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Re: [Discuss-gnuradio] Bandpass Sampling

From: Richard Bell
Subject: Re: [Discuss-gnuradio] Bandpass Sampling
Date: Mon, 8 Dec 2014 11:57:25 -0800

I think Marcus answered my question. Thank you.

On Mon, Dec 8, 2014 at 11:53 AM, Richard Bell <address@hidden> wrote:
I'm apologize. I am using a WBX card.

I forgot to mention that I've been looking for a datasheet for the WBX, but all I can find is the PCB schematic doc on the ettus website which isn't very useful. So I don't know what the IF frequency coming out of the WBX is. Does the WBX tune itself given the UHD source settings so that the IF it produces is proper for the USRP ADC?


On Mon, Dec 8, 2014 at 11:28 AM, <address@hidden> wrote:

The N2xx series use a fixed sample rate, so there's no "deciding what sample rate to use based on Fc".

There's also the analog bandwidth of the ADC to consider.  If you aren't going to use a downconverter card, then the analog bandwidth of the ADC will start to roll-off at some point, so even if you narrowband filter your input signal to remove aliasing possibilities, you will end up in the roll-off skirts of the analog bandwidth of the ADC.

Is there some reason not to use a downconverter card, like the WBX for your application?




On 2014-12-08 14:23, Richard Bell wrote:

I have a binary FSK signal centered at 300 MHz with 160 kHz offset peaks from the center freak. Therefore the lowest signal frequency of interest is 300-0.16 = 299.84 MHz and the highest is 300.16 MHz.

I know the maximum sampling rate of the USRPN210 ADC is 100 MSPS. If the USRP uses that sample rate of 100 MSPS, it will alias my signal onto itself in an unwanted manor.

My question is, how does the USRPN210 decide what sample rate to set the ADC to? Is it a function of both the center frequency and the sample rate setting of the UHD source block?


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