[Hackrf-dev] Duff Samples ?

[Simon Brown]

Hi,

Adding support for the hackRF was simple, very, very simple. A few minor
things to do after I sleep off my liquid lunch and a few of my test team can
play...

Simon Brown G4ELI
http://v2.sdr-radio.com


-----Original Message-----
From: Michael Ossmann [mailto:mike at ossmann.com] 
Sent: 16 August 2014 15:04
To: Simon Brown
Cc: hackrf-dev at greatscottgadgets.com
Subject: Re: [Hackrf-dev] Duff Samples ?

Oh, good!  I was quite puzzled by the problem when I read your first email.
It's possible that the interference from the radar is being made worse by
the RF amplifier if you have that turned on (hackrf_set_amp_enable()).  That
amp is useful for picking up weak signals, but it can be overpowered by
strong signals.

I'm not sure I've ever been accused of writing a clear, easy to use API, but
thank you.  It is likely the fault of another developer on the team.
:-)

Mike


On Sat, Aug 16, 2014 at 11:32:53AM +0100, Simon Brown wrote:
>
> And the good news - forcing a narrow bandwidth filter clears it up, 
> looks like I'm being clobbered by military radar from time to time.
> 
>  
> 
> Panic over, move along please, nothing to see here.
> 
>  
> 
> Simon Brown G4ELI
> http://v2.sdr-radio.com
> 
>  
> 
> From: HackRF-dev [mailto:hackrf-dev-bounces at greatscottgadgets.com] On 
> Behalf Of Simon Brown
> Sent: 16 August 2014 10:52
> To: hackrf-dev at greatscottgadgets.com
> Subject: [Hackrf-dev] Duff Samples ?
> 
>  
> 
> Hi Mike,
> 
>  
> 
> First - as a developer I must say 'thank-you' for a very easy to use 
> API with clear, simple examples. It took less than one day to get 
> Stereo FM reception working, just a shame about my tinnitus L.
> 
>  
> 
> Anyway this morning I finished the hackRF implementation in my own 
> Windows code. At 8 Msps sample rate it's absolutely fine, doing a 
> grand job. With any higher sample rate (even 10 Msps) the data flows 
> at the expected rate, but the samples aren't as 'good'. The FFT shows 
> this - the same signals are present but not as clear, demodulating
Broadcast FM is very muffled.
> 
>  
> 
> I've checked my code left, right & center and am sure I'm not doing 
> anything stupid (I can really screw up code without trying). I tried 
> two hackRF devices, both returned identical results.
> 
>  
> 
> Am I losing the plot?
> 
>  
> 
> From my logfile:
> 
>  
> 
> 09:53:54>     Board ID Number .: 2, HackRF One
> 
> 09:53:54>     Part ID Number ..: 0x00574347 0x00574347
> 
> 09:53:54>     Serial Number ...: 0x00000000 0x00000000 0x457863C8
0x2F48131F
> 
> 09:53:54>     Firmware ....... : git-44df9d1
> 
>  
> 
> Simon Brown G4ELI
> http://v2.sdr-radio.com
> 
>  
> 

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