>> Output power is determined largely by baseband signal magnitude in that case. Yes, I understand. And I noticed that for baseband signal with an amplitude *> 1, * the pass-band signal gets clipped off. So I assume that an amplitude of 1 for the baseband signal should deliver the maximum output power (for the pass-band signal).
My question was, what is the maximum power one can get for the pass-band signal output from LFTX? In your earlier reply, you said it is around +7dBm, am I getting this right? In my case, for a baseband amplitude of around 1, I am only getting *-28.13dBm*, much less than what you said, I am not sure,* why?* Thanks, Khalid On Tue, Jan 6, 2015 at 1:56 PM, Marcus D. Leech <mle...@ripnet.com> wrote: > Thanks Marcus for your reply. > > >> Probably somewhere in the neighborhood of +7dBm, maybe a little more. > > >> The LF/BASIC series have *no* gain in either path, so you're just > looked > at buffered ADC ouput. > > So, ~ *+7dBm* is the max output power I supposed to get from the LFTX > daughterboard? How do I get that? > > Since I am only getting -28.13 dBm, does that mean I have some issue with > my LFTX daughterboard? > > > Khalid > > > Output power is determined largely by baseband signal magnitude in that > case. > > > > > > > > > > Message: 2 > Date: Tue, 6 Jan 2015 10:13:45 -0330 > From: "khalid.el-darymli" <khalid.el-dary...@mun.ca> > To: "Discuss-gnuradio@gnu.org" <discuss-gnuradio@gnu.org> > Subject: [Discuss-gnuradio] Max Output Power from the LFTX > daughterboard > Message-ID: > <CACdmG=zCHATiwrtv=wBVLwG0_ > 5GQr0y=wksequrcajrtuv5...@mail.gmail.com> > Content-Type: text/plain; charset="utf-8" > > Hi, > > What is the maximum output power from the LFTX daughterboard when used with > the USRP N200? > > According to this datasheet [1], the N200 with the WBX daughterbaord > provide an output power of 15 dBm. However, when using the LFTX > daughterboard, I am getting a much less output power. > [1] > http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf > > In GNU Radio with the USRP N200, we use a sinusoid with a frequency of 150 > kHz and an amplitude of 0.98, fed into the LFTX daughterboard for a center > frequency of 5 MHz. When the output of LFTX is plugged into a scope > terminated with a 50-ohm terminator, the scope reads 24.8 mV > (peak-to-peak). This is around -28.13 dBm. > > Is this the max power one can get out of the LFTX daughterboard? > > > Thanks. > > Best regards, > Khalid > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://lists.gnu.org/archive/html/discuss-gnuradio/attachments/20150106/37846ff4/attachment.html > > > > ------------------------------ > > Message: 3 > Date: Tue, 06 Jan 2015 08:48:08 -0500 > From: "Marcus D. Leech" <mle...@ripnet.com> > To: discuss-gnuradio@gnu.org > Subject: Re: [Discuss-gnuradio] Max Output Power from the LFTX > daughterboard > Message-ID: <54abe798.5060...@ripnet.com> > Content-Type: text/plain; charset=UTF-8; format=flowed > > On 01/06/2015 08:43 AM, khalid.el-darymli wrote: > > Hi, > > > > What is the maximum output power from the LFTX daughterboard when used > > with the USRP N200? > > > > According to this datasheet [1], the N200 with the WBX daughterbaord > > provide an output power of 15 dBm. However, when using the LFTX > > daughterboard, I am getting a much less output power. > > [1] > > http://www.ettus.com/content/files/07495_Ettus_N200-210_DS_Flyer_HR.pdf > > > > In GNU Radio with the USRP N200, we use a sinusoid with a frequency of > > 150 kHz and an amplitude of 0.98, fed into the LFTX daughterboard for > > a center frequency of 5 MHz. When the output of LFTX is plugged into a > > scope terminated with a 50-ohm terminator, the scope reads 24.8 mV > > (peak-to-peak). This is around -28.13 dBm. > > > > Is this the max power one can get out of the LFTX daughterboard? > > > > > > Thanks. > > > > Best regards, > > Khalid > Probably somewhere in the neighborhood of +7dBm, maybe a little more. > > The LF/BASIC series have *no* gain in either path, so you're just looked > at buffered ADC ouput. > > > > -- > Marcus Leech > Principal Investigator > Shirleys Bay Radio Astronomy Consortium > http://www.sbrac.org > > > > -- > Marcus Leech > Principal Investigator > Shirleys Bay Radio Astronomy Consortiumhttp://www.sbrac.org > >
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