Since it's AM, try shifting your center frequency by a little bit. Extract the envelope the same way, though.
My thought is the DC cancellation circuitry in the 9361 is killing your AM waveform, so use a low-IF approach instead. Brian On Sun, May 5, 2019 at 1:05 PM franz kurniawan via USRP-users < usrp-users@lists.ettus.com> wrote: > I reduced to -40db, -50db and have the same result.. > > I attached the pictures of b200mini vs other SDR with the same signal > generator.. > > I expect the same result with the 'other SDR' result.. > The IQ data of b200 is seems to be incorrect (imbalance? ) > > I have tried the uhd of these version : > v3.14.0.0-rc3 , > release_003_007_001, > release_003_010_001_000 > > But all have the same result.. > > I tried to disable the set_auto_iq_balance to both false and true, but > have no effect.. > > Thank you > > On May 5, 2019 11:27 PM, "Marcus D Leech" <patchvonbr...@gmail.com> wrote: > > -20dBM is loud. Try backing the generator down to -40dBm > > > Sent from my iPhone > > On May 5, 2019, at 12:14 PM, franz kurniawan <digitalturtle2...@gmail.com> > wrote: > > I set the generator at -20db and b200 gain at 50.. > I check that there is no cutoff at the usrp output and the input to AM > demod block.. > > Below are the setting of uhd block in gnuradio > Samp rate 500k > Output type float32 > Sync PC clock > Clock rate 10 Mhz external > Freq 121MHz > Gain 50 > Ch0 Bandwidth 200000 > > > Thank you > > On May 5, 2019 11:05 PM, "Marcus D Leech" <patchvonbr...@gmail.com> wrote: > >> What output level for the generator? What gain setting on the b205? >> >> >> Sent from my iPhone >> >> On May 5, 2019, at 11:58 AM, franz kurniawan <digitalturtle2...@gmail.com> >> wrote: >> >> So, i try to make AM receiver.. >> And the resulted demodulated audio was distorted from its original >> signal.. >> So, at this experiment i used signal generator to make AM with sine wave >> modulated signal.. >> I expect to get pure sine wave signal after AM demod process.. >> However, the sine wave is distorted as attached picture >> >> I compared with another brand SDR and can get my expected signal.. >> So i guess there is some problem with the b210mini >> >> Thank you >> >> >> >> On May 5, 2019 10:28 PM, "Marcus D. Leech via USRP-users" < >> usrp-users@lists.ettus.com> wrote: >> >> On 05/05/2019 10:53 AM, franz kurniawan via USRP-users wrote: >> >>> Dear USRP users, >>> >>> I used b210mini and encounter I/Q imbalance as below picture.. >>> As a result, the analog signal demodulation was distorted and result a >>> crappy sound.. >>> I >>> Is there any workaround regarding this issue? >>> >>> Thank you >>> >>> >>> Not sure what you mean. The I/Q seem to be about 90deg out of phase wrt >> one another, which is exactly what you'd expect. >> >> Could you describe what it is you're trying to do? Something with an >> audio demodulator? >> >> >> >> _______________________________________________ >> USRP-users mailing list >> USRP-users@lists.ettus.com >> http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >> >> >> <IMG-20190505-WA0001.jpg> >> >> > _______________________________________________ > USRP-users mailing list > USRP-users@lists.ettus.com > http://lists.ettus.com/mailman/listinfo/usrp-users_lists.ettus.com >
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