[hpsdr] [HPSDR] Mercury IMD and BDR Measurements

[Ronald Cox]

Lyle,
I will run all the measurements again tomorrow, as I ran this set  
prior to shielding the antenna switch and eliminating the ground loop   
on the power input to the antenna switch. I now have two rigs to test,  
One with a dual core atom, and the other with a Core2 Duo (E8400). I  
have one question , and this may explain the some of the measurement  
issues. Where should the AGC and AGC-T be set during the measurements?  
I read in the ARRL handbook that the AGC should be off, would that be  
fixed and Max AGC-T?

Ron W9KFB
Indianapolis

On Aug 31, 2009, at 5:29 PM, Lyle Johnson wrote:

> " See the HPSDR Wiki page: http://openhpsdr.org/wiki/index.php?title=A_complete_HPSDR_transceiver 
>  "
>
> Thank you for contributing this page, Ron.
>
> I was reviewing the specs at the bottom and two things jumped out at  
> me:
>
> 1) The 20 meter BDR seems weak, especially since it is so much  
> better at 80m and 10m.  Is that a typo, or ?
> 2) The IMD DR seems very poor. I'd've expected at least 20 dB better  
> and more like 30 dB better.
>
> Anyone else make any of these measurements on Mercury?
>
> Thanks!
>
> Lyle KK7P
>


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