Re: [Discuss-gnuradio] USRP1+external VUHF Tuner and C++ Interface

[Luca Pascale]

Hi Eric,
thanks for your reply.
Now seems work something more.
Next Two things I have to investigate are :
1) I have a tone in the middle of the spectrum regardlss of the input
signal. What should be ?
2)db->is_quadrature()  return true. What does it exactly means ? (i set
urx->set_format(0x00000300)-default).

Thanks again,
Luca



Eric Blossom wrote:
> 
> On Wed, Jul 29, 2009 at 02:31:12PM -0700, Luca Pascale wrote:
>> 
>> Hi all,
>> 
>> I am trying to use USRP1 with an external Tuner using the C++ USRP
>> interface
>> example founded on the wiki.
>> The Tuner have a 16 MHz BW centered at 21.4MHz IF.
>> I have connected it (passing through a passband filter centered @21.4M
>> and
>> 16M wide) to USRP using the BasicRX daughterboard. I have some doubt
>> about
>> this setup.
>> 
>> A) Do I need to control in someway (by a "driver") the doughterboard?
>> 
>> B) How should I have to set the DDC freq ( set_rx_freq() ) to get
>> correctly
>> the signals around the 21.4M IF ?
>>   
>> Thanks in advance,
> 
>   usrp_tune_result r;
>   bool ok = u->tune(0, db, 21.4e6, r);
> 
> Eric
> 
> 
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> 

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