Connection order

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c1v
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Joined: Wed Sep 11, 2013 9:44 am

Connection order

Post by c1v » Wed Sep 11, 2013 9:59 am

Hi all,

sorry for this noob question! I have a LNA and an upconverter connected to a 20m dipole. What should be the connection order for the lowest noiselevel?

Antenna <-> LNA <-> Upconverter <-> rtl-sdr

or first upconverter then LNA?
Hadn't the opportunity to try it out myself (what i will definitely do), but im curious what theoretically should be the best order.

greetings!
c1v

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Xphome
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Joined: Mon Sep 09, 2013 1:06 am
Location: Sweden
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Re: Connection order

Post by Xphome » Wed Sep 11, 2013 3:29 pm

I forwarded your question to the ##rtlsdr IRC channel and got this response.
[16:36:15] <dh0ks> the lna always belongs to the antenna
[16:36:21] <dh0ks> ofc
[16:36:42] <dh0ks> you don't want to amplify the noise of the converter

soooooil
Posts: 4
Joined: Thu Aug 29, 2013 11:30 am

Re: Connection order

Post by soooooil » Wed Sep 11, 2013 6:45 pm

Yes, LNA should be the first one but the thing is, if your LNA is designed to amplify starting not from DC but from certain frequency it may be wiser to put it after the upconverter to amplify already converted signal on the frequency that is in range of LNA.

Nelson143
Posts: 1
Joined: Wed Nov 12, 2014 8:45 am

Re: Connection order

Post by Nelson143 » Wed Nov 12, 2014 8:47 am

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