Also: The BasicTX's source impedance is 50Ω; make sure you properly terminate either by setting your scope to 50Ω or by measuring with a high scope impedance over a 50Ω resistor.
Best regards, Marcus On 12/23/2016 10:50 PM, Marcus D. Leech wrote: > On 12/23/2016 01:45 PM, Michael Skaggs wrote: >> 1 MHz signal with a 6.25MSps rate. We just attempted a signal at 5MHz >> and measured it at 114mV RMS, a 10MHz signal is 56mV RMS. The voltage >> seems to drop as the signal frequency rises. Does this assure a >> hardware issue? Or is there something else we can check? >> >> Thanks, >> Michael > Thing is, there's not that much that can go wrong with a BASIC_TX. > It's all passives. > > What version of UHD are you using? > > >> >> On Fri, Dec 23, 2016 at 10:44 AM, Marcus D. Leech <mle...@ripnet.com >> <mailto:mle...@ripnet.com>> wrote: >> >> On 12/23/2016 10:26 AM, Michael Skaggs wrote: >>> Hi all, >>> >>> We're currently working with a BasicTX daughterboard attached to >>> a N210 USRP. We are using both outputs of the BasicTX in >>> quadrature (I on one channel, Q on the other). The problem we >>> are running into is that the output power of the BasicTX board >>> seems very low. Looking at it on an o-scope, we are seeing >>> around 166mV RMS on each channel, which seems lower than we >>> would expect. >>> >>> We are using GNURadio Companion to transmit these waveforms, and >>> it is a very simple setup. A single "Signal Source" block >>> generating a sine wave into a "UHD: USRP Sink" block. The >>> "amplitude" value is at it's near max without clipping in the >>> ADC and since the daughterboard has no gain elements, "gain" >>> does nothing, so we're kind of at a loss here. >>> >>> Any help is appreciated. >>> >>> Thanks, >>> Michael >>> >>> >>> _______________________________________________ >>> Discuss-gnuradio mailing list >>> Discuss-gnuradio@gnu.org <mailto:Discuss-gnuradio@gnu.org> >>> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >>> <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> >> What frequency? >> _______________________________________________ Discuss-gnuradio >> mailing list Discuss-gnuradio@gnu.org >> <mailto:Discuss-gnuradio@gnu.org> >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio >> <https://lists.gnu.org/mailman/listinfo/discuss-gnuradio> >> >> _______________________________________________ >> Discuss-gnuradio mailing list >> Discuss-gnuradio@gnu.org >> https://lists.gnu.org/mailman/listinfo/discuss-gnuradio > > _______________________________________________ > Discuss-gnuradio mailing list > Discuss-gnuradio@gnu.org > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
