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Re: [Discuss-gnuradio] Noise floor and Rx Gain

From: Matt Ettus
Subject: Re: [Discuss-gnuradio] Noise floor and Rx Gain
Date: Sat, 23 Jan 2010 13:45:34 -0800
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On 01/23/2010 01:28 PM, Yong J. Chang wrote:


Thanks for your great answer Matt. I have another quick question.
We know that the controllable range of rx-gain is 0 to 90dB in RFX-2400
d'board.
But I only can find a programable gain amplifier in ADC chip whose range is
0 to 20dB.
Where is the received signal actually amplified according to the 'rx_gain'
value?
Yes. There is a 70dB analog programmable gain amplifier in the Quadrature Demodulator chip, the AD8347. 

Matt
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