[NSRCA-discussion] RX choices
Dean Pappas
d.pappas at kodeos.com
Fri Sep 15 07:31:55 AKDT 2006
It's even wierder than that, and I am just too busy right now.
Later, I promise,
Dean
Dean Pappas
Sr. Design Engineer
Kodeos Communications
111 Corporate Blvd.
South Plainfield, N.J. 07080
(908) 222-7817 phone
(908) 222-2392 fax
d.pappas at kodeos.com
-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of
dwaynenancy
Sent: Friday, September 15, 2006 11:29 AM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] RX choices
Yep, she had a patent on the method. It seems she got the idea while
playing a piano. Dwayne
Dean Pappas wrote:
> Even the latest Spektrum DSS system is just narrow-band FM!
> How that works is an even better story, especially because it involves
> Hedi Lamarr!
> later,
> Dean
>
>
> Dean Pappas
> Sr. Design Engineer
> Kodeos Communications
> 111 Corporate Blvd.
> South Plainfield, N.J. 07080
> (908) 222-7817 phone
> (908) 222-2392 fax
> d.pappas at kodeos.com
>
> -----Original Message-----
> *From:* nsrca-discussion-bounces at lists.nsrca.org
> [mailto:nsrca-discussion-bounces at lists.nsrca.org]*On Behalf Of
> *Bob Richards
> *Sent:* Friday, September 15, 2006 11:17 AM
> *To:* NSRCA Mailing List
> *Subject:* Re: [NSRCA-discussion] RX choices
>
> John,
>
> 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).
>
> 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.
>
> 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.
>
> Bob R.
>
>
> */John Ferrell <johnferrell at earthlink.net>/* wrote:
>
> Although I fly Futaba I have a lot of respect for the JR receiver
> technology. It is the only thing new in receiver design other
> than the
> Futaba synthesized receiver since the early 1950's. The
> technology made the
> change to solid state but that was not taking advantage of any
> new design.
>
> I can assure you that Ham radio receivers have made steady
> progress during
> that time even as prices came down.
>
> The bigger problem is that we have no idea about the real
> specs on these
> receivers. The maintenance information is held very close and
> parts even
> closer. We have no idea how long it takes to cycle in and out
> of fail safe
> let alone any control over it. In fact we have no real
> indicator of failure
> thresholds. George Steiner has done a lot of work in this area
> such as his
> "missing frames" detector but his work has been hampered by
> lack of
> published specs by the manufactures with PCM.
>
> I had hopes of improvements when HiTec swallowed Multiplex but
> it seems to
> me they have only used the acquisition to leverage their
> efforts to become
> another Futaba/JR/Airtronix.
>
> We have not been demanding customers and we have put way too
> much faith in
> letting the suppliers make decisions for us!
> John Ferrell W8CCW
> "My Competition is not my enemy"
> http://DixieNC.US
>
> ----- Original Message -----
> From: "Ed Alt"
> To:
> Sent: Thursday, September 14, 2006 5:02 PM
> Subject: Re: [NSRCA-discussion] RX choices
>
>
> >
> > Yep, I've been flying JR single conversion ABC&W sine the
> late 90's in
> > quite
> > a number of different locations around the country and have
> never, not
> > once
> > had the slightest indication of a problem. Lot's of time
> with ignition
> > systems too. Must be some other cheesy single conversion
> receiver?
> >
> > Ed
> >
>
>
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