[hpsdr] [HPSDR] Mercury IMD and BDR Measurements

[Lyle Johnson]

Ronald Cox wrote:
> 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?

I am sufficiently unfamiliar with PowerSDR and what all of their AGC 
parameters are intended to do to not be of much help.

Perhaps others on the list can chime in...

Lyle

>
> 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
>>
>
>
>



 1251762246.0