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Lancair 360 Alternator field wire

 
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n4zq(at)verizon.net
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PostPosted: Thu Oct 02, 2014 5:39 am    Post subject: Lancair 360 Alternator field wire Reply with quote
My alternator field wire connects to the LR3C and at the moment, this wire runs in close proximity to sensor wires (EGT,CHT,FF, etc) and I’m getting some erratic indications on the MVP-50. With the alternator off, everything is quiet. So I’m wondering what should be the minimum distance between the alternator field wire and the other sensor wires? Also, the LR3C is supposed to be linear and quiet, but would there be any benefit to locating an electrolytic capacitor between terminals 4 and 7?

Thanks,

Angier Ames
N4ZQ

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jluckey(at)pacbell.net
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PostPosted: Thu Oct 02, 2014 6:38 am    Post subject: Lancair 360 Alternator field wire Reply with quote
Angier,

The hypothesis is that noise on the field wire is interfering w/ instrumentation. I agree w/ you that it seems a little odd considering, as you point out that "... the LR3C is supposed to be linear and quiet.." and that the max current it handles is around an amp.
In an effort to isolate some variables, is it practical to disconnect the existing field wire and route a temporary one away from the sensors and perform your tests again?


-Jeff


On Thursday, October 2, 2014 6:37 AM, "Greenbacks, UnLtd." <n4zq(at)verizon.net> wrote:
--> AeroElectric-List message posted by: "Greenbacks, UnLtd." <n4zq(at)verizon.net (n4zq(at)verizon.net)>My alternator field wire connects to the LR3C and at the moment, this wire runs in close proximity to sensor wires (EGT,CHT,FF, etc) and I’m getting some erratic indications on the MVP-50. With the alternator off, everything is quiet. So I’m wondering what should be the minimum distance between the alternator field wire and the other sensor wires? Also, the LR3C is supposed to be linear and quiet, but would there be any benefit to locating an electrolytic capacitor between terminals 4 and 7?Thanks,Angier AmesN4ZQhttp://www.=====================http://forums.matronics.com




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