Re: [Discuss-gnuradio] UCLA Zigbee PHY examples updated for UHD

[Kresimir Dabcevic]

update: turns out the problem was power squelch block - connecting self.u directly to self.packet_receiver did the trick...


-----Original Message-----
From: Kresimir Dabcevic
Sent: Mon 5/23/2011 12:03 PM
To: address@hidden; address@hidden
Subject: RE: [Discuss-gnuradio] UCLA Zigbee PHY examples updated for UHD

>
>Thanks for the reply Josh.
>
>However, I'm confused by all the frequency setting/tuning functions at our disposition. In my example,
>1)I am setting cordic-freq (set by parser) while calling the main program, e.g. -c 2450000000 -that's the frequency I want to set my USRP to.
>
>2)output of
>self.u.set_center_freq(options.cordic_freq, 0)
>print "Center frequency: %d" %(self.u.get_center_freq())
>is:
>Center frequency: 2450000000
>
>3)output of
>uhd.tune_request(options.cordic_freq, 0)
>print "Center frequency: %d " %(self.u.get_center_freq())
>print ("%s") %(uhd.tune_result())
>is:
>Center frequency: 2600000000
>Tune Result:
>    Target RF  Freq: 0.000000 (MHz)
>    Actual RF  Freq: 0.000000 (MHz)
>    Target DSP Freq: 0.000000 (MHz)
>    Actual DSP Freq: 0.000000 (MHz)
>
>Why is uhd.tune_request setting the center frequency to 2.6 instead of 2.45 GHz?
>Also, am I calling the uhd.tune_result function wrong - why are all the values 0?
>Furthermore, what is the difference between self.u.set_center_freq(options.cordic_freq,0).actual_rf_freq and self.u.set_center_freq(options.cordic_freq,0) >functions?
>
>Regards,
>Kresimir

-----Original Message-----
From: address@hidden on behalf of Josh Blum
Sent: Mon 5/23/2011 12:54 AM
To: address@hidden
Subject: Re: [Discuss-gnuradio] UCLA Zigbee PHY examples updated for UHD
>>>
>>>
>>> Blocked waiting for GDB attach (pid = 5466)
>>> Press Enter to continue:
>>> cordic_freq = 2.45G
>>>

>> Not sure whats wrong, but, cordic_freq should be the error in tuning the
>> RF center freq, so only a few kHz really. That may be a good place to
>> start looking.
>>
>> -josh

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