[Hackrf-dev] Bandwidth control

[Karl Koscher]

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 <tkdgur7896 at gmail.com> wrote:

> You mean I can control bandwidth using Osmocom sink’s bandwidth value ?
>
> 2015. 11. 17., 오전 10:21, Karl Koscher <supersat at cs.washington.edu> 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 <tkdgur7896 at gmail.com> 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
>> HackRF-dev at greatscottgadgets.com
>> https://pairlist9.pair.net/mailman/listinfo/hackrf-dev
>>
>
>
>
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