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DME/Transponder Suppression

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currydon(at)bellsouth.net
Guest

Posted: Mon Mar 24, 2008 7:26 pm Post subject: DME/Transponder Suppression

When a KT-76A transponder and a KN-63 DME are installed in an aircraft, and

the two units are connected via suppression circuitry built into both units,

is it necessary to comply with the requirement for there to be 6-foot

spacing between the two antennae?  I can't find an exception to this rule in

the install manual for either unit, yet I understand the suppression circuit

is designed to keep each unit from receiving the other unit's transmission.

So, why should it matter how close the antennae are to eachother?

Thanks,

Don

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nuckolls.bob(at)cox.net
Guest

Posted: Tue Mar 25, 2008 3:23 am Post subject: DME/Transponder Suppression

At 11:14 PM 3/24/2008 -0400, you wrote:



 	  Quote: 	
		  



When a KT-76A transponder and a KN-63 DME are installed in an aircraft, and

the two units are connected via suppression circuitry built into both units,

is it necessary to comply with the requirement for there to be 6-foot

spacing between the two antennae?  I can't find an exception to this rule in

the install manual for either unit, yet I understand the suppression circuit

is designed to keep each unit from receiving the other unit's transmission.

So, why should it matter how close the antennae are to eachother?


	


    Transponders and DME use frequencies very close to each other

    and there's risk of receiver overloading in one device due to

    the very strong signal from the other device. This is mostly

    mitigated electronically via the suppression system but the

    6' rule gave the engineers and marketing types a warmer set

    of fuzzies. Give it a try doing the best you can. It will

    probably be fine.



    Have you considered a GPS receiver in lieu of DME? DME works

    with a hand full of ground stations while GPS will give you

    distance to any point on the surface of the earth. DME

    is one of those electronic buggy whips that needs to be

    moved to the museum.



    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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BobsV35B(at)aol.com
Guest

Posted: Wed Mar 26, 2008 1:35 am Post subject: DME/Transponder Suppression

Good Morning Don and 'Lectric Bob,

  

 I imagine you are both aware of this, but just in case some others may not  be, the GPS is a legal substitute for any published IFR DME function.  The  GPS must be in an IFR approved installation configuration, but it does not have  to be approach approved, just enroute and terminal approved.

  

 The substitution is approved in the entire US National Airspace system and  in many other countries as well.

  

 Happy Skies,

  

 Old Bob

 AKA

 Bob Siegfried

 N3977A

 Downers Grove, IL

  

  In a message dated 3/25/2008 6:25:57 A.M. Central Daylight Time,  nuckolls.bob(at)cox.net writes:

  	  Quote: 	
		  Have you    considered a GPS receiver in lieu of DME? DME works

    with a    hand full of ground stations while GPS will give you

    distance    to any point on the surface of the earth. DME

    is one of those    electronic buggy whips that needs to be

    moved to the    museum.



    Bob . .  .

	




Create a Home Theater Like the Pros. Watch the video on AOL Home.

  [quote][b]

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