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Re: [Discuss-gnuradio] How to retune a daughterboard/bring up the sample

From: Josh Blum
Subject: Re: [Discuss-gnuradio] How to retune a daughterboard/bring up the sample rate on USRP?
Date: Tue, 28 Jun 2011 18:34:52 -0700
User-agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv: Gecko/20110516 Lightning/1.0b2 Thunderbird/3.1.10

On 06/28/2011 06:29 PM, Marcus D. Leech wrote:
> On 06/28/2011 08:27 PM, Josh Blum wrote:
>> You should be able to re-adjust the digital frequency shift very
>> quickly, which can go +/- 32MHz. On USRP1, this is implemented in the
>> DAC (not the FPGA DSP). You can do this w/ tune_request_t in uhd, no
>> idea about libgnuradio-usrp
>> -Josh
> This raises an interesting question--is "advanced" tune_request_t
> 'exposed' to GRC?   When I looked recently, it didn't look like it.

Yes. But from grc, there isnt a convenience constructor and it can be
hard to fill out struct members. But you could make a module with a
function that produces the request struct from parameters (or just add
it to the gr-uhd swig __init__.py).


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