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KX-155 Audio Out

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txpilot

Joined: 26 Feb 2007
Posts: 87
Location: Houston, TX

Posted: Tue Mar 25, 2008 3:10 pm Post subject: KX-155 Audio Out

I have a KX-155 and a Sigtronics Sport 200 intercom.  I'm trying to figure out the proper wiring between units.  The KX-155 has an 'audio hi' and 'audio lo' for both the comm and nav.  I'm confused what is meant with the 'hi' and 'lo'.



Are the 'audio hi' connections supposed to go to the common blue intercom wire, common with the headset jacks, while the 'audio lo' connections go to ground?  If that's the case, why must the 'audio lo' connections be shielded if it's going to ground anyway?



Thanks for your help!



Dan Ginty

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n801bh(at)NetZero.com
Guest

Posted: Tue Mar 25, 2008 3:54 pm Post subject: KX-155 Audio Out

I got tripped up on that term when I was wiring my experimental too. I have wired alot of car radios and other stuff growing up so the  Hi/ Lo thing seemed strange. Someone on this list straightened me out. The HI is really the hot wire or feed, the Low is just the ground. Why they don't call it that is beyond me.. 

do not archive

Ben Haas

N801BH

www.haaspowerair.com



-- "txpilot" <djg7(at)comcast.net> wrote:

--> AeroElectric-List message posted by: "txpilot" <djg7(at)comcast.net>



I have a KX-155 and a Sigtronics Sport 200 intercom.  I'm trying to figure out the proper wiring between units.  The KX-155 has an 'audio hi' and 'audio lo' for both the comm and nav.  I'm confused what is meant with the 'hi' and 'lo'.



Are the 'audio hi' connections supposed to go to the common blue intercom wire, common with the headset jacks, while the 'audio lo' connections go to ground?  If that's the case, why must the 'audio lo' connections be shielded if it's going to ground anyway?



Thanks for your help!



Dan Ginty





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nuckolls.bob(at)cox.net
Guest

Posted: Wed Mar 26, 2008 3:16 am Post subject: KX-155 Audio Out

At 11:49 PM 3/25/2008 +0000, you wrote:



 	  Quote: 	
		  I got tripped up on that term when I was wiring my experimental too. I 

have wired alot of car radios and other stuff growing up so the  Hi/ Lo 

thing seemed strange. Someone on this list straightened me out. The HI is 

really the hot wire or feed, the Low is just the ground. Why they don't 

call it that is beyond me..



do not archive

Ben Haas

N801BH

www.haaspowerair.com



-- "txpilot" <djg7(at)comcast.net> wrote:




I have a KX-155 and a Sigtronics Sport 200 intercom.  I'm trying to figure 

out the proper wiring between units.  The KX-155 has an 'audio hi' and 

'audio lo' for both the comm and nav.  I'm confused what is meant with the 

'hi' and 'lo'.



Are the 'audio hi' connections supposed to go to the common blue intercom 

wire, common with the headset jacks, while the 'audio lo' connections go 

to ground?  If that's the case, why must the 'audio lo' connections be 

shielded if it's going to ground anyway?



Thanks for your help!



Dan Ginty


	


    Not all "LO" sides of signals paths are necessarily grounded.

    I wasn't 'in the business' when the vernacular was adopted

    and in any case, whoever conceived it probably used a reasonable

    thought process. When one needs to identify power or signal

    pathways and their functionality, a common vernacular is

    seldom shared between disciplines. The electricians who wired

    your house called them "line", "neutral" and "ground". In the

    DC power world they might favor (+) and (-). In the AC signal

    world the plus minus thing doesn't fit but there's still a need

    to differentiate between the two wires for the purposes of

    phasing. Hence the HI and LO thing. It's quite common for

    the LO side of a path to get to ground somewhere in the system

    but be totally floating in the far reaches of the wiring to

    various components . . . it's that control-your-ground-loops

    thing.



    It can be frustrating but those are the cards that are

    dealt to us. Without seeing the internal schematic for the

    black boxes your trying to tie together, one cannot deduce

    the rationale for shielding a LO side wire. I would guess

    that it's because its simply the ac equivalent of a minus-side

    in a DC circuit; intended to denote phasing and not

    necessarily "ground".



    I've had a few notes from readers over the years chiding

    me for my "follow the instructions" recommendations for

    answering questions on shield grounds. "Surely", they say,

    "there must be some common rules of physics that can/should

    guide us in all cases."  The vernacular adopted by the

    manufacturer's installation data and the designer's goals

    for architecture are not necessarily common so the ultimate

    map to Nirvana is the schematic. If a wire or shield is

    shown to be connected in a particular manner, then it

    matters not what it's called or how the shield or wire is

    used. Schematics are the universal language in electronics

    even if the symbols are sometimes a bit funny looking.



    Bob . . .

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