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<DIV><FONT face=Arial size=2>Any RF link can be interfered with, marketing hype
aside. The DSS systems will primarily offer protection from each other,
which is definitely a good thing. It's not going to be completely
effective at rejecting other sources of RF on the same channels that arrive
after initial open channel has completed at startup. Not everyone plays by
the same rules from a protocol observance standpoint. Net-net, they won't
be immune to intererence, although they may be a significant improvement from
what we have today. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Again, what I am proposing is simple to do and
could be incorprated in any radio technology. For that matter, it could
even be a pot (potentiometer replacement) to an unused extra channel if older
transmitters needed the feature. A small protocol module add-in takes over
the function of a pot, could be swapped by a skilled modeler or better yet,
Radio South, Horzon/Hobby Services etc. Bingo, you have your failsafe
protocol ready to interface with 3rd party kill switches, audible alert speakers
etc. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ed</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=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 3:19 PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Two
killed by model airplane</DIV>
<DIV><BR></DIV>Once they perfect the DSS systems we may see most of these
problems go away. It is my understanding that most of the interference
we experience is significantly lower in frequency than the DSS channels (2.4
GHz).<BR><BR>
<DIV><SPAN class=gmail_quote>On 5/21/06, <B class=gmail_sendername>Ed Alt</B>
<<A href="mailto:ed_alt@hotmail.com">ed_alt@hotmail.com</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><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>
<DIV><SPAN class=sg>
<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></SPAN></DIV>
<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=q>
<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=rcaerobob@cox.net
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:rcaerobob@cox.net" target=_blank>Bob Pastorello</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></SPAN></DIV>
<DIV><SPAN class=e id=q_10b584dfa40a32ed_4>
<DIV
style="FONT: 10pt arial; font-size-adjust: none; font-stretch: normal"><B>Sent:</B>
Sunday, May 21, 2006 1:48 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><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
onclick="return top.js.OpenExtLink(window,event,this)"
href="http://www.rcaerobats.net" target=_blank>www.rcaerobats.net</A><BR><A
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:rcaerobob@cox.net" target=_blank>rcaerobob@cox.net</A></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(0,0,0) 2px solid; MARGIN-RIGHT: 0px">
<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=brett.terry@gmail.com
onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:brett.terry@gmail.com" target=_blank>brett terry</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 21, 2006 12:39 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>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 onclick="return top.js.OpenExtLink(window,event,this)"
href="mailto:edbon85@charter.net"
target=_blank>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>
<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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