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 Post subject: Extracting 5V DC from a Bias-T to power a LNA
PostPosted: May Wed 18, 2022 10:09 am 
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Joined: May Wed 18, 2022 10:01 am
Posts: 1
Hey All!

I'm having several LNA boards I want to power using a Bias-T (4.5V..5V from a RTLSDR) to get them as close to their antennas as possible.

Let's say I want receive a frequency range from 50 - 1500MHz (Smaller region will be bandpass filtered. But not interesting in case).

Are there some easy ways to extract the DC? Is it enough just building a Low-pass with single choke?

Best Regards!
https://9apps.ooo/


Last edited by avicci on Jun Sun 12, 2022 6:32 am, edited 2 times in total.

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 Post subject: Re: Extracting 5V DC from a Bias-T to power a LNA
PostPosted: May Wed 18, 2022 11:49 am 
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Joined: Jan Fri 02, 2009 10:32 pm
Posts: 817
Location: Equinunk/PA
This is an informative video from Alan Wolke W2AEW
https://www.youtube.com/watch?v=lxgpm-UXTNY

There will be insertion loss. A single choke? Maybe. I guess it doesn't cost much to build your own and try it but it'll be hard to know what's happening across your full bandwidth without a decent test setup. Pay attention to inductor core saturation from DC. Good luck! Let us know how you make out.

edit: I would either buy a couple of 1-2000 mHz boards from the auction site for my experimenting or I'd buy minicircuits Tee's and not worry (as much).

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-Richard


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