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Dennis Jones

Joined: 17 Sep 2006
Posts: 45
Location: Poplar Grove, IL

Posted: Tue Sep 19, 2006 9:40 pm Post subject: Transponder

What is a strobe output/input for a transponder/encoder?

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nuckollsr(at)cox.net
Guest

Posted: Wed Sep 20, 2006 5:18 am Post subject: Transponder

At 10:40 PM 9/19/2006 -0700, you wrote:



 	  Quote: 	
		  

<djones(at)northboone.net>



What is a strobe output/input for a transponder/encoder?


	




    "Strobe" or "blanking" pins are included in some

    systems that transmit and/or receive high-power

    pulses on adjacent frequencies. For example, transponders

    and DME on airplanes use these signal lines to

    put temporary earplugs in the ears of another system

    while it's "shouting" to the ground station.



    I wish my neighbor's dog came with a strobe signal

    that would shut off my ears for the duration of each

    bark.



    This courtesy signal traded between potentially

    antagonist/victim systems allows them to co-exist

    on the same airplane while minimizing degraded

    performance from receiver overload when one of

    the transmitters "shouts".



    Bob . . .



      ---------------------------------------------------------

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

      ---------------------------------------------------------

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Dennis Jones

Joined: 17 Sep 2006
Posts: 45
Location: Poplar Grove, IL

Posted: Wed Sep 20, 2006 7:39 am Post subject: Re: Transponder

The transponder schematic shows a suppression OUT pin 1 and a EXT. DME suppression IN pin 6. Because I do not have a DME I  understand that both of these pins would be empty. Would this be what the encoder schematic is showing as  the strobe input? If so then this pin would not be used and would be pigtailed to the ground pin.[/list]

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dave(at)abrahamson.net
Guest

Posted: Thu Sep 21, 2006 3:25 am Post subject: Transponder

My AK350 would not provide data to my GTX330 until I grounded the pin 

the AK350 instructions say to ground for a non-strobed transponder.

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nuckollsr(at)cox.net
Guest

Posted: Thu Sep 21, 2006 5:03 am Post subject: Transponder

At 07:24 AM 9/21/2006 -0400, you wrote:



 	  Quote: 	
		  



My AK350 would not provide data to my GTX330 until I grounded the pin the 

AK350 instructions say to ground for a non-strobed transponder.


	




    Thank you for jumping in here Dave! It's been a long

    time since I've built a T2000/AK350 harness so when

    I went to the instruction manual last night I just

    searched the .pdf for "strobe" and the program jumped

    to page 24 where I read:

------------------

    "The Altitude Reporter AK-350 is remote mounted equipment

    that is fully automatic in operation. The companion

    ATC transponder normally controls the operation of hte

    Altitude Reporter by automatically enabling or disabling

    its operation.



    This is done by pulling-up to logic LOW (to enable)

    or pulling-down to logic HIGH (to disable) the STROBE

    (pin 6) line of the Altitude Reporter."

------------------



    Hmmm . . . NORMALLY in electro-speak, one pulls a line

    DOWN for logic LO and pulls UP for logic HI. I stumbled

    over the words in the paragraph and then recalled that

    in some interface wiring, inverting buffers are used

    between internal electronics and outside world wiring.

    Outside the box, logic LO is in fact a higher voltage

    than logic HI which is ground.



    So, I sailed around what appeared to be a rational

    condition.  Now, as Dave has suggested, the WIRING

    DIAGRAMS earlier in the manual are quite specific for

    treatment of the STROBE line when the companion

    transponder doesn't need it: the line is firmly attached

    to ground.



    I do recall now that when I was selling the T2000

    MicroAir and associated harness to mate with the AK350,

    the pink wire in the harness was paired with the

    ground wire to the transponder.



    It's always helpful to have more than one head pondering

    meanings to at least raise valid questions if not

    point out blatant errors. Had I reached past the search

    engine and reviewed the wiring diagrams, the error of

    my earlier understanding would have been obvious.



    This, ladies and gentlemen, is a micro-example of

    a good critical design review. Understanding of words,

    and ordinary errors can be impediments to progress.

    Dave gets the "Atta Boy" nod for the day.



    Bob . . .

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nuckollsr(at)cox.net
Guest

Posted: Thu Sep 21, 2006 11:16 am Post subject: Transponder

At 07:24 AM 9/21/2006 -0400, you wrote:



 	  Quote: 	
		  



My AK350 would not provide data to my GTX330 until I grounded the pin the 

AK350 instructions say to ground for a non-strobed transponder.


	




    Thank you for jumping in here Dave! It's been a long

    time since I've built a T2000/AK350 harness so when

    I went to the instruction manual last night I just

    searched the .pdf for "strobe" and the program jumped

    to page 24 where I read:

------------------

    "The Altitude Reporter AK-350 is remote mounted equipment

    that is fully automatic in operation. The companion

    ATC transponder normally controls the operation of hte

    Altitude Reporter by automatically enabling or disabling

    its operation.



    This is done by pulling-up to logic LOW (to enable)

    or pulling-down to logic HIGH (to disable) the STROBE

    (pin 6) line of the Altitude Reporter."

------------------



    Hmmm . . . NORMALLY in electro-speak, one pulls a line

    DOWN for logic LO and pulls UP for logic HI. I stumbled

    over the words in the paragraph and then recalled that

    in some interface wiring, inverting buffers are used

    between internal electronics and outside world wiring.

    Outside the box, logic LO is in fact a higher voltage

    than logic HI which is ground.



    So, I sailed around what appeared to be a rational

    condition.  Now, as Dave has suggested, the WIRING

    DIAGRAMS earlier in the manual are quite specific for

    treatment of the STROBE line when the companion

    transponder doesn't need it: the line is firmly attached

    to ground.



    I do recall now that when I was selling the T2000

    MicroAir and associated harness to mate with the AK350,

    the pink wire in the harness was paired with the

    ground wire to the transponder.



    It's always helpful to have more than one head pondering

    meanings to at least raise valid questions if not

    point out blatant errors. Had I reached past the search

    engine and reviewed the wiring diagrams, the error of

    my earlier understanding would have been obvious.



    This, ladies and gentlemen, is a micro-example of

    a good critical design review. Understanding of words,

    and ordinary errors can be impediments to progress.

    Dave gets the "Atta Boy" nod for the day.



    Bob . . .

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dave(at)abrahamson.net
Guest

Posted: Fri Sep 22, 2006 2:48 am Post subject: Transponder

Glad my one cent was useful to someone.  Just to highlight the fact 

that this great list includes the illuminati of electronics as well 

as the cretini of homebuilding (me) -- and for TGIF comic relief, it 

may be worth detailing my thought process regarding the strobe wiring 

in a few sentences.  Not knowing, and continually forgetting to ask 

whether the GTX330 is a strobe/non-strobe type xponder, I went with 

the seems-reasonable-to-me approach and picked the AK350 wiring 

diagram (p.8A) that left pin 6 (strobe) unconnected.  Later, seeing 

that no altitude was being reported, and after checking that all the 

A, B, and C wires were connected correctly, I figured the last 

possible step was to connect the strobe wire to ground, as indicated 

in the non-strobe version of p.8A's diagram.  I figured it would 

either work, or a puff of acrid smoke would emanate from the box and 

I'd be out $150, which compared to the total cost of the airplane 

would be an acceptable loss.  So, that's how the mind of this 

OBAM-building monkey worked in this case and no, this anecdote is not 

indicative of my aeronautical decision making.

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nuckollsr(at)cox.net
Guest

Posted: Fri Sep 22, 2006 4:58 am Post subject: Transponder

At 06:46 AM 9/22/2006 -0400, you wrote:



 	  Quote: 	
		  



Glad my one cent was useful to someone.  Just to highlight the fact that 

this great list includes the illuminati of electronics as well as the 

cretini of homebuilding (me) -- and for TGIF comic relief, it may be worth 

detailing my thought process regarding the strobe wiring in a few 

sentences.  Not knowing, and continually forgetting to ask whether the 

GTX330 is a strobe/non-strobe type xponder, I went with the 

seems-reasonable-to-me approach and picked the AK350 wiring diagram (p.8A) 

that left pin 6 (strobe) unconnected.  Later, seeing that no altitude was 

being reported, and after checking that all the A, B, and C wires were 

connected correctly, I figured the last possible step was to connect the 

strobe wire to ground, as indicated in the non-strobe version of p.8A's 

diagram.  I figured it would either work, or a puff of acrid smoke would 

emanate from the box and I'd be out $150, which compared to the total cost 

of the airplane would be an acceptable loss.  So, that's how the mind of 

this OBAM-building monkey worked in this case and no, this anecdote is not 

indicative of my aeronautical decision making.


	


    I've stumbled a bit on AmeriKing's wiring digarams too. I

    THINK the only error in the manual is the syntax of logic

    hi versus lo on page 24. Note that every time you see a

    un-connected pin labeled STROBE, its the TRANSPONDER pin,

    not the encoder pin.



    Every wiring diagram (and chart) shows the ENCODER STROBE

    pin 6 hooked somewhere whether to some pin on the transponder

    or ground. This conversation has been useful. I doubt that

    I'll forget it again. Thanks!



    Bob . . .

      ---------------------------------------------------------

      < What is so wonderful about scientific truth...is that >

      < the authority which determines whether there can be   >

      < debate or not does not reside in some fraternity of   >

      < scientists; nor is it divine. The authority rests     >

      < with experiment.                                      >

      <                            --Lawrence M. Krauss       >

      ---------------------------------------------------------

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Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

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