[Hackrf-dev] not so good experience for my first SDR

[Cinaed Simson]

Incidentally, please post the output of

  hackrf_info

The firmware and the libraries must match otherwise the results can be
unpredictable.

Also, please indicate which version of GNU radio and gqrx you're using.

And note, I don't really know what you mean by a new Mac Pro - I don't
know if it's old model but new to you or if it's the latest model - an
Intel 2.9 GHz Core i5. So please indicate the model.

-- Cinaed


On 03/18/2017 11:18 AM, mohammed hamoud alkindy wrote:
> Thank you all for the support, it seems I am trying things without any
> improvement, changing sampling rates give me strange error messages no
> matter what rate I put:
> 
>  
> 
> Failed to set RX input rate to 8e+07
> 
> Your device may not be working properly.
> 
> The same with other lower rates
> 
>  
> 
> Regards
> 
>  
> 
>  
> 
> *From: *Chuck McManis <chuck.mcmanis at gmail.com>
> *Date: *Tuesday, March 14, 2017 at 10:13 PM
> *To: *Mohammed AlKindy <mohammed at omantel.net.om>
> *Cc: *Simon Kennedy <simon at thekennedys.info>, hackrf-dev
> <hackrf-dev at greatscottgadgets.com>
> *Subject: *Re: [Hackrf-dev] not so good experience for my first SDR
> 
>  
> 
> Reading this it sounds like there is a misunderstanding here.
> 
>  
> 
> If you have sampling issues you will get an *underrun* not an *overrun*. 
> 
>  
> 
> If you are getting an *overrun* between the HackRF and your audio card
> then you need to put a sample decimeter between them. You can slow the
> 'output' samples from a decimeter block arbirarily down. In other words
> you could sample the HackRF at 20Mhz and decimate it by 200,000 and the
> output would be 1,000 samples per second (very slow). 
> 
>  
> 
> If you are getting OVERRUNs add more decimation
> 
> if you are getting UNDERRUNs then increase the sample rate.
> 
>  
> 
> --Chuck
> 
>  
> 
>  
> 
> On Tue, Mar 14, 2017 at 11:03 AM, mohammed hamoud alkindy
> <mohammed at omantel.net.om <mailto:mohammed at omantel.net.om>> wrote:
> 
>     Actually the lowest rate seating I could set is 8000000 but still
>     getting the over run I will try to check how to change the audio
>     setting to 44.1khz as it show me now it is at 45khz as my card is
>     now set to 44.1khz but I do not know how to change it on my mac yet
> 
>      
> 
>     *From: *HackRF-dev <hackrf-dev-bounces at greatscottgadgets.com
>     <mailto:hackrf-dev-bounces at greatscottgadgets.com>> on behalf of
>     Simon Kennedy <simon at thekennedys.info <mailto:simon at thekennedys.info>>
>     *Date: *Tuesday, March 14, 2017 at 1:35 AM
>     *To: *hackrf-dev <hackrf-dev at greatscottgadgets.com
>     <mailto:hackrf-dev at greatscottgadgets.com>>
>     *Subject: *Re: [Hackrf-dev] not so good experience for my first SDR
> 
>      
> 
>     On gqrx choose menu option 'I/O Devices' then change Input Rate to a
>     low rate like 1000000 to change the sample rate to 1 Msps (bandwidth
>     of 1 MHz). Even my Intel Atom powered netbook will work with this
>     sample rate. My quad core i5-2400 handles 20 Mbps (20 MHz bandwidth)
>     well. Once you find a sample rate that works you can increase it
>     until you reach the limit of you processing power.
> 
>      
> 
>     On 13 March 2017 at 19:11, Dominic Spill <dominicgs at gmail.com
>     <mailto:dominicgs at gmail.com>> wrote:
> 
>         On 13 March 2017 at 13:09, mohammed hamoud alkindy
>         <mohammed at omantel.net.om <mailto:mohammed at omantel.net.om>> wrote:
>         >
>         > Yes I use gqrx and watched the lessons from greatscottgadgets.
>         if gqrx could allow to introduce throttling I would hsve test it
>         but could not see such feature
> 
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> 
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>  
> 
> 
> 
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