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Dennis Jones

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

Posted: Tue Sep 19, 2006 9:46 pm Post subject: Transponder

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

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charlieray(at)optonline.n
Guest

Posted: Wed Sep 20, 2006 2:14 am Post subject: Transponder

Apply a ground to this pin to have the encoder output on all the time. This 

is required to be on all the time with every modern transponder.



Charles



---

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Dennis Jones

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

Posted: Wed Sep 20, 2006 8:40 am Post subject: Re: Transponder

The transponder schematic shows a suppression OUT pin 1and 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 fround pin.

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charlieray(at)optonline.n
Guest

Posted: Wed Sep 20, 2006 6:29 pm Post subject: Transponder

Dennis,

What Transponder and what encoder are you using? Supression I/O is only used 

for other L band devices like active traffic (tcas) and DME.... They all 

work around 1030-1090 MHZ and the suppression lines are only used so only 

one device is active for a split second.



Strobe input at the encoder should be tied to ground, I run my gray code 

wires A1, A2, A4, B1...etc and power and ground to the encoder. some 

transponders supply switched power out to simplify the wiring to the 

encoder.  If your transponder has switched power out, thats what I would use 

to power the encoder. It does not need its own circuit breaker in general. 

I would supply ground to the endcoder by splitting the ground to the 

transponder (at the transponder rack) and sending one leg to the encoder. 

Then I would take that ground and split it into two at the encoder, one 

hooked to the ground pin and the other hooked to the strobe pin.  Like I 

said before, most all transponders want to see the Gray Code (altitude) 

input at all times, and the strobe pin being tied to ground means that the 

encoder will always be sending out gray code info.



If Im too confusing or you need more info just let me know.



Charlie

your avionics guru.



---

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Dennis Jones

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

Posted: Thu Sep 21, 2006 2:06 pm Post subject: Transponder

Charles



On the transponder the schematic shows two remote ground pins. What would they

be used for?

Dennis



Quoting Charles Reiche <charlieray(at)optonline.net>:



[quote] 



 Dennis,

 What Transponder and what encoder are you using? Supression I/O is 

 only used for other L band devices like active traffic (tcas) and 

 DME.... They all work around 1030-1090 MHZ and the suppression lines 

 are only used so only one device is active for a split second.



 Strobe input at the encoder should be tied to ground, I run my gray 

 code wires A1, A2, A4, B1...etc and power and ground to the encoder. 

 some transponders supply switched power out to simplify the wiring to 

 the encoder.  If your transponder has switched power out, thats what 

 I would use to power the encoder. It does not need its own circuit 

 breaker in general. I would supply ground to the endcoder by 

 splitting the ground to the transponder (at the transponder rack) and 

 sending one leg to the encoder. Then I would take that ground and 

 split it into two at the encoder, one hooked to the ground pin and 

 the other hooked to the strobe pin.  Like I said before, most all 

 transponders want to see the Gray Code (altitude) input at all times, 

 and the strobe pin being tied to ground means that the encoder will 

 always be sending out gray code info.



 If Im too confusing or you need more info just let me know.



 Charlie

 your avionics guru.



 ---

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