Using 2 LNAs for Inmarsat

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KC2Land
Posts: 4
Joined: Sun Jan 10, 2016 7:06 pm
Location: Long Island NY

Using 2 LNAs for Inmarsat

Post by KC2Land » Sun Jan 10, 2016 7:21 pm

Hi,

I've had reasonable success using SDRplay, homebrew patch antenna and 1 LNA for Inmarsat reception. I tried using 2 LNAs in series to try to get higher gain but I'm not seeing any signals when I do that. I have each of LNAs powered by separate 9v batteries, plus I've double checked that the in/out connections are correct. The LNAs work fine when used individually. Any ideas on why this doesn't work? Should I be powering them differently?

Thanks,
T.
Last edited by KC2Land on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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g1hbe
Posts: 494
Joined: Sat Jan 17, 2015 3:28 pm
Location: Cheshire, UK

Re: Using 2 LNAs for Inmarsat

Post by g1hbe » Sun Jan 10, 2016 11:00 pm

I wonder if there is so much gain that out-of-band signals are overloading/blocking the receiver? Do you see a large increase in noise level when you put both amps in?
Last edited by g1hbe on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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Andy
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retux
Posts: 3
Joined: Thu Jan 07, 2016 10:14 am

Re: Using 2 LNAs for Inmarsat

Post by retux » Mon Jan 11, 2016 5:44 pm

The same thing happened to me using two lna4all. Try using a high- or bandpass filter for the L-Band
Last edited by retux on Thu Jan 01, 1970 12:00 am, edited 0 times in total.
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