[USRP-users] LFTX output amplitude (Michael Rahaim)
rfengr00 at me.com
Thu Dec 11 09:08:53 EST 2014
Ok what you are describing is the phase accumulator halting to a non zero state when you tune the oscillator back to 0 Hz. Try generating a very low frequency sine wave (a few Hz) and you see what I mean when you tune it away from 0 Hz and then return it. When you start you flow with a 0 Hz source, the accumulator is initialized to zero, then it starts accumulating when you tune it to some frequency. Return it to 0 Hz and it stops at a non-zero phase, which is equivalent to a DC offset. I'm sure this is the way it is supposed to work, and is what I have observed before.
> On Dec 11, 2014, at 07:21, Michael Rahaim <mrahaim at bu.edu> wrote:
> Hi Lou,
> I have the output of the LFTX connected to a scope. I'm not using the LFRX in the test loop.
>> On Wed, Dec 10, 2014 at 7:44 PM, Louis Brown via USRP-users <usrp-users at lists.ettus.com> wrote:
>> How are you measuring the LFTX output? With additional test equipment or looping it back into the LFRX?
>> USRP-users mailing list
>> USRP-users at lists.ettus.com
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