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Re: [Discuss-gnuradio] Quadrature rate question

From: Tom Rondeau
Subject: Re: [Discuss-gnuradio] Quadrature rate question
Date: Mon, 10 Dec 2012 11:28:52 -0500

On Mon, Dec 10, 2012 at 7:40 AM, Martin Braun (CEL) <address@hidden> wrote:
On Mon, Dec 10, 2012 at 01:05:13PM +0100, Martin Braun (CEL) wrote:
> On Mon, Dec 10, 2012 at 09:44:29PM +1000, Phil wrote:
> > A recent post by Markus Gonser had me intrigued and so I
> > experimented with his grc code. The resulting FM receiver does work
> > but it doesn't quite sound right. My guess is that the quadrature
> > rate is not correct at 705.6kHz. Is this the correct rate and if
> > it's not what should it be?
> That depends. The quadrature rate is the rate of the incoming I/Q sample
> stream. 705.6 kSps seems unusual, though.

Actually, it's 16*44.1kSps, which isn't that unusual. Still, you need to
get that rate at the input.


Yeah, if you're using a UHD device, you'll ask it for a specific rate. If it can get that rate, everything's fine. If you are asking it for a rate that it cannot achieve, it will give you a warning that you asked for rate X but it was actually set to rate Y. If that's the case, you'll have a sample rate mismatch between the two devices. You'll need to do some resampling to get them to match.


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