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Ed:<br>
Do you not think that we will always be subject to interference as long
as we are "secondary" users? Admittedly, more could be done. <br>
As an aside: I fly frequently at a field that has a huge (2000 ft.
tall) antenna directly behind us. It is no more than 300 yds. away at
the flyers 6 o'clock position. Yet, even though pattern flyers won't
come and fly there, (probably because of the frightening specter of
that powerful antenna) folks fly there literally every day of the year
with no interference. I'm one of the frequent flyers. Unfortunately,
it seems that most of the pattern folks have just enough information to
be dangerous when they shun this field.. BTW: a check for interference
shows that there is less interference literally in the shadow of this
antenna, than there is at another local field, yet the other field,
which shows a higher level of "hash" is quite popular. Ignorance is
bliss.<br>
<br>
Bill Glaze<br>
<br>
Ed Alt wrote:<br>
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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> </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> </div>
<div><font face="Arial" size="2">Ed</font></div>
<div> </div>
<div> </div>
<div>----- Original Message ----- </div>
<blockquote
style="border-left: 2px solid rgb(0, 0, 0); padding-right: 0px; padding-left: 5px; margin-left: 5px; margin-right: 0px;"
dir="ltr">
<div
style="background: rgb(228, 228, 228) none repeat scroll 0%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: 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="jpavlick@idseng.com" href="mailto:jpavlick@idseng.com">John
Pavlick</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="discussion@nsrca.org" href="mailto:discussion@nsrca.org">discussion@nsrca.org</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>
Tuesday, March 22, 2005 1:10 AM</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: JR 10SX</div>
<div><br>
</div>
<div><font color="#0000ff" face="Arial" 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 color="#0000ff" face="Arial" 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 color="#0000ff" face="Arial" 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"></span></font></font> </div>
<div><font face="Tahoma"><font size="2"><span
class="860491605-22032005"> </span>-----Original Message-----<br>
<b>From:</b> <a class="moz-txt-link-abbreviated" href="mailto:discussion-request@nsrca.org">discussion-request@nsrca.org</a>
[<a class="moz-txt-link-freetext" href="mailto:discussion-request@nsrca.org">mailto:discussion-request@nsrca.org</a>]<b>On Behalf Of </b>Grow Pattern<br>
<b>Sent:</b> Monday, March 21, 2005 11:48 PM<br>
<b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:discussion@nsrca.org">discussion@nsrca.org</a><br>
<b>Subject:</b> Re: JR 10SX<br>
<br>
</font></font></div>
<font face="Tahoma"> </font>
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<div><font face="Arial" size="2">Bill, the update to the 10SX
(actually a 10SXII) was the digital trim 10X. </font></div>
<div> </div>
<div><font face="Arial" size="2">Is the 10X what you meant to say?</font></div>
<div> </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> </div>
<div><font face="Arial" size="2">Regards,</font></div>
<div><font face="Arial" size="2"><br>
Eric.</font></div>
<blockquote
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<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%; -moz-background-clip: initial; -moz-background-origin: initial; -moz-background-inline-policy: 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="flyinbill1@bellsouth.net"
href="mailto:flyinbill1@bellsouth.net">William C. Harden</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="discussion@nsrca.org"
href="mailto:discussion@nsrca.org">discussion@nsrca.org</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>
Monday, March 21, 2005 9:42 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>
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=""> </span>If so, when will the new radio be
available???<span style=""> </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>
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