Re: [Discuss-gnuradio] IF value of the RF front end

2012-07-12 Thread Jamie Wo
Thanks a lot, guys. I got it. Best Regards, Jamie On Wed, Jul 11, 2012 at 10:56 PM, Ed Criscuolo wrote: > Broadcast FM has a channel bandwidth of 150 kHz, so a sampling rate of 200 > or 256 ksps should work fine. Don't confuse the sampling rate of the > zero-IF data with the sampling rate of t

Re: [Discuss-gnuradio] IF value of the RF front end

2012-07-11 Thread Ryan Connelly
I think I can clarify things a bit. The WBX and SBX default to what is called direct conversion or homodyne mixing (see http://en.wikipedia.org/wiki/Direct-conversion_receiver). I'm not sure about this, but also if you offset the LO as per Nick's link, you effectively make those boards do superhete

Re: [Discuss-gnuradio] IF value of the RF front end

2012-07-11 Thread Ed Criscuolo
Broadcast FM has a channel bandwidth of 150 kHz, so a sampling rate of 200 or 256 ksps should work fine. Don't confuse the sampling rate of the zero-IF data with the sampling rate of the front-end, which is 64 msps (USRP1) or 100 msps (USRP2). The UHD API tends to hide this. In the old classic

Re: [Discuss-gnuradio] IF value of the RF front end

2012-07-11 Thread Jamie Wo
Hi Nick, Thanks for your reply. But I am not sure whether I understand what you said. My understanding is that the WBX converts RF signal into baseband signal directly, while for TVRX2, the RF signal is converted into low IF signal firstly by TVRX2 and then converted into basebad signal by USRP's

Re: [Discuss-gnuradio] IF value of the RF front end

2012-07-10 Thread Nick Foster
Jamie, WBX is a direct-conversion receiver, meaning there is no IF: it is a quadrature receiver where the LO frequency is equal to the RF frequency. TVRX2 is a low-IF receiver using a 12.5MHz IF. Both daughterboards can be treated as zero-IF direct conversion receivers for tuning purposes, as th

[Discuss-gnuradio] IF value of the RF front end

2012-07-09 Thread Jamie Wo
Hi all, As far as I know the maximum sampling rate for USRP N210 is 25M sps. To receive signal with high frequency, such as 300 MHz to 2.2 GH, the RF front end converts the RF into IF, so the ADC can sample the IF signal. My question is what the IF value is for daughter-board WBX? Where can I re