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KX125 Wiring / Nav Com Question

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lamphere(at)vabb.com
Guest

Posted: Fri Aug 24, 2007 1:59 pm Post subject: KX125 Wiring / Nav Com Question

I'm in the process of rewiring the connectors on a used King KX125 nav/com 

and am puzzled by a couple of pins that were previously wired.



Connector P501 pins H and J are labeled (according to pinout I got from the 

aeroelectric website):



    (H) VOR/LOC COMPOSITE IN and (J) VOR/LOC COMPOSITE OUT



These were previously jumpered together with a wire leading off from the 

pair..



Would someone who is familiar with NAV/COMS please explain what these pins 

are used for and a guess as to where  they could have been connected to (in 

it's previous life)??



Thanks,



Dave

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rjquillin

Joined: 13 May 2007
Posts: 123
Location: KSEE

Posted: Fri Aug 24, 2007 6:08 pm Post subject: KX125 Wiring / Nav Com Question

At 14:54 8/24/2007, you wrote:

 	  Quote: 	
		  Would someone who is familiar with NAV/COMS please explain what 

these pins are used for and a guess as to where  they could have 

been connected to (in it's previous life)??


	


External RMI perhaps?

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Melvinke(at)coho.net
Guest

Posted: Fri Aug 24, 2007 6:21 pm Post subject: KX125 Wiring / Nav Com Question

The wiring diagram for the KX125 shows these connections drive an external

indicator such as KI208, KI209.

Kenneth Melvin

N669TJ

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mlas(at)cox.net
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Posted: Fri Aug 24, 2007 6:52 pm Post subject: KX125 Wiring / Nav Com Question

Those pins are used to drive certin CDIs, RMIs or HSIs that accept a

single composite line.  Older unites require the older style of direct

analog signaling.  With the composite signal you can send the

information over one wire instead of the 6-10 from the analog style.

Both sides have to be able to interpret a composite signal.  Hope this

helps!



Mike



--

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lamphere(at)vabb.com
Guest

Posted: Sat Aug 25, 2007 3:21 am Post subject: KX125 Wiring / Nav Com Question

Thanks to all that responded. Due to another persons kindness, I obtained an 

installation manual for the KX125. You guys are correct in that the vor/loc 

composite signal pins are used for driving an indicator. What isn't clear or 

mentioned in the manual, is whether these two pins need to be jumpered (even 

if you are not using an external indicator).. if there is an output AND 

input involved, then does the unit need this jumper for it to function 

properly?



I would guess that it won't hurt to put this jumper in anyway.. 



Dave



---

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deene(at)austin.rr.com
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Posted: Sat Aug 25, 2007 6:10 am Post subject: KX125 Wiring / Nav Com Question

The jumper is required (and I know as I just spend several weeks debugging a KX125 installation in which the internal VOR indicator would not work).  I had to talk to the factory tech guy to get this info as the installation schematic shows the jumper as part of a connection to an external indicator but DOES NOT have a note indicating that the jumper is required for the operation of the internal VOR indicator.  

   

Deene Ogden  

EAA Tech Counselor/Flight Advisor  

   

        [quote][b]

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lamphere(at)vabb.com
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Posted: Sat Aug 25, 2007 8:06 am Post subject: KX125 Wiring / Nav Com Question

Whoops!  Make that thank you Deene

  

 ... eyes must be going!

  

 Dave

    [quote][b]

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lamphere(at)vabb.com
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Posted: Sat Aug 25, 2007 8:06 am Post subject: KX125 Wiring / Nav Com Question

AHAH!!!  Thanks  Duane!

  

 without an external indicator, there aren't too many  connections required.

  

 Dave

 [quote]   ---

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