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Re: [Discuss-gnuradio] LFRX Gain settings
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From: |
Johnathan Corgan |
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Subject: |
Re: [Discuss-gnuradio] LFRX Gain settings |
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Date: |
Mon, 10 Sep 2007 08:14:57 -0700 |
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User-agent: |
Thunderbird 1.5.0.13 (X11/20070824) |
Ed Criscuolo wrote:
> Anyone know what the allowable gain settings are when using the USRP
> with the LFRX daughterboard? I believe I read somewhere that 20 is
> the default and units are dB, but what are the min/recommended/max
> values? I tried digging them out of usrp1_source_c.cc,
> usrp1_source_base.cc, and usrp_standard.cc (all from rel 3.0.3) but
> had no luck.
The allowable gain range for the LFRX is 0 to 20.
The LFRX board has no inherent gain itself; what you are actually
adjusting is the programmable gain amplifier at the input to the
motherboard AD9862 ADC. You are setting the ADC full-scale value to 2V
p-p when gain is set to 0, and at 0.2V p-p when gain is set to 20.
--
Johnathan Corgan
Corgan Enterprises LLC
http://corganenterprises.com