.com</FONT> </P>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of
</B>DaveL322@comcast.net<BR><B>Sent:</B> Thursday, August 10, 2006 3:17
PM<BR><B>To:</B> NSRCA Mailing List<BR><B>Subject:</B> Re: [NSRCA-discussion]
ESC and RX intereference<BR><BR></FONT></DIV>
<DIV>Bob,</DIV>
<DIV> </DIV>
<DIV>The servo lead is wrapped through the ring thingy 2 or 3 turns (per the
ring thingy instructions). The spectrum analyzer thingy just might
happen one day soon in the Pappas driveway. Eh Dean??</DIV>
<DIV><BR>Dave</DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">--------------
Original message -------------- <BR>From: Bob Richards
<bob@toprudder.com> <BR>
<DIV>Dave,</DIV>
<DIV> </DIV>
<DIV>FWIW, the ferrite bead ("iron ring thingy") attenuates common-mode
currents on the cable. You might also try wrapping the ESC lead through the
ring more than once, this will increase the low-frequency attenuation, but
may decrease the attenuation at higher frequencies.</DIV>
<DIV> </DIV>
<DIV>It would be interesting to put a small current clamp on the ESC lead,
connected to a spectrum analyzer, to see exactly what type of emissions you
are dealing with.</DIV>
<DIV> </DIV>
<DIV>Bob R.</DIV>
<DIV><BR><BR><B><I>DaveL322@comcast.net</I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">
<DIV>With my Abbra, I had throttle glitches (but no radio holds) and no
amount of re-routing wires or antenna helped. 3 different RXs made
no difference (2 770s and 1 649, all SC JR). Adding a choke (the
iron ring thingy) to the ESC lead immediately adjacent to the RX fixed the
problem. Of note, ESCs used were CC Phx 45 and 85 and the glitching
did not occur with setups that were <55 amps. I've now run up to
85 amps no problems.</DIV>
<DIV> </DIV>
<DIV>I had the same thing with my Prestige - throttle glitches but no
radio holds. The same choke helps, but wasn't a 100% fix.
Rotating the RX 90 degrees (in any orientation) had an effect, so I picked
the "best" orientation and only an occasional throttle glitch
remained. I recently changed from the 770 to the 790 (synth SC) and
that is better still (99.9% fixed).</DIV>
<DIV> </DIV>
<DIV>Regards,</DIV>
<DIV><BR>Dave Lockhart</DIV>
<DIV><A href="mailto:DaveL322@comcast.net">DaveL322@comcast.net</A></DIV>
<DIV>Team JR</DIV>
<DIV>Team Castle Creations</DIV>
<DIV> </DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">--------------
Original message -------------- <BR>From: Chad Northeast
<chad@f3acanada.org> <BR><BR>> FWIW, I have an identical
equipment setup as Adam, even placing of the <BR>> gear is near the
same. We built the planes together, use the same <BR>> paint,
covering etc. The only difference is I use Futaba radio gear <BR>>
(9Z, R319DPS rx)...and have never once went into hold. I think we came
<BR>> to the conclusion that there is something going on with DC rx's
and how <BR>> they filter out noise vs. SC rx's in some setups.....as
both our setups <BR>> on DC work great, and Adam's on SC did not.
<BR>> <BR>> Maybe someone with a bit more EE knowledge could
explain why this would be. <BR>> <BR>> Chad <BR>> <BR>> Adam
Glatt wrote: <BR>> <BR>> >I'm forwarding the conversation I had
with a pattern buddy to the list <BR>> >in the hopes! ! it wi l l
save someone else's airplane. <BR>> > <BR>> >Adam Glatt
<BR>> >Team Shulze <BR>> >Team Plettenberg <BR>> >
<BR>> >-------- Original Message -------- <BR>> >Subject:
Re: ESC and RX intereference <BR>> >Date: Wed, 09 Aug 2006
21:38:14 -0600 <BR>> >From: Adam Glatt
<ADAM.G@SASKTEL.NET><BR>> >To: <BR>> >**** <BR>> >
<BR>> > <BR>> > <BR>> > <BR>> > <BR>>
>Yikes, that sucks. <BR>> >I was going into hold about every
tenth flight with my Mantis (Xtra <BR>> >25). When I switched to
the Twister I was going into hold about three <BR>> >times a
flight (EVO). I tried everything (new TX antenna, new TX <BR>>
>module, new TX crystal, new RX crystal, new RX, twisting elevator
servo <BR>> >leads, choke on ESC line...). The only things that
helped were running <BR>> >the antenna along the wing, and
switching to a JR dual conversion <BR>> >receiver! . ! Sin ce s
witching to the DC RX I've never had a moment of hold. <BR>> >This
electric motor stuff is definitely causing interference with the
<BR>> >RX. It is very important to set your failsafe to have the
throttle go <BR>> >to idle. This way, when it goes into hold, it
will chop the throttle, <BR>> >which ends the interference. I also
set my failsafe to deflect the <BR>> >rudder a bunch so it is very
obvious when hold is occuring (good when <BR>> >trying to sort out
the problem, bad when trying to compete). <BR>> >I'm betting your
only solutions are switching to Futaba or Hitec TX+RX <BR>>
>systems, or using a vastly different receiver: JR DC, Berg 7 (just
<BR>> >released), Sombra Shadow, GWS... <BR>> > <BR>>
>I have a spare ch48 JR DC RX crystal that I can send you, and I can
sell <BR>> >you a Sombra RX through work. Other than that you'll
need to source <BR>> >your solution elsewhere. If you want to! try
! the Ber g 7 I suggest <BR>> >phoning Castle directly, as no
dealers have it yet. <BR>> > <BR>> >It's also possible that
a different brand ESC will fix it. I can sell <BR>> >you an HV85
through work for cheap. <BR>> > <BR>> >I've been down this
road. The EVO + Schulze system interferes with <BR>> >something in
the JR SC PCM receivers - that much I'm sure of. <BR>> > <BR>>
>-Adam <BR>> > <BR>> >******* wrote: <BR>> >
<BR>> > <BR>> >>Hello Adam, <BR>> >> <BR>>
>>I had a problem with my radio yesterday and I want to check with
you <BR>> >>since it maybe the same cause as you. <BR>>
>> <BR>> >>I was trying the Evo for the first time
yesterday evening at the field. <BR>> >>I range checked before
the flight but not with motor running. That may <BR>> >>have
been a big mistake now that I think about it. Anyway the flight was
<BR>> &g! t;>f i! ne unti l I got to the horizontal 8. Just
past the middle of the first <BR>> >>loop down, the motor
stopped and the control went to neutral. The plane <BR>> >>was
going down inverted at about 45 degree and hit the ground. I tried
<BR>> >>elevator and ailerons with no success. Amazingly, the
wing, batteries, <BR>> >>ESC, motor are fine. The prop just
folded, the wing didn't come off but <BR>> >>the aileron servo
gear stripped. The other servos works ok. There are a <BR>>
>>bunch of cracks in the fuse but I put everything back in place
with CA <BR>> >>and tonight I will put some glass and carbon
fibre inside. I rechecked <BR>> >>the range after the crash,
checked all connections and can't found <BR>> >>anything. My
transmitter is a 10X with the synthesizer module. <BR>> >>
<BR>> >>My friend ***** told me the ESC may have cause the fail
safe condition. <BR>> >>The moto! r was b ack ! to low throttle
before the fail safe happened. You <BR>> >>say in the message
below that you had interference this year. Was that <BR>>
>>only with the Evo and its ESC ? I had 122 flights with the std
30-10 and <BR>> >>ESC with no problem at all with the R770 and
the R2000 since around the <BR>> >>middle of Jul. I was
planning flying tomorrow with another TX & RX if <BR>>
>>the plane was ready but now I am thinking of checking the range
with the <BR>> >>motor running before going to the field again.
<BR>> >> <BR>> >>What do you think ? <BR>> >>
<BR>> >>****** <BR>> >> <BR>> >> <BR>>
>> <BR>> >> <BR>> >> <BR>>
>>>-----Original Message----- <BR>> >>>From:
nsrca-discussion-bounces@lists.nsrca.org <BR>>
>>>[mailto:nsrca-discussion-bounces@lists.nsrca.org] On Behalf
Of Adam <BR>> >>>Glatt <!
BR>> >&! gt;> Sent: July 4, 2006 11:10 PM <BR>>
>>>To: NSRCA Mailing List <BR>> >>>Subject:
[NSRCA-discussion] WTBuy or WTBorrow: JR Dual Conversion <BR>>
>>>receiver crystals (red) ch48 and ch30 <BR>> >>>
<BR>> >>> <BR>> >>>I've been having nonstop
radio interference problems this year but <BR>> >>>finally
solved it by installing a JR dual conversion PCM receiver. <BR>>
>>>However, I don't have receiver crystals for this receiver on
the <BR>> >>>channels I'm set to fly in Muncie. I need the
red JR dual conversion <BR>> >>>receiver crystals in
channels 48 and 30. I'll buy them or borrow them <BR>> >>>
<BR>> >>> <BR>> >>> <BR>> >> <BR>>
>> <BR>> >> <BR>> >>>during Muncie. <BR>>
>>> <BR>> >>>-Adam <BR>> >>> <BR>>
>>> <BR>> > <!
BR>> >________! _______ ________________________________
<BR>> >NSRCA-discussion mailing list <BR>>
>NSRCA-discussion@lists.nsrca.org <BR>>
>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion <BR>>
> <BR>> > <BR>> > <BR>>
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NSRCA-discussion mailing list <BR>> NSRCA-discussion@lists.nsrca.org
<BR>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
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