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rparigoris
Joined: 24 Nov 2009
Posts: 792
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 Posted: Thu Oct 01, 2020 9:00 am Post subject: Can I power ADS-B from Transponder switched output? |
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Hi Group I have a Garmin GDL-82 ADS-B that draws .35A typical and .4A maximum. I have a Becker Mode-C transponder that has a 1A switched output. Is there a good reason why I should not use the transponder switched output to power the ADS-B? I don't have an avionics bus. Ron P.
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Thu Oct 01, 2020 9:41 am Post subject: Re: Can I power ADS-B from Transponder switched output? |
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Since the two units work together as a team, it is not an emergency if you lose both.
On the other hand, best practice is to protect each individual load with its own fuse.
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rparigoris
Joined: 24 Nov 2009
Posts: 792
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| Posted: Thu Oct 01, 2020 9:48 am Post subject: Re: Can I power ADS-B from Transponder switched output? |
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Hi User 9253 The switched output of the Becker transponder has a 1 amp fuse. Is that OK? Ron P.
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user9253
Joined: 28 Mar 2008
Posts: 1921
Location: Riley TWP Michigan
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| Posted: Thu Oct 01, 2020 12:15 pm Post subject: Re: Can I power ADS-B from Transponder switched output? |
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OK then, since the transponder DC output is fused and units are related, I think it is OK to wire them as proposed.
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