[NSRCA-discussion] Digital Pug-In module

[Phil Spelt]

Bill,

The encoder circuitry (the part of the Tx that creates the pulse 
train and adjusts the pulse width according to stick/switch movement) 
is electronically independent of the of the rf circuitry that puts 
the pulse train onto the radio-frequency signal for transmission to 
the Rx.  There is, I think, no more problem with a 2.4 gig 
module/antenna than with a 72 MHz or 6-meter module.  The SS module 
has all the circuitry to use the 2.4-2.48GHz spectrum, including the 
antenna, which is "tuned" to the portion of the spectrum used.  As I 
understand it, there are some features of the Spektrum/JR SS-designed 
systems that do not translate to the module.  One of these is the 
changing of the pulse train so that in flaperon mode the flap pulse 
is not moved to be adjacent to the aileron pulse in the train.  If 
anyone can actually FEEL this difference, they are almost super-human 
on the Tx.  There are a couple of other features not present in the 
module that are in the full SS system, but I think they are minor.

Hope this is helpful...

At 10:31 AM 8/25/2009, you wrote:
>All:
>I bought from a pattern fllyer, a JR 9393 Transmitter and receiver 
>on 72 megs, with a frequency synthesizer,  While I do prefer to fly 
>on 6 meters, I thought I might use this transmitter with a 6 meter synthesizer.
>However, a good friend of mine suggested getting a conversion unit 
>and go directly to 2.4 Gig.  I know that it's  definitely the coming 
>thing, even though I've been satisfied with the older system.
>However, (and this is where my doubt comes in) I was told by a hobby 
>shop owner, that he "doesn't trust the 2.4 module, because, it's a 
>basically a converter, and because the entire system wasn't designed 
>to be used at 2.4 Gig to begin with, he doubts the plug-in module's 
>reliability or safety of flight."
>Any advice will be appreciated.
>
>Bill Glaze
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>NSRCA-discussion at lists.nsrca.org
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-->There are only two types of aircraft -- fighters and targets.

Phil Spelt, Webmaster & Past President, Knox County Radio Control Society, Inc.
        URL: http://www.kcrctn.com
AMA--1294,  Scientific Leader Member, SPA--177
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