[hpsdr] Anan-10 spurs

[Erik van Maanen]

Highest spurs are -120dBm here but most of them are below -125dBm.
I have the TAPR board in the anan-10 case+amp from apache.
One thing I discovered is that the routing of the thin coaxes to the amp 
in the box makes a big difference so its worth to open anan and see if 
they are close to the
switch mode power supply.

For measurements I have a separate angelia board, there are almost no 
spurs and all of them below -130dBm.
I am 99% sure they come from the external power supply, angelia doesn't 
have the switch mode power supply.
Besides that everything is relative, -130dBm is a level most commercial 
ham sets and even the older professional sets are not able to detect.
Since I have hermes the professional stuff ( Rohde & Schwarz etc  ) was 
collecting dust and I eventually sold everything to fund an angelia board.
Never regretted, hpsdr users are seriously spoiled :-).

73, Erik PA3DES