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rgf(at)dcn.davis.ca.us
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 Posted: Thu Apr 09, 2009 8:51 am Post subject: Basic wiring questions Try Again |
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Basic questions again! 2nd try, hello Bob N. or somebody, hope you can
answer these:
I have landing/taxi lights, LED nav lights, a Bob Archer VOR antenna, and an
APRS tx/rx antenna in the ends of the wings of an RV-9A (one antenna in each
tip).
1. For the powered items, can I run a single positive wire of adequate size
to a terminal block, then feed the devices from the block?
2. For the antennas, yes they will be using coax, but should I nevertheless
try to run the coax physically separate from the power wires? In addition
to the above power wire I have a 3-wire bundle run from the strobe power
supply in the fuselage to the wing-tip strobe lights. I installed a conduit
about 18 inches away from the Vans wire holes for the purpose of separating
power wires from very weak signals.
3. The Bob Archer antenna has two lugs; instructions say to strip the coax
cable and attach the stranded core to one lug, the shield to another lug. I
would like that coax to be just a couple feet long, ending in a BNC or
similar connector, so I can easily remove the fiberglass wingtip from the
wing. Will the coax connector introduce too much impedance?
Thanks,
Ralph Finch
Davis, CA
RV-9A QB-SA
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frank.hinde(at)hp.com
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| Posted: Thu Apr 09, 2009 9:51 am Post subject: Basic wiring questions Try Again |
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1) Sure..But ti depends if you need to switch said devices independantly..For example, with LED Nav lights you might want to combine those with the LED NAV lights..LED's consume almost no power and last forever. When running the APRS you can have the NAV lights on.
But you wouldn't want to run the landing lights with the Nav lights due to the significant power draw of the landing lights.
2) I never had the sligthest noise interference with coax near power wires or sheilded strobe wires for that matter.
3) Yup that's how I did it on the 7..Simply use a bulkhead BNC on the outer wing rib and plug in your antenna coax..Works great.
Frank IO360 7a electrically dependant..including the fuel pumps!
--
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nuckolls.bob(at)aeroelect
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| Posted: Thu Apr 09, 2009 11:54 am Post subject: Basic wiring questions Try Again |
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At 11:48 AM 4/9/2009, you wrote:
| Quote: |
Basic questions again! 2nd try, hello Bob N. or somebody, hope you can
answer these:
|
Sorry Ralph.
| Quote: | I have landing/taxi lights, LED nav lights, a Bob Archer VOR antenna, and an
APRS tx/rx antenna in the ends of the wings of an RV-9A (one antenna in each
tip).
1. For the powered items, can I run a single positive wire of adequate size
to a terminal block, then feed the devices from the block?
|
How would you control these devices? All ON/OFF at
the same time with a single switch? Recommend you
stay with
| Quote: | 2. For the antennas, yes they will be using coax, but should I nevertheless
try to run the coax physically separate from the power wires? In addition
to the above power wire I have a 3-wire bundle run from the strobe power
supply in the fuselage to the wing-tip strobe lights. I installed a conduit
about 18 inches away from the Vans wire holes for the purpose of separating
power wires from very weak signals.
|
Don't worry about it. A rudimentary feature of coax cable
provides isolation between what goes on INSIDE the cable
from what goes on OUTSIDE the cable. In the big airplanes, coax
cables and all manner of airframe systems wires share common
wire bundles.
| Quote: | 3. The Bob Archer antenna has two lugs; instructions say to strip the coax
cable and attach the stranded core to one lug, the shield to another lug. I
would like that coax to be just a couple feet long, ending in a BNC or
similar connector, so I can easily remove the fiberglass wingtip from the
wing. Will the coax connector introduce too much impedance?
|
No. Connectors to address your needs are commonly
available and install with the same tools as your
cable-male BNC connectors. See:
http://www.aeroelectric.com/Pictures/Connectors/Coax/BNC_Cable_Female_1.jpg
http://www.aeroelectric.com/Pictures/Connectors/Coax/BNC_Cable_Female_2.jpg
http://www.aeroelectric.com/Pictures/Connectors/Coax/BNC_Bulkhead_Female.jpg
Bob . . .
----------------------------------------)
( . . . a long habit of not thinking )
( a thing wrong, gives it a superficial )
( appearance of being right . . . )
( )
( -Thomas Paine 1776- )
----------------------------------------
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