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<DIV><SPAN class=986320721-10082006><FONT face=Arial color=#0000ff>Hi
Steve,</FONT></SPAN></DIV>
<DIV><SPAN class=986320721-10082006><FONT face=Arial color=#0000ff>That's the
same thing as Dave's many loops through a ferrite donut. Granted it is small and
light.</FONT></SPAN></DIV>
<DIV><SPAN class=986320721-10082006><FONT face=Arial color=#0000ff>thanks for
the find,</FONT></SPAN></DIV>
<DIV><SPAN class=986320721-10082006> <FONT face=Arial
color=#0000ff>Dean</FONT></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>-----Original Message-----<BR><B>From:</B>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of </B>Steven
Maxwell<BR><B>Sent:</B> Thursday, August 10, 2006 3:29 PM<BR><B>To:</B> NSRCA
Mailing List<BR><B>Subject:</B> Re: [NSRCA-discussion] ESC and RX
intereference<BR><BR></FONT></DIV>
<DIV>
<DIV> Would this be a fix Dean found it on the RCU electric pattern forum
once.</DIV>
<DIV><A
href="http://www.multimodetech.com/index.php?option=com_content&task=section&id=1&Itemid=2">http://www.multimodetech.com/index.php?option=com_content&task=section&id=1&Itemid=2</A></DIV>
<DIV> </DIV>
<DIV>
<DIV>Steven Maxwell</DIV>
<DIV></DIV>
<DIV></DIV>
<DIV> </DIV></DIV></DIV>
<DIV> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid">
<DIV style="FONT: 10pt Arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=d.pappas@kodeos.com href="mailto:d.pappas@kodeos.com">Dean
Pappas</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To: </B><A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A></DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> 8/10/2006 11:42:04 AM </DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] ESC and
RX intereference</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=601541415-10082006><FONT face=Arial color=#0000ff>Hi
Gang,</FONT></SPAN></DIV>
<DIV><SPAN class=601541415-10082006><FONT face=Arial color=#0000ff>The real
fix (or at least part of it) is a cheap plastic optical
fiber link. The folks at Smart-Fly (the obvious website) created one,
and the market didn't materialize. I have a prototype, but a 5V supply at
the ESC end will have to be created that runs from the big battery. Maybe
the microprocessor supply on the ESC can be tapped for the optical receiver.
The problem, even though all these ESCs are opto-isolated, is
that the ESC/servo lead is still an antenna that runs deep into enemy
territory, picking up motor and ESC induced crud and putting it
into the RX ground. That corrupts the receiver's measurement of the received
signal. Dave's ferrite donut helps this. The biggest sources are the
big battery leads, and the three motor wires. The big battery wires should
be twisted, or at lest tied together so that any AC current ripple in
those wires does not have a ! big loop antenna with which to braoadcast
magnetic noise fields. Those big capacitors on the input of the ESC do
not completely flatten the current coming from the batteries, and in
particular the big caps used are useless at several MegaHertz
. </FONT></SPAN></DIV>
<DIV><SPAN class=601541415-10082006><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV><SPAN class=601541415-10082006><FONT face=Arial color=#0000ff>The same
is true for the three motor leads: they have 35 volts of square wave AC with
lots of current. Both the electric and magnetic fields are considerable, but
if short and twisted or tied together, they become less effective radiators
of RF. OIf course, distance is king. The optical link woiuld then allow you
to keep any radio wiring far from the power system.</FONT></SPAN></DIV>
<DIV><SPAN class=601541415-10082006><FONT face=Arial
color=#0000ff></FONT></SPAN> </DIV>
<DIV><SPAN class=601541415-10082006><FONT face=Arial color=#0000ff>An
electronics hobbyist could build a cheap fiber link with maybe $20 in parts
from Digi-Key. </FONT></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>-----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 11:04
AM<BR><B>To:</B> NSRCA Mailing List<BR><B>Subject:</B> Re:
[NSRCA-discussion] ESC and RX intereference<BR><BR></FONT></DIV>
<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 wil 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. ! Since s
witching to the DC RX I've never had a moment of h old. <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 Castl! e
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>> >>fi! ne unti l I got to the horizontal 8. !
Just past the middle of the first <BR>> >>loop down, the moto r
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 motor was back ! 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
Du al 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>>
_______________________________________________ <BR>>
NSRCA-discussion mailing list <BR>> NSRCA-discussion@lists.nsrca.org
<BR>> http://lists.nsrca.org/mailman/listinfo/nsrca-discussion
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