[NSRCA-discussion] RX choices

[brett terry]

"That's HEDLEY...!"

sorry, Blazing Saddles line.


On 9/15/06, Dean Pappas <d.pappas at kodeos.com> 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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