[hpsdr] Excalibur Finished - Some Questions

[Joe Martin K5SO]

…also, you needn't terminate the unused I/O connectors on Alex, they're open internally anyway until the relevant relays are switched in.  

Joe K5SO

On Mar 26, 2012, at 2:46 PM, Joe Martin K5SO wrote:

> ***** High Performance Software Defined Radio Discussion List *****
> 
> John, 
> 
> I do not have such spurs on my system using Excalibur (and an external Rb vapor source as the standard).  Before putting the suggested grounds on the three Alex units I had several spurs showing up, especially on the 10m band.  Looks great now.  
> 
> 73,  Joe K5SO
> 
> On Mar 26, 2012, at 2:38 PM, John Westmoreland wrote:
> 
>> ***** High Performance Software Defined Radio Discussion List *****
>> 
>> HPSDR,
>> 
>> OK - have finished building Excalibur and am getting the green LED - and it is up and running on my rig.
>> 
>> I will calibrate it once I borrow Don's (ARRL Ham of the Year) rubidium standard.  But should be +/- 1 Hz as is.
>> 
>> I do have a question - I have noticed 10MHz spurs and harmonics picked up a bit or seemingly have.
>> 
>> I haven't implemented the extra grounds on Alex yet - does anyone know if I implement those grounds if it'll kill the spurs?
>> 
>> Another question - should the unused I/O on Alex have 50-ohm terminators installed?
>> 
>> 73's,
>> John
>> AJ6BC
> 
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