nuckollsr(at)cox.net
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 Posted: Wed Sep 20, 2006 7:22 pm Post subject: Transponder "Strobe" Signal |
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At 08:39 AM 9/20/2006 -0700, you wrote:
| Quote: |
<djones(at)northboone.net>
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.
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STROBE input to the encoder is not the same as
blanking or suppression signals exchanged between
Transponders, DME, TCAS, etc.
The strobe input to an encoder is a remnant of
the older transponder technology that requested
altitude data periodically by means of the "strobe"
signal to an encoder. I've not seen this signal used
in along time. I belive you use this pin hanging open
on the encoder if it's not needed. The encoder installation
manual should tell you what to do with the un-needed
signal.
I found a copy of an Ameri-King AK-350 that I used
to sell on Ameri-King's wegsite at:
http://www.ameri-king.com/pdf/9.1.23.pdf
Note that on page 24 of the manual it speaks to
an pulling up on the encoder's strobe signal to
make it active and pulling it down to disable
the encoder. It's probably fitted with an internal
pull-up resistor such that leaving the pin open
makes the encoder active all the time.
Other pages speak to wiring this pin to certain
transponders (all out of production).
Bob . . .
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< 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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