On 9 May 2018 at 01:29, Matteo Terzi <[email protected]> wrote: > > 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.
Some of these concepts are explained in later videos in Mike's series, so they may offer the explanation that you're looking for. > 2018-05-09 0:22 GMT+02:00 Chuck McManis <[email protected]>: >> >> 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 <[email protected]> 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 >>> [email protected] >>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >>> >> > > > > -- > Matteo TERZI > Google Gmail Member > > > > -- > Matteo TERZI > Google Gmail Member > > _______________________________________________ > HackRF-dev mailing list > [email protected] > https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >
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