[hpsdr] Ground: Some questions of a newbie

[Graham / KE9H]

Alexander:

I would recommend that Atlas is mounted inside a case, or on a metal plate
with six metal studs.  There are four holes in the corners, sized for #4 
screws.

I found the circuit board would bend when inserting and removing cards just
supported at the four corners, so I also added two more #4 studs using
the mounting holes for connector J4.  That way, Atlas is supported
in the middle also.

The support studs can be any length from 1 to 2 centimeters.  The corner
studs will pick up the ground from the Atlas PC board.

The system does not need the ground to operate, or for experimenting,
but would be a good idea for permanent installation.

Spacing the Atlas board off the table is a good idea for experimenting,
also. We had a member leave the Atlas flat on his workbench, and some
metal hardware got underneath the board, shorted out the power, and
damage several cards, so using the spacers-studs for day to day 
experimenting
is a good idea also.

--- Graham / KE9H

==
Alexander Geckeler wrote:
> ***** High Performance Software Defined Radio Discussion List *****
>
> Dear all!
>
> I'm a happy owner of a HPSDR Reveiver (Atlas, Ozy and Mercury) which I 
> successfully brought to life two days ago with the support of Horst 
> (DL6KBF) who provided me the right version of PowerSDR.
>
> Because I feel a bit uncomfortable to have the Atlas board and the 
> modules on it without any housing on my desk, I will build a case for 
> it. Regarding this small project I came up with some questions re. 
> ground, which I can't answer by myself because I missed the knowledge 
> (To be honest, I'm a newbie).
> Maybe someone of you guys can help me and give me some answers.
> The questions are:
> 1. Is it necessary to mount ground to the Atlas board. If so, how?
> 2. Should Atlas be connected to the case (planned is a metall 
> hounsing) and the case to ground?
> 3. What kind of board spacer is appropriate - metall or plastic - to 
> mount Atlas into the case?
>
> Many thanks in advance for your answers and help.
>
> 73, Alexander
>



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