Today's Message Index:
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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
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| Subject: | 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
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| Subject: | Re: OAT Probes for Garmin Transponder |
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.
>
> <Attached is the datasheet for the device.> 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
>
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