Thanks Koscher. I got a good output. I have looked Tx FFT graph (it was not applied Osmocom bandwidth, just FFT block’s graph…). I set osmocom Source’s bandwidth at Rx and I could check it was applied.
> 2015. 11. 17., 오전 10:42, Karl Koscher <[email protected]> 작성: > > Yes. Keep in mind that this only applies a final bandwidth filter in > hardware. If you are sending a signal that uses far less bandwidth than the > filter's cutoff frequency, you will not notice a difference. In your case, it > sounds like you're using a root-raised cosine filter block which will limit > the bandwidth of the signal sent to the HackRF. > > On Mon, Nov 16, 2015 at 5:25 PM, 김상혁 <[email protected] > <mailto:[email protected]>> wrote: > You mean I can control bandwidth using Osmocom sink’s bandwidth value ? > >> 2015. 11. 17., 오전 10:21, Karl Koscher <[email protected] >> <mailto:[email protected]>> 작성: >> >> When you are setting the bandwidth of the HackRF you are selecting which >> hardware filter is used. I believe if you specify a bandwidth, it needs to >> be one of the supported filter values -- 1.75, 2.5, 3.5, 5, 5.5, 6, 7, 8, 9, >> 10, 12, 14, 15, and 20 MHz. >> >> On Mon, Nov 16, 2015 at 5:10 PM, 김상혁 <[email protected] >> <mailto:[email protected]>> wrote: >> I heard HackRF One support up to 20 MHz of bandwidth. >> >> But, I can’t handle this value properly. I tried to adjust bandwidth on >> GNURadio-Companion by changing some value o >> >> 1) Osmocom sink (Ch0: Bandwidth) - It was initialized by 0 and it means >> automatic setting. I vary this value but, never effect. >> 2) Modulation (Excess BW) - It means Root-raised cosine filter excess >> bandwidth (float) and usually range of ~ 0.35. When I change this value, it >> was little effect on bandwidth(larger value is more bandwidth) >> 3) Sample rate - I found that sample rate is directly related with >> bandwidth. I tried adjust this and it was so cool. When I use large value of >> amp_rate, however, the FFT plot graph was stutter. Is it computational >> problem? >> >> I’m curious to how to control bandwidth up to 20MHz. >> >> Thanks for any reply >> >> Shawn. >> _______________________________________________ >> HackRF-dev mailing list >> [email protected] <mailto:[email protected]> >> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev >> <https://pairlist9.pair.net/mailman/listinfo/hackrf-dev> >> > >
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