[hpsdr] New Code and Distortion -tnx

[Riho B., ES7AAZ]

Hi,

mic input of Penelope is distorted as well with new code.
There is also about 3dB gain decrease compared to earlier
version (at least through VAC).

73,
Riho, ES7AAZ.


73,
Riho, ES7AAZ.

Phil Harman wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> 
> Ben,
> 
> Good to hear the latest code has fixed your issues.
> I can see the distortion on a 'scope connected to the audio output of 
> Mercury.
> 
> We are working on the fix.
> 
> 73's Phil...VK6APH
> 
> 
> ----- Original Message ----- From: "W4sc" <w4sc at windstream.net>
> To: <hpsdr at lists.openhpsdr.org>
> Sent: Friday, June 12, 2009 8:28 PM
> Subject: Re: [hpsdr] New Code and Distortion -tnx
> 
> 
>> ***** High Performance Software Defined Radio Discussion List *****
>>
>> I too can confirm improvement form totaly unusable to very good.
>> Previously had severe audio distortion, and what sounded like "FM-ing" on
>> rx signals, decreasing with "wamup". All boards (Ozy, Penelope, and 
>> Merc.)
>> have C8N grade asic mounted in 3 slot Atlas.  Still, I also notice
>> occasional audio HF distortion on some signals.  Only additional 
>> filtering
>> in front is high pass to keep local AM stations out. Still a big "door".
>>
>> Good work and thanks to all involved in resolution of the problem.
>>
>> 73 de Ben W4SC
>>
>> <snip>
>>
>>> ***** High Performance Software Defined Radio Discussion List *****
>>>
>>> I can confirm that the new FPGA code works from a cold start. Woot!  I
>>> can
>>> also confirm that there is a new "high frequency" audio distortion on
>>> some
>>> received signals. It seems to be relative to signal strength (e.g. the
>>> higher the signal strength level the more likely there is 
>>> distortion.  It
>>> appears to be an issue with Rx ALC.
>>>
>>> Best 73's,
>>> Dan (N7HQ)
>>>
>>
>> <snip>
>>
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> 
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