[hpsdr] Mercury 2.6

[Doug Bade]

The Atom 330 intel mini itx boards all seem to do it....at least 
those of us running the HPSDR this way who have compared notes find 
this.. Even 96K at 2048 no longer works it distorts as he describes.. 
interestingly the CPU load is only about 12-18 % even when it is 
popping and distorting... I have had to drop to 96k 1024 to get it to 
work 99% as it still pops once in a while.. 96k 512 is good audio but 
cpu load starts climbing..... Not complaining but it has gotten worse 
with later releases of code. Would it help to have one of these 
boards shipped to one of you for tests??? they are not real 
expensive....and small enough to ship cheap..

I would volunteer mine as you have your own Mercury etc... :-) The 
board runs on 160w ps so about anything you have laying around runs it...

Doug
KD8B


At 07:05 PM 2/16/2009, Phil Harman wrote:
>***** High Performance Software Defined Radio Discussion List *****
>
>
>Hi Jeff,
>
>Thanks for your tests.  We are working hard on tracking down the 
>reason for the popping at 192k and 2048 buffer. Neither Bill, 
>KD5TFD, nor I can reproduce the problem which makes fixing it a little harder.
>
>I've never been able to run at 192k with 256 buffers with any 
>version of the code.
>
>73's Phil...VK6APH
>
>
>
>
>Quoting Jeff Cook <jeffrie at talktalk.net>:
>
>>***** High Performance Software Defined Radio Discussion List *****
>>
>>These are my observations regarding Mercury 2.6
>>
>>                                              _Primary_
>>
>>Sample Rate             Buffer Size                    Result
>>
>>192,000                         2048
>>      Popping
>>
>>192,000                         1024
>>      Good
>>
>>192,000                         512
>>       Good
>>
>>192,000                         256
>>       Break up
>>
>>
>>                                                _VAC_
>>
>>192,000                         2048
>>      Gross Distortion
>>
>>192,000                         1024
>>      Popping
>>
>>192,000                         512
>>       popping
>>
>>192,000                         256
>>       Gross Breakup
>>
>>96,000                           Any
>>       Good
>>
>>In my view HPSDR is the best thing to happen in ham radio for years.
>>It, together with the software offers a degree of control that I've 
>>never experienced in a radio before.
>>
>>Jeff Cook G0AFQ.
>>
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>
>
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