---------- Forwarded message ---------- From: Matteo Terzi <matteo.terz...@gmail.com> Date: 2018-05-09 9:28 GMT+02:00 Subject: Re: [Hackrf-dev] Low pass filter lesson 1 To: Chuck McManis <chuck.mcma...@gmail.com>
Hi Chuck, could you explain me better? Sorry but I don't understand why I should mix the signal. I'm a newcomer with GNU Radio. If you can, give me a website where I can find something more. Thanks for the support Matteo 2018-05-09 0:22 GMT+02:00 Chuck McManis <chuck.mcma...@gmail.com>: > Hi Matteo, > > It is the difference between "baseband" and "RF". If you take an RF signal > that is at 100Mhz and has a bandwidth of 2.5Khz, you can mix it with > another signal at 100Mhz and that will produce two outputs, one at 200Mhz, > and one at 0Mhz. It will still have a 2.5Khz bandwidth so on the low end it > will be between 0 and 2.5kHz so a low pass filter is needed. > > This is the fundamental principle behind radios. > > --Chuck > > > On Tue, May 8, 2018 at 5:59 AM, Matteo Terzi <matteo.terz...@gmail.com> > wrote: > >> Hi all, >> I'd like to know why does Micheal Ossmann use a Low Pass Filter in the >> Lesson 1 (https://greatscottgadgets.com/sdr/1/ --> minute 22:00). >> He says that in that way just frequencies near to the zero Hz can pass >> but it doesn't make sense....how radio frequencies can pass if they have a >> value of MHz?? >> Thanks >> >> Matteo >> >> -- >> Matteo TERZI >> Google Gmail Member >> >> _______________________________________________ >> HackRF-dev mailing list >> HackRF-dev@greatscottgadgets.com >> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >> >> > -- Matteo TERZI Google Gmail Member -- Matteo TERZI Google Gmail Member
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