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Re: [Discuss-gnuradio] How quickly can I retune?

From: Andrew Lutomirski
Subject: Re: [Discuss-gnuradio] How quickly can I retune?
Date: Wed, 5 Aug 2009 16:40:41 -0400

If, however, you want to retune without stopping and restarting
sampling or having underruns, I know how to do it and can explain /
send patches (for C++ -- I never bothered implementing the Python

In my experience, it takes a second or two before the local oscillator
on the TVRX really settles down.

Eric et al: I have some patches to the FPGA code that allow pausing
sampling for a predetermined number of samples (so you can retune
without losing track of time) and to improve the DDC startup behavior
a little (some state was leaking across runs, but I haven't gotten it
fully fixed).  Want them?


On Wed, Aug 5, 2009 at 4:19 PM, Eric Blossom<address@hidden> wrote:
> On Wed, Aug 05, 2009 at 04:03:28PM -0400, Jonathan Coveney wrote:
>> I'm using the TVRX, and my goal is to be able to take enough samples to
>> listen to two arbitrary frequencies (more than 6MHz apart). Given that the
>> bandwidth of the TVRX is 6MHz, I think that means I need 12Msamples/second
>> (I can do up to 32?). So for 2, that would mean 24Msamples per
>> second...would it be possible to retune the device in between each sample?
>> Or would this be impossible?
>> Thanks
>> -Jonathan
> The TVRX takes on the order of 100ms to tune.  If you want two
> arbitrary frequencies (more than 6 MHz apart), you'll need two TVRX's.
> Eric
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