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MLB 100 APX340 Install

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Msieger View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Msieger Quote  Post ReplyReply Direct Link To This Post Topic: MLB 100 APX340 Install
    Posted: 22 Feb 2018 at 8:06pm
Hi,
New installation here. All is working well except when configuring the MLB with the UAT software I cannot get the pressure altitude to display correctly. I get -1025 instead of around zero. Pressure altitude is correct on the 340 display. I have checked all wiring between the two units and all is well. What am I missing?????


Mike

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AviTJ View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AviTJ Quote  Post ReplyReply Direct Link To This Post Posted: 23 Feb 2018 at 8:17am
Originally posted by Msieger Msieger wrote:

Hi,
New installation here. All is working well except when configuring the MLB with the UAT software I cannot get the pressure altitude to display correctly. I get -1025 instead of around zero. Pressure altitude is correct on the 340 display. I have checked all wiring between the two units and all is well. What am I missing?????


Mike


Mike,
Can you send the wiring/configuration info you have to techsupport@avidyne.com ?  There are a handful of things we would need to see to make a best guess at what's causing this.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Msieger Quote  Post ReplyReply Direct Link To This Post Posted: 23 Feb 2018 at 8:17pm
Hey TJ thanks for the response,

Here is what I found out today. I talked to Roland this morning and he advised me to disable the pseudo squat switch in both the the 340 and the 540. I did and no changes. I then pulled a new 340 transponder from my aircraft and slid it into the tray and everything worked without even doing any configuration changes to my transponder. Sooooo this tells me I either have configuration issues with the first 340 or we have a bad 340 that is not repeating the encoder info via pin 6 to pin 7 on the MLB. I believe this also verifies my wiring.  Only other thing I noticed is the TIS-b flag is displayed on the 540 all the time. This system is wired according to Rev 5 diagram using RS232.

I am also having issues enabling the wifi and bluetooth on this customers new 540 just a heads up.


Mike
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DavidBunin Quote  Post ReplyReply Direct Link To This Post Posted: 25 Feb 2018 at 8:30am
"-1025" is the UAT's way of telling you that it isn't receiving valid altitude data from its source (whatever you have it wired to).


Edited by DavidBunin - 25 Feb 2018 at 8:30am
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Msieger View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Msieger Quote  Post ReplyReply Direct Link To This Post Posted: 25 Feb 2018 at 5:00pm
That is correct, but is it due to some config issue or is it due to transponder that is not repeating said altitude???? I will know more tommorow. 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Msieger Quote  Post ReplyReply Direct Link To This Post Posted: 25 Feb 2018 at 5:02pm
It works with another 340 that is not even configured to that plane. So Im going to configure this transponder to the aircraft and see what happens. That will prove once and for all whether or not its the transponder.

Mike
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Post Options Post Options   Thanks (0) Thanks(0)   Quote AviTJ Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2018 at 9:01am
Originally posted by Msieger Msieger wrote:

It works with another 340 that is not even configured to that plane. So Im going to configure this transponder to the aircraft and see what happens. That will prove once and for all whether or not its the transponder.

Mike

Mike,
The "Repeated" altitude out of the 340 should be active at all times (if wired).  I've honestly never checked one out without having first programmed the tail number, ADS-B parameters, etc.  It may be that it's not configured, and that output may not go active until it is.  I'll have to investigate if that's how it's "supposed" to work.  The default protocol for that output is "Icarus" format, and is not configurable.  Let me know what you find.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Msieger Quote  Post ReplyReply Direct Link To This Post Posted: 26 Feb 2018 at 8:05pm
TJ,

I programmed the second transponder and it worked great so I doubt its a config issue. For some reason pin 6 is not repeating the altitude. Thats what I found today. Roland is checking on warranty status for me. Im fresh out of ideas and have to call it a bad transponder as of now. Call me tommorw morning if you want to go over the config.

Mike
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