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<DIV><FONT face=Arial size=2>Dean,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I have never heard anyone explain the Spectrum
system in a manner that made sense. Sounds as though you might have some
insight. Can you point me to something to fill in the blanks?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT face=Arial size=2>Jim O</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=d.pappas@kodeos.com href="mailto:d.pappas@kodeos.com">Dean Pappas</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> Friday, September 15, 2006 8:29
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] RX
choices</DIV>
<DIV><BR></DIV>
<DIV><SPAN class=113102815-15092006><FONT face=Arial color=#0000ff size=2>Even
the latest Spektrum DSS system is just narrow-band FM!</FONT></SPAN></DIV>
<DIV><SPAN class=113102815-15092006><FONT face=Arial color=#0000ff size=2>How
that works is an even better story, especially because it involves Hedi
Lamarr!</FONT></SPAN></DIV>
<DIV><SPAN class=113102815-15092006><FONT face=Arial color=#0000ff
size=2>later,</FONT></SPAN></DIV>
<DIV><SPAN class=113102815-15092006><FONT face=Arial color=#0000ff
size=2>Dean</FONT></SPAN></DIV>
<DIV> </DIV>
<P><FONT face="Times New Roman">Dean Pappas</FONT> <BR><FONT
face="Times New Roman">Sr. Design Engineer</FONT> <BR><FONT
face="Times New Roman">Kodeos Communications</FONT> <BR><FONT
face="Times New Roman">111 Corporate Blvd.</FONT> <BR><FONT
face="Times New Roman">South Plainfield, N.J. 07080</FONT> <BR><FONT
face="Times New Roman">(908) 222-7817 phone</FONT> <BR><FONT
face="Times New Roman">(908) 222-2392 fax</FONT> <BR><FONT
face="Times New Roman"><A
href="mailto:d.pappas@kodeos.com">d.pappas@kodeos.com</A></FONT> </P>
<BLOCKQUOTE>
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B>
nsrca-discussion-bounces@lists.nsrca.org
[mailto:nsrca-discussion-bounces@lists.nsrca.org]<B>On Behalf Of </B>Bob
Richards<BR><B>Sent:</B> Friday, September 15, 2006 11:17 AM<BR><B>To:</B>
NSRCA Mailing List<BR><B>Subject:</B> Re: [NSRCA-discussion] RX
choices<BR><BR></FONT></DIV>
<DIV>John,</DIV>
<DIV> </DIV>
<DIV>I'm not surprised the manufacturers keep the PCM information (like
packet specification, operating parameters, etc) private. For one,
that information could be considered a trade secret and they would not want
competitors to know about it. On the other hand, they might be worried that
a competitor would examine the data and discover some flaw or limitation in
the technology and then publicly announce this fact. Still, I'm surprised no
one has reverse engineered the PCM data stream from either JR or Futaba
(maybe someone has, I just don't know).</DIV>
<DIV> </DIV>
<DIV>I'll take some issue with what you have said regarding the technology
not changing since the '50s. I believe the '50s saw super-regen systems?
After that, there was (is) super-heterodyne systems. Then, dual conversion
and narrow band systems, as well as FM instead of AM. PCM was added
(really nothing to do with the RF, just a data link added to the existing RF
systems). I think the systems today are more reliable than in the 70s when I
first started, and they are having to do this in a much more polluted RF
environment.</DIV>
<DIV> </DIV>
<DIV>Still, I agree with you that, as a group (modelers in general), we have
not done a good job demanding more from the manufacturers. For most, cost
seems to be the big issue, but we don't look at cost in terms of the big
picture, like "a cheap receiver will cost you a lot AFTER you buy it".
Those of us that are competitors do a better job demanding more, IMHO.</DIV>
<DIV> </DIV>
<DIV>Bob R.</DIV>
<DIV><BR><BR><B><I>John Ferrell <johnferrell@earthlink.net></I></B>
wrote:</DIV>
<BLOCKQUOTE class=replbq
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">Although
I fly Futaba I have a lot of respect for the JR receiver <BR>technology.
It is the only thing new in receiver design other than the <BR>Futaba
synthesized receiver since the early 1950's. The technology made the
<BR>change to solid state but that was not taking advantage of any new
design.<BR><BR>I can assure you that Ham radio receivers have made steady
progress during <BR>that time even as prices came down.<BR><BR>The bigger
problem is that we have no idea about the real specs on these
<BR>receivers. The maintenance information is held very close and parts
even <BR>closer. We have no idea how long it takes to cycle in and out of
fail safe <BR>let alone any control over it. In fact we have no real
indicator of failure <BR>thresholds. George Steiner has done a lot of work
in this area such as his <BR>"missing frames" detector but his work has
been hampered by lack of <BR>published specs by the manufactures with
PCM.<BR><BR>I had hopes of improvements when HiTec swallowed Multiplex but
it seems to <BR>me they have only used the acquisition to leverage their
efforts to become <BR>another Futaba/JR/Airtronix.<BR><BR>We have not been
demanding customers and we have put way too much faith in <BR>letting the
suppliers make decisions for us!<BR>John Ferrell W8CCW<BR>"My Competition
is not my enemy"<BR>http://DixieNC.US<BR><BR>----- Original Message -----
<BR>From: "Ed Alt" <ED_ALT@HOTMAIL.COM><BR>To:
<NSRCA-DISCUSSION@LISTS.NSRCA.ORG><BR>Sent: Thursday, September 14, 2006
5:02 PM<BR>Subject: Re: [NSRCA-discussion] RX
choices<BR><BR><BR>><BR>> Yep, I've been flying JR single conversion
ABC&W sine the late 90's in <BR>> quite<BR>> a number of
different locations around the country and have never, not <BR>>
once<BR>> had the slightest indication of a problem. Lot's of time with
ignition<BR>> systems too. Must be some other cheesy single conversion
receiver?<BR>><BR>>
Ed<BR>><BR><BR><BR>_______________________________________________<BR>NSRCA-discussion
mailing
list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion<BR></BLOCKQUOTE><BR></BLOCKQUOTE>
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