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<DIV><SPAN class=103563315-18122006><FONT face="Lucida Sans">Thanks for the
info, Jim.</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
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>J.Oddino<BR><B>Sent:</B> Sunday, December 17, 2006 5:52 PM<BR><B>To:</B>
NSRCA Mailing List<BR><B>Subject:</B> [NSRCA-discussion] 2.4
Ghz<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2>I flew the Dx7 on Thursday and it felt pretty
good. It was in a Dog House Extreme with marginal servos but still had a
very nice feel. I took it way up and out so we could barely see it and
had no problems.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Today I ran a few tests. Following are some
results and my comments:</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>1) The update rate, that is, the rate at which
the servos get new information was about 45 Hz or every 22 milleseconds.
This is a little slower than most modern day systems.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>2) The resolution less the servo, that is, the
minimum change in the pulse width to the servo, was 1.0 microsecond.
This is better than any system I have measured. When I connected one
of my elevators with a good JR digital servo it was extremely accurate and
neutralized perfectly as far as I could see. This was confirmed by
measuring the pulse width on a scope scaled to one microsecond per cm.
This also says the mechanics of the transmitter gimbal are not creating an
error in commanding neutral.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>3) The change in pulse width per click of the
digital trim was 3 to 4 microseconds which is not good. The basic system
is a 1024, 1024 steps from lock to lock, but you can only trim it as if
it were a 256. To me it is setting the trim that requires the
best resolution. We could fly with a 256 system as long as we could trim
to 1 in 1024. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>4) An interesting thing was the dither on the
pulse width of .4 to .8 microseconds. I assume this was done on purpose
because there should be no pulse jitter in a digital system. I'm
wondering if this can contribute to the good feel when flying. Any
opinions out there?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>This system looks like a very good value and the
big boys better get a spread spectrum system out if they want to sell systems
in this price range.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Jim O</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV></BLOCKQUOTE></BODY></HTML>