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

Sat Mar 18 14:18:04 EDT 2017

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> 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> on behalf of Simon Kennedy <simon at thekennedys.info>
Date: Tuesday, March 14, 2017 at 1:35 AM
To: hackrf-dev <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> wrote:

On 13 March 2017 at 13:09, mohammed hamoud alkindy <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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