[hpsdr] No smoke! (but distorted audio)

[Graham / KE9H]

Paul:

It could be a couple of things. Likely not shielding or your grounding.

A low performance computer can get overloaded by processing and leave a lot
of audio gaps, or you could be hearing what a marginally locked or unlocked
clock recovery sounds like (crackling sound).

If a crackling sound...
If you are running just Ozy and Mercury, put them in adjacent slots on the
bus. Do NOT take out jumper J8 on Mercury. Make sure Mercury is selected as
the source of both 10 MHz and 122.88 MHz clocks at SetUp->General->HPSDR.
 If still present, go to the SVN...
\repos_sdr_hpsdr\trunk\USBBlaster-Binaries
and follow the instructions in the ReadMe to upgrade the firmware in
Mercury to version 2.4.

If repetitive gaps in audio...
Usually a computer with marginal horsepower.
Stop all applications on your computer, other than PowerSDR.
Make sure Sample size under SetUp->Audio is set to maximum size (2048).
If that doesn't work, , go to the SVN...
\repos_sdr_hpsdr\trunk\USBBlaster-Binaries
and follow the instructions in the ReadMe to upgrade the firmware in
Mercury to version 2.4.
Then, set "sample rate" at SetUp->Audio is set to 48000, for minimum CPU
loading.

--- Graham / KE9H

==


Paul Beckmann wrote:
> ***** High Performance Software Defined Radio Discussion List *****
> Well, I jumped the Tortoise/svn, USBIO, and board power-up hurdles tonight with Atlas, Ozy, and Mercury and actually heard WWV and some CW on 80 meters. Understand that I have the Atlas just sitting on a piece of paper with the boards plugged in, an old Dell supply sitting right next to it, and the board only grounded through the PS and the 3rd wire of the power cord.
>   
> What I did notice, however, was very distorted audio, scratchy. 
> (Actually it sounded a lot like a 10GHz rainscatter signal!) Is this 
> to be expected with the entire lack of shielding or would the gurus of 
> the group expect something isn't quite functioning properly? (I do 
> have extensive static control devices on the antenna and was careful 
> to discharge potential static on the P.S. chassis every time I wanted 
> to plug something in.
>
> Or did I just do something really stupid?
>
> Best 73's!
>
> --Paul, wa0rse
>
> P.S. Windows XP likes you to "eject" Ozy before powering it off, just 
> like any other USB device! Duh!
> ==
>   


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