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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 1.5.0.8 (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.
John