AXP340/322 ADS-B Transponder - Altitude Encoder Compatibility

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Altitude Encoder Compatibility

Printed From: Avidyne
Category: Avidyne General
Forum Name: AXP340/322 ADS-B Transponder
Forum Description: Topics on the Avidyne AXP340/322 ADS-B Transponder
URL: https://avidynelive.com/forum_posts.asp?TID=1386
Printed Date: 26 Mar 2026 at 2:12pm
Software Version: Web Wiz Forums 12.07 - https://www.webwizforums.com

Topic: Altitude Encoder Compatibility

Posted By: PredFan
Subject: Altitude Encoder Compatibility
Date Posted: 27 Aug 2017 at 11:59am

I'm getting ready to wire my AXP340 per the installation manual. My existing encoder is a Trans-Cal D120-P2-T. Should I expect issues that might require updating my encoder? I have already replaced a Garmin 430W with an IFD440.

Replies:

Posted By: LANCE
Date Posted: 28 Aug 2017 at 2:59am

Most installers I've talked to recommend the Trans-Cal Nano ( http://www.aircraftspruce.com/catalog/avpages/transcalencoder.php" rel="nofollow - http://www.aircraftspruce.com/catalog/avpages/transcalencoder.php )

For $269 it sounds like it would be worth it and it looks like it is pin compatible with yours current encoder.

Posted By: PredFan
Date Posted: 28 Aug 2017 at 8:09am

Thanks Lance, I've got a call into Tech support to get their thoughts as well.

Posted By: rsharp
Date Posted: 16 Jan 2018 at 3:16pm

Another acceptable Serial Encoder is the ACK A30.9 (Mod 9) encoder. ($245)

Its suppose to work with the AXP340, SkyTrax100 and the IDF5x0 series.

You have 2ea serial RS232 lines, split one line off to connect to the 2 units.

I just ordered the unit and waiting for my avionics.

Randy

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Regards,
RLSharp

Posted By: chflyer
Date Posted: 16 Jan 2018 at 11:35pm

If we're listing encoders that work with the AXP340, I have a Sandia 5-35 that was installed before my AXP340. It also has 2x serial output. Sandia is high quality and works well together with my AXP340 and IFDs.

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Vince

Posted By: rsharp
Date Posted: 17 Jan 2018 at 9:18am

Yes Sandia is a great company with some great products.

Wish I had it in the budget to get the Sandia SAC 7-35 Air Data Computer.

It's around $2750 but the box has 4 functions: ADC, Encoder, FF monitor, and Altitude alerter.

This ADC I believe would put A/S & Altitude strips on the 550 while viewing in the SVS mode.

Randy

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Regards,
RLSharp