[NSRCA-discussion] RX choices

[dwaynenancy]

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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>
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