---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 07/09/22: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:07 PM - OAT Probes for Garmin Transponder (Jared Yates) 2. 07:55 PM - Re: OAT Probes for Garmin Transponder (Charlie England) ________________________________ Message 1 _____________________________________ Time: 07:07:15 PM PST US From: Jared Yates Subject: AeroElectric-List: OAT Probes for Garmin Transponder I've been working with a Garmin GTX 335 transponder installation. There is an optional outside air temp probe that enables a handy density altitude feature. I found one reference that says the transponder is looking for this: OUTSIDE AIR TEMPERATURE PROBE STANDARD 2-WIRE THERMOCOUPLE WITH 1 MICRO-AMP PER 1 DEGREE KELVIN RESPONSE. SUITABLE MODELS ARE: EDMO 655 AND DAVTRON C307PS. I tried an extra Dynon OAT probe that I had sitting around, and it indicated 175 degrees F. So I can rule out that one. The extra transponder feature is cool but not really cool enough to spend $150 on one of the above probes. Does anyone know what kind of thermocouple will produce 1 microamp per degree kelvin? Seems like making something up might be a fun experiment. ________________________________ Message 2 _____________________________________ Time: 07:55:42 PM PST US Subject: Re: AeroElectric-List: OAT Probes for Garmin Transponder From: Charlie England On 7/9/2022 9:52 PM, Charlie England wrote: > On 7/9/2022 9:06 PM, Jared Yates wrote: >> I've been working with a Garmin GTX 335 transponder installation. >> There is an optional outside air temp probe that enables a handy >> density altitude feature. >> >> I found one reference that says the transponder is looking for this: >> OUTSIDE AIR TEMPERATURE PROBE STANDARD 2-WIRE THERMOCOUPLE WITH 1 >> MICRO-AMP PER 1 DEGREE KELVIN RESPONSE. SUITABLE MODELS ARE: EDMO 655 >> AND DAVTRON C307PS. >> >> I tried an extra Dynon OAT probe that I had sitting around, and it >> indicated 175 degrees F. So I can rule out that one. >> >> The extra transponder feature is cool but not really cool enough to >> spend $150 on one of the above probes. Does anyone know what kind of >> thermocouple will produce 1 microamp per degree kelvin? Seems like >> making something up might be a fun experiment. > According to this link: > https://www.davtron.com/product-detail.php?PROBE-12FT-WHT-C307PS-26 > The actual device is an AD590. > > Scratch that; the server > won't accept a pdf file. If you want it, email me directly & I'll send > you a copy. > Here's a link to an ebay listing: > https://www.ebay.com/itm/122222526186 > I bought a couple from that vendor, and used one with an AFS4500; it > works fine. I don't know whether the Dynon probe is the same as the > one AFS used with their older EFISs. > > Hope the above info helps, > > Charlie > -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.