I may be overthinking it just a tad, too. I just cant seem to focus my skills in one area, and thats my real problem. I like all of it.
Just like in ex motors, you solve a problem, but affect other things you may be unaware your changing. Engineering always has its moving targets. Thanks, i will keep it simple and run twisted pairs. its what i have too. I have decided to go ahead and solder contact pin to the wires, it will just be cleaner, i am always afraid of the stray strand crossing terminals on me. http://www.alliedelec.com/search/productdetail.aspx?SKU=70083101 http://www.alliedelec.com/search/productdetail.aspx?SKU=70099258#tab=overview I can use some heat shrink and have a nice taylored and clean harness. Clay On Wed, Mar 27, 2013 at 2:00 PM, w9ya <[email protected]> wrote: > Perhaps I should explain this a bit further.... > > R.F. energy travels along the surface of conductors. Shields have two > surfaces where R.F. energy can travel whereas the simple conductor has > only one such surface. The "second" surface of shields not properly > accounted for is where "problems" often reside. > > There are whole chapters of engineering text books devoted to this > subject and this is merely a short and simple set of email ramblings, > but rest assured that shielding can be a real pain in your rear for > the reason touched upon in these emails. And the complex impedance > presented at any specific point along the shield and the calculations > involved to properly consider these values are not so simple a matter > as the other, un-shielded, scenario where one merely shunts r.f. > energy at the connection points of a simple un-shielded twisted pair. > > Very best regards; > > - Bob Finch > > On Wed, Mar 27, 2013 at 10:32 AM, w9ya <[email protected]> wrote: > > I'd have to look at the circuit in more detail to be assured of this > > v/v the altus metrum fligh units, but generally the need for shielding > > in the wiring looms is over-rated and further the shielding can act > > like a parasitic antenna where twisted (specifically by pairs) wiring > > would not otherwise be a problem. > > > > Very best regards; > > > > - Bob Finch > > > > On Wed, Mar 27, 2013 at 10:28 AM, w9ya <[email protected]> wrote: > >> Um....I use the following; > >> > >> 1 - Properly routed and supported *stranded* wiring. i.e. NO > >> unsupported flexing of the wiring loom. > >> > >> 2 - Tinned (with solder of course) wiring is specifically indicated. > >> It will not release from under the screw terminal when the terminal is > >> properly tightened and supported. > >> > >> 3 - Double check the connections before each flight; by making sure > >> the wiring and screw are snug AND that the wiring is still routed and > >> supporteed correctly. > >> > >> YMMV of course but I preclude intermittent continuity issues resulting > >> from the lack of a gas tight ferrule connection. > >> > >> Very best regards; > >> > >> - Bob Finch > >> > >> > >> > >> On Wed, Mar 27, 2013 at 8:16 AM, Thomas Müller > >> <[email protected]> wrote: > >>> If you like to attached stranded wire to screw terminals you should > crimp > >>> the ends in a ferrule. Tin soldering is not a good idea since the thin > is > >>> pretty soft and flowable which might lose the connection. > >>> > >>> > >>> > >>> Thomas > >>> > >>> > >>> > >>> Von: [email protected] > >>> [mailto:[email protected]] Im Auftrag von Clay & Carly > >>> Dunsworth > >>> Gesendet: Mittwoch, 27. März 2013 14:59 > >>> An: Altus Metrum > >>> Betreff: Re: [altusmetrum] wires > >>> > >>> > >>> > >>> I have always steered away from the solid core. Most of the time where > >>> space isnt critical ive used machine tool wire, but doesnt work with > the > >>> "smallness" of the Altus Metrum products.(16ga). I bought some > smaller 26ga > >>> stranded, becuase another altimeter i have, the MFG suggest 26ga > stranded as > >>> the "smallest" wire that would be safe. this was after I discovered > blue > >>> color on the copper of the ematch leads. (now i suspect chemical > reaction of > >>> the bare copper, oily fingers, and BP residue.) Oddly its almost too > big for > >>> the TM i have. > >>> > >>> > >>> > >>> I have never tinned the ends of my wires, but the belkin cable i cut > up the > >>> other day suprised me that the wires were stranded copper, and seemed > >>> suitable for this. I always envisioned they were like old telephone > cable > >>> with that fiberstuff, that would be unsuitable. Maybe with this small > of a > >>> gage i should solder tin the ends for added reliablity? > >>> I have litterally hundreds of feet of the stuff, and would be a > "freebe" for > >>> the rest of my av-building life. > >>> > >>> > >>> > >>> Clay > >>> > >>> I guess thats why we test! > >>> > >>> On Tue, Mar 26, 2013 at 10:41 PM, Michael Stephens < > [email protected]> > >>> wrote: > >>> > >>> My only worry would be that solid core wire doesn't like vibration > very much > >>> but stranded wire doesn't do well in screw terminals. I would think it > could > >>> definitely handle the voltage, especially since its such low duty > cycle. > >>> > >>> On Mar 26, 2013 8:16 PM, "Clay & Carly Dunsworth" < > [email protected]> > >>> wrote: > >>> > >>> Anyone use cat5e cable for thier avionics bay? > >>> > >>> Making a small launcher for the kids, i noticed the 4 twisted pair i > >>> have would be a good match for my bay? > >>> > >>> Its good for things like telephones and data signal, but what about > >>> ematch voltage? > >>> thinking the sheething and twisted pair may be good at RF shielding? > >>> Clay > >>> > >>> _______________________________________________ > >>> altusmetrum mailing list > >>> [email protected] > >>> http://lists.gag.com/mailman/listinfo/altusmetrum > >>> > >>> > >>> _______________________________________________ > >>> altusmetrum mailing list > >>> [email protected] > >>> http://lists.gag.com/mailman/listinfo/altusmetrum > >>> > >>> > >>> > >>> > >>> _______________________________________________ > >>> altusmetrum mailing list > >>> [email protected] > >>> http://lists.gag.com/mailman/listinfo/altusmetrum > >>> > _______________________________________________ > altusmetrum mailing list > [email protected] > http://lists.gag.com/mailman/listinfo/altusmetrum >
_______________________________________________ altusmetrum mailing list [email protected] http://lists.gag.com/mailman/listinfo/altusmetrum
