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Re: [Discuss-gnuradio] RA:FFT

From: Marcus D. Leech
Subject: Re: [Discuss-gnuradio] RA:FFT
Date: Tue, 29 Dec 2015 13:30:22 -0500
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.7.0

On 12/29/2015 01:01 PM, Simon Olvhammar wrote:

I have a question regarding the block RA:FFT in the RA Blocks package.
If I set, for example, the decimation at 100 does this mean that only 1 in 100 items will be kept? In that case it would occur to me if, I do say a measurement of 100 minutes at a signal, I only get 1 minute of data?

Best regards

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No, the decimation is applied to FFT *output* frames, after integration. It is typically the case that in radio astronomy spectrometry that you integrate spectra over some time period, since the SNR is typically quite poor.

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