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<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></BODY></HTML>