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Re: [Discuss-gnuradio] Gain ahead of Basic RX?

From: John Ackermann N8UR
Subject: Re: [Discuss-gnuradio] Gain ahead of Basic RX?
Date: Mon, 01 Jan 2007 16:17:40 -0500
User-agent: Thunderbird (X11/20061115)

Matt Ettus said the following on 01/01/2007 03:52 PM:
> Using an BasicRX on a USRP with the PGA turned all the way (+20dB) up is
> roughly like having a 35dB noise figure.  Based on that and your desired
> system noise figure, you can tell how much gain you need ahead of it. 

Thanks, Matt.  So it looks like 20+dB gain would be desired, at least
for the higher bands.  One version of the amp chip I'm using (a
Mini-Circuits 3rd generation monolithic amp called a "GALI") has about
25dB gain, 2.6dB noise figure, and an IP3 output of +37dBm (so about
+12dBm input).  Looks like that may do the trick.


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