Joe,<div><br></div><div>Thanks for the reply.</div><div><br></div><div>Did you ground internal to the Alex chassis or did you run external to the HPSDR frame? How long are each of your ground runs?</div><div><br></div><div>
73's,</div><div>John</div><div>AJ6BC</div><div><br><div class="gmail_quote">On Mon, Mar 26, 2012 at 1:48 PM, Joe Martin K5SO <span dir="ltr"><<a href="mailto:k5so@valornet.com">k5so@valornet.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="im">***** High Performance Software Defined Radio Discussion List *****<br>
<br>
</div>…also, you needn't terminate the unused I/O connectors on Alex, they're open internally anyway until the relevant relays are switched in.<br>
<span class="HOEnZb"><font color="#888888"><br>
Joe K5SO<br>
</font></span><div class="HOEnZb"><div class="h5"><br>
On Mar 26, 2012, at 2:46 PM, Joe Martin K5SO wrote:<br>
<br>
> ***** High Performance Software Defined Radio Discussion List *****<br>
><br>
> John,<br>
><br>
> 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.<br>
><br>
> 73, Joe K5SO<br>
><br>
> On Mar 26, 2012, at 2:38 PM, John Westmoreland wrote:<br>
><br>
>> ***** High Performance Software Defined Radio Discussion List *****<br>
>><br>
>> HPSDR,<br>
>><br>
>> OK - have finished building Excalibur and am getting the green LED - and it is up and running on my rig.<br>
>><br>
>> I will calibrate it once I borrow Don's (ARRL Ham of the Year) rubidium standard. But should be +/- 1 Hz as is.<br>
>><br>
>> I do have a question - I have noticed 10MHz spurs and harmonics picked up a bit or seemingly have.<br>
>><br>
>> I haven't implemented the extra grounds on Alex yet - does anyone know if I implement those grounds if it'll kill the spurs?<br>
>><br>
>> Another question - should the unused I/O on Alex have 50-ohm terminators installed?<br>
>><br>
>> 73's,<br>
>> John<br>
>> AJ6BC<br>
><br>
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