[hpsdr] Excalibur Finished - Some Questions

[John Westmoreland]

Joe,

Thanks for the reply.

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?

73's,
John
AJ6BC

On Mon, Mar 26, 2012 at 1:48 PM, Joe Martin K5SO <k5so at valornet.com> wrote:

> ***** High Performance Software Defined Radio Discussion List *****
>
> …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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