I think that following basic rules is enough: fully shielded enclosure, cable/connector
shields terminated over 360 degrees to the case (NOT the PCB!!, google Pin 1 Problem),
common mode chokes on all connections, ground plane on the component side of the PCB.
Using a linear regulator for the CPU's voltage(s) would help too, otherwise you have to
deal with CPU harmonics, USB harmonics, and regulator's that will likely mix with everything
else.
That should cover a lot of issues already methinks.
Cheers, Kuba
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On Aug 27, 2011, at 12:52 AM, Jim Cotton wrote:
The real fun is keeping all the digital stuff that you add OUT of the existing analog
system...
Jim Cotton
n8qoh
________________________________
From: Amos Ku <amosku@...>
To: "hp_agilent_equipment@..." <hp_agilent_equipment@...>
Sent: Friday, August 26, 2011 2:41 PM
Subject: Re: [hp_agilent_equipment] Which HP spectrum analzyer is structurally most similar to that of HP 8565A?
Tim,
This email is to respond to your earlier email about having some VGA kit to replace the CRT.
I have an idea. Since all the display section does is to take the signal to be display (y-axis) and sweep the screen with sweep signal (x-axis), I can make up a digitized circuit that does the same thing as what CRT will do and connect the output to a LCD module that fits right into the window of HP 8565A, I can have a cheap solution for replacement of CRT tube circuit.
My idea came from here:
.
About the normalizer part. I am thinking about build up something based on the same design of normalizer in SMD and place the circuits inside the large cavity where CRT is in. I can then have all the functions I need in the same box. I am thinking about changing the weird AUX connectors to some easy to get connectors from Digikey (same pin numbers, same dimensions.)
Amos
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