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<DIV><FONT face=Arial size=2>Guys,</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>I seem to remember reading about a system that once
you locked a channel, between your transmitter and receiver, the receiver didn't
respond to any transmitter except yours. I'm assuming that this
system uses the "transmitter recognition" technology we all would like to
see.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Ken</FONT></DIV>
<BLOCKQUOTE dir=ltr
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=ed_alt@hotmail.com href="mailto:ed_alt@hotmail.com">Ed Alt</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, March 22, 2005 1:48
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [SPAM] Re: JR 10SX</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial size=2>John:</FONT></DIV>
<DIV><FONT face=Arial size=2>I think that they used to call that Kraft with
the syntesised RF module "dial-a-crash". Actually, the technology for
synthesising 50 channels is no big deal, PLL circuits have been used to do
this for decades. Back in the early 80's I did my senior year
electronics project by taking an Ace Silver 7 receiver, disabled the local
oscillator and injected the output of a PLL local oscillator of my own.
It was just a bench prototype for a grade, clunky to look at and with 7 seg
LED readouts to display the channel it was on, but it worked. I got alot
of curious looks from the class when I hauled in a Kraft single stick, a
Heathkit GD-19 and a Futaba FG series radio on different channels to
demonstrate that it worked to the Prof. Nowadays, this stuff can
done in software with DSP technology. I can see the wheels turning in
your head already! :)</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Spread Spectrum would be one way to go, or maybe
something using WiMax technology, whenever that shakes out. Eric is
right, our technology for the RF link is totally archaic. Nice that we
have good, reliable "narrow band" stuff now, but it could be much
better.</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>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=jpavlick@idseng.com href="mailto:jpavlick@idseng.com">John
Pavlick</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, March 22, 2005 1:10
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> RE: JR 10SX</DIV>
<DIV><BR></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=860491605-22032005>Yeah, I agree with Eric. As far as I'm
concerned, the new Futaba radio (14MZ) is really nice looking, and of course
I wouldn't mind having one BUT since I don't fly the really big stuff where
14 channels is a big help (multiple servos on each control surface), it
wouldn't be much of an improvement over my 9ZAP. It seems like the RF
section is always an after-thought. I remember when all the "new"
frequencies were being discussed (pre 1991 times). One of the ideas behind
getting all the new frequencies was to reduce the chance of someone being on
your frequency. I always thought a better approach would have been to make
everything with synthesized RF decks. Since the plan we adopted ended up
making a lot of otherwise good equipment obsolete anyway, I don't see
what the problem would have been. We wouldn't need as many channels
that way either (more room for other stuff). If you can select your
frequency, rather than just increase the odds of not being on someone else's
frequency, then the real problem is solved. I seem to recall that Kraft had
synthesized RF and "narrow band" FM equipment before anyone
else. Almost every major radio manufacturer has some type of
synthesized RF deck today.</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN
class=860491605-22032005> If you add the synthesized RF deck to a
digital encoding "code hopping" transmitter and receiver you have a
good solution to our newest problem. As long as the receiver isn't swamped
by a very high output transmitter, this is safer than what we have now. A
code hopping system uses a digital encoding scheme in addition to the base
frequency. The "digital key" changes when the system powers up. You don't
even know it's happening. Even if someone is transmitting on the same
frequency, if the "keys" don't match the receiver won't respond. That's over
simplifying a bit but that's the basic idea. There's more to the link than
just the RF frequency, which as we all know is not always exclusive. Clothes
pins with channel numbers are not exactly a foolproof method of securing
your frequency. This kind of stuff is in $40.00 cordless phones and garage
door openers - remember the old garage door openers that used to open
for "no reason"? How do you think they fixed that? Why can't this technology
be used in a $2000.00 radio? If we keep building bigger and bigger airplanes
and controlling them with what is basically outdated technology, it's only a
matter of time...</SPAN></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2><SPAN class=860491605-22032005>
<P><FONT size=2>John Pavlick<BR><A href="http://www.idseng.com/"
target=_blank>http://www.idseng.com</A><BR> </FONT>
</P></SPAN></FONT></DIV>
<DIV><SPAN class=860491605-22032005></SPAN><FONT face=Tahoma><FONT
size=2><SPAN class=860491605-22032005><FONT face=Arial
color=#0000ff></FONT></SPAN></FONT></FONT> </DIV>
<DIV><FONT face=Tahoma><FONT size=2><SPAN
class=860491605-22032005> </SPAN>-----Original
Message-----<BR><B>From:</B> discussion-request@nsrca.org
[mailto:discussion-request@nsrca.org]<B>On Behalf Of </B>Grow
Pattern<BR><B>Sent:</B> Monday, March 21, 2005 11:48 PM<BR><B>To:</B>
discussion@nsrca.org<BR><B>Subject:</B> Re: JR 10SX<BR><BR></DIV></FONT>
<BLOCKQUOTE dir=ltr
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px"></FONT>
<DIV><FONT face=Arial size=2>Bill, the update to the 10SX (actually a
10SXII) was the digital trim 10X. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Is the 10X what you meant to
say?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>In general terms I don't intend to buy
another radio, of any brand, until they fix the weakness of our RF link to
the plane. We can all still be radio-shot-down far too
easily.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Regards,</FONT></DIV>
<DIV><FONT face=Arial size=2><BR>Eric.</FONT></DIV>
<BLOCKQUOTE dir=ltr
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=flyinbill1@bellsouth.net
href="mailto:flyinbill1@bellsouth.net">William C. Harden</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=discussion@nsrca.org
href="mailto:discussion@nsrca.org">discussion@nsrca.org</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Monday, March 21, 2005 9:42
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> JR 10SX</DIV>
<DIV><BR></DIV>
<DIV class=Section1>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Now that JR has come to
market with their new 9303 radio, does JR intend to update their 10SX
radio?<SPAN style="mso-spacerun: yes"> </SPAN>If so, when will the
new radio be available???<SPAN style="mso-spacerun: yes">
</SPAN>Just curious.<o:p></o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial"><o:p> </o:p></SPAN></FONT></P>
<P class=MsoNormal><FONT face=Arial size=2><SPAN
style="FONT-SIZE: 10pt; FONT-FAMILY: Arial">Bill
<o:p></o:p></SPAN></FONT></P></DIV></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>