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="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<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="border-left: 2px solid rgb(0, 0, 0); padding-right: 0px; padding-left: 5px; margin-left: 5px; margin-right: 0px;"></blockquote></div><div><span class="q">
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">----- Original Message ----- </div>
<div style="background: rgb(228, 228, 228) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
<b>From:</b>
<a title="rcaerobob@cox.net" href="mailto:rcaerobob@cox.net" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">Bob Pastorello</a>
</div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>To:</b> <a title="nsrca-discussion@lists.nsrca.org" href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
NSRCA Mailing List</a> </div></span></div><div><span class="e" id="q_10b584dfa40a32ed_4">
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Sent:</b> Sunday, May 21, 2006 1:48 PM
</div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; 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 href="http://www.rcaerobats.net" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">www.rcaerobats.net</a><br><a href="mailto:rcaerobob@cox.net" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
rcaerobob@cox.net</a></div>
<blockquote style="border-left: 2px solid rgb(0, 0, 0); padding-right: 0px; padding-left: 5px; margin-left: 5px; margin-right: 0px;">
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">----- Original Message ----- </div>
<div style="background: rgb(228, 228, 228) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
<b>From:</b>
<a title="brett.terry@gmail.com" href="mailto:brett.terry@gmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">brett
terry</a> </div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>To:</b> <a title="nsrca-discussion@lists.nsrca.org" href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
NSRCA Mailing List</a> </div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Sent:</b> Sunday, May 21, 2006 12:39
PM</div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; 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 href="mailto:edbon85@charter.net" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">edbon85@charter.net</a>> wrote:</span>
<blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<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="border-left: 2px solid rgb(0, 0, 0); padding-right: 0px; padding-left: 5px; margin-left: 5px; margin-right: 0px;"></blockquote></div>
<div><span>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">-----
Original Message ----- </div>
<div style="background: rgb(228, 228, 228) none repeat scroll 0% 50%; -moz-background-clip: -moz-initial; -moz-background-origin: -moz-initial; -moz-background-inline-policy: -moz-initial; font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
<b>From:</b>
<a title="mups1953@yahoo.com" href="mailto:mups1953@yahoo.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">mike mueller</a> </div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>To:</b>
<a title="nsrca-discussion@lists.nsrca.org" href="mailto:nsrca-discussion@lists.nsrca.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">NSRCA Mailing
List</a> </div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; font-size-adjust: none; font-stretch: normal;"><b>Sent:</b>
Sunday, May 14, 2006 11:10 PM </div>
<div style="font-family: arial; font-style: normal; font-variant: normal; font-weight: normal; font-size: 10pt; line-height: normal; 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 href="mailto:seefo@san.rr.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">seefo@san.rr.com</a>></i></b> wrote: </div>
<blockquote style="border-left: 2px solid rgb(16, 16, 255); padding-left: 5px; margin-left: 5px;">
<div>
<div><font color="navy" face="Arial" 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 color="navy" face="Arial" size="2"><span style="font-size: 10pt; color: navy; font-family: Arial;"></span></font> </div>
<div><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; color: navy; font-family: Arial;">-Doug</span></font></div>
<div><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; color: navy; font-family: Arial;"></span></font> </div>
<div><font color="navy" face="Arial" size="2"><span style="font-size: 10pt; color: navy; font-family: Arial;"></span></font> </div>
<div><font color="navy" face="Arial" 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" size="2" width="100%">
</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 href="mailto:nsrca-discussion-bounces@lists.nsrca.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">nsrca-discussion-bounces@lists.nsrca.org</a> [mailto:<a href="mailto:nsrca-discussion-bounces@lists.nsrca.org" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
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 href="http://english.mti.hu/default.asp?menu=1&theme=2&cat=25&newsid=219887" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">
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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http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</a></blockquote><br></span></div>
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