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<DIV><FONT face=Arial size=2>Bob:</FONT></DIV>
<DIV><FONT face=Arial size=2>Ther are kill switches that can be set to work with
a pre-set failsafe output. I think the problem with what you wuold like to
see is that without some failsafe response from the receiver, it's hard to
predict what you will get during interference. I don't think it's unsolvable
though. If you used a spare channel for the kill switch, even a PPM
receiver solution could work. A partially reliable solution would require
either a PCM or PPM receiver to reliably hold one position and anything outside
a narrow tolerance range would trigger the cutoff. That's easy to
do. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Here's a better solution, but it requires some
cooperation from the radio manufacturers. What is really needed is a
so-called "keep-alive" signal sequence from the transmitter. Veryone
should standardize on the same, exact thing in a case like this.
Keep-alives are used all the time in computing gear, to help "harden" the
solution for failure detection/recovery etc. It's as old as dirt, used in
Telecom, other mission critical stuff for medical, military etc. The idea
in its simplest form is that a cyclic signal with known attributes is sent to
the "target" (the kill switch for us). If the target doesn't get what it
expects within it's timeout interval, it can initiate whatever action is deemed
necessary. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>This can be far superior than just camping on a
simple steady pulse position value, since you can make the probability of
continuously receiving a "good" sequence from a bad RF link astronomically
high. In other words, you can set the level of signal link deterioration
before acting on it to something very fleeting or make it take longer to detect
if you want a higher certainty that it is time to act on a bad link. So
you could make the "stay running" sequence a known series of varying pulse
widths, even using varying timing between the varying widths. None of this
is especially difficult to do, nor should it be very expensive. On top of
this, you could een couple the engine kill response to a loud piezo speaker and
chirp out a warning - "Incoming". Make it an industry standard chirp
sequence and it wuold be an unmistakable sign that a model was no longer under
control of a good link. Then, any 3rd party devices that want to work with
this have to get on board and be redesigned to recognize the standard LOS (loss
of signal) protocol. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ed</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=rcaerobob@cox.net href="mailto:rcaerobob@cox.net">Bob Pastorello</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> Sunday, May 21, 2006 1:48 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Two
killed by model airplane</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>I have oft wondered if an "ignition CUT off" that
sensed loss of RX decoder outputs that would KILL the motor wouldn't
help. It would at least mitigate the energy of the impact. Never
heard of one out there that works exactly like I'm describing, and it would
probably only be effective for gassers at this stage, but it may REDUCE the
degree of injury.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I fear full DUAL RF_Link redundancy in our
future....</FONT></DIV>
<DIV><BR>Bob Pastorello<BR><A
href="http://www.rcaerobats.net">www.rcaerobats.net</A><BR><A
href="mailto:rcaerobob@cox.net">rcaerobob@cox.net</A></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=brett.terry@gmail.com href="mailto:brett.terry@gmail.com">brett
terry</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> Sunday, May 21, 2006 12:39
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Two
killed by model airplane</DIV>
<DIV><BR></DIV>Lest we forget, or become careless because of the relative
size of our planes to the 50% scale Pitts that killed the people in Hungary,
remember a young girl was killed in China a few weeks ago by a 21-size
trainer. <BR><BR>Like you said, it is only a matter of time. We
must always be wary of the danger, and make sure everybody at our fields
also follow safe practices.<BR><BR><BR>
<DIV><SPAN class=gmail_quote>On 5/21/06, <B class=gmail_sendername>Ed
Miller</B> <<A
href="mailto:edbon85@charter.net">edbon85@charter.net</A>> wrote:</SPAN>
<BLOCKQUOTE class=gmail_quote
style="PADDING-LEFT: 1ex; MARGIN: 0pt 0pt 0pt 0.8ex; BORDER-LEFT: rgb(204,204,204) 1px solid">
<DIV>
<DIV bgcolor="#ffffff">
<DIV>Having just spent a week at the Joe Nall event it is clear to me it
is only a matter of time before a similar tragedy happens here in the US.
</DIV>
<DIV>Ed M.</DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(0,0,0) 2px solid; MARGIN-RIGHT: 0px"></BLOCKQUOTE></DIV>
<DIV><SPAN class=e id=q_10b57275d3bf6378_1>
<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal">-----
Original Message ----- </DIV>
<DIV
style="BACKGROUND: rgb(228,228,228) 0% 50%; FONT: 10pt arial; font-size-adjust: none; font-stretch: normal; moz-background-clip: -moz-initial; moz-background-origin: -moz-initial; moz-background-inline-policy: -moz-initial"><B>From:</B>
<A title=mups1953@yahoo.com
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:mups1953@yahoo.com" target=_blank>mike mueller</A> </DIV>
<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal"><B>To:</B>
<A title=nsrca-discussion@lists.nsrca.org
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:nsrca-discussion@lists.nsrca.org" target=_blank>NSRCA Mailing
List</A> </DIV>
<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal"><B>Sent:</B>
Sunday, May 14, 2006 11:10 PM </DIV>
<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal"><B>Subject:</B>
Re: [NSRCA-discussion] Two killed by model airplane</DIV>
<DIV><BR></DIV>
<DIV> Sad news,it should remind us that were only a serious
accident away from potentially being grounded. We can all say that we fly
safe and yada yada yada but if the radio fails it could be a disaster. Man
I hope this doesn't happen again. I once witnessed a young girl
getting hit by a plane in the 70's and it still haunts me.</DIV>
<DIV>--Mike<BR><B><I>Doug Cronkhite <<A
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:seefo@san.rr.com"
target=_blank>seefo@san.rr.com</A>></I></B> wrote: </DIV>
<BLOCKQUOTE
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(16,16,255) 2px solid">
<DIV>
<DIV><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Yep.. 4 others
were injured. Looks like it was a 3W Pitts Model 12 that crashed. The
pilot was arrested by police at the scene..</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">-Doug</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </DIV>
<DIV><FONT face=Arial color=navy size=2><SPAN
style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial"></SPAN></FONT> </DIV>
<DIV>
<DIV style="TEXT-ALIGN: center" align=center><FONT
face="Times New Roman" size=3><SPAN style="FONT-SIZE: 12pt">
<HR align=center width="100%" SIZE=2>
</SPAN></FONT></DIV>
<DIV><B><FONT face=Tahoma size=2><SPAN
style="FONT-WEIGHT: bold; FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">From:</SPAN></FONT></B><FONT
face=Tahoma size=2><SPAN style="FONT-SIZE: 10pt; FONT-FAMILY: Tahoma">
<A onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:nsrca-discussion-bounces@lists.nsrca.org"
target=_blank>nsrca-discussion-bounces@lists.nsrca.org</A> [mailto:<A
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:nsrca-discussion-bounces@lists.nsrca.org"
target=_blank>nsrca-discussion-bounces@lists.nsrca.org</A>] <B><SPAN
style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Ed White<BR><B><SPAN
style="FONT-WEIGHT: bold">Sent:</SPAN></B> Sunday, May 14, 2006 7:50
PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B> NSRCA Mailing
List<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B>
[NSRCA-discussion] Two killed by model
airplane</SPAN></FONT></DIV></DIV>
<DIV><FONT face="Times New Roman" size=3><SPAN
style="FONT-SIZE: 12pt"></SPAN></FONT> </DIV>
<DIV style="MARGIN-BOTTOM: 12pt"><FONT face="Times New Roman"
size=3><SPAN style="FONT-SIZE: 12pt">Yikes.<BR><BR><A
onclick="return top.js.OpenExtLink(window,event,this)"
href="http://english.mti.hu/default.asp?menu=1&theme=2&cat=25&newsid=219887"
target=_blank>http://english.mti.hu/default.asp?menu=1&theme=2&cat=25&newsid=219887</A><BR><BR><BR><BR></SPAN></FONT></DIV></DIV>_______________________________________________<BR>NSRCA-discussion
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target=_blank>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</A></BLOCKQUOTE><BR></SPAN></DIV>
<DIV>
<P></P></DIV>
<DIV><SPAN class=e id=q_10b57275d3bf6378_3>
<HR SIZE=1>
Yahoo! Messenger with Voice. <A
onclick="return top.js.OpenExtLink(window,event,this)"
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