This is fine and dandy, but for real instruments you need
VectorVGA Pro, and it looks like it's neither designed to
be affordable, nor was their NRE "cheap".
Once you decide to use an FPGA (like they must surely do),
it's cheap to select one that got enough power
to do more useful things than merely drawing stuff.
That's why I need input from people who have instruments
that they'd like to interface with.
Cheers, Kuba
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On Sep 1, 2011, at 4:03 PM, Christophe Huygens wrote:
Hi Bill,
I think this one of them. But I think there are others too:
Was this what you were looking for?
Xtof
On 01/09/11 21:32, Bill Ress wrote:
Hi Chris,
I must have missed the reference. I have cobbled up something for my
141T series but really need something much better. Could you send me the
reference link?
Thanks...Bill
On 9/1/2011 7:34 AM, Christophe Huygens wrote:
These are available, I think this was discussed before.
Xtof
On 01/09/11 16:08, Kuba Ober wrote:
I'm thinking of biting the bullet and making an affordable X-Y-(Z) to
VGA/USB converter for use with various instruments where existing X-Y
displays are dying.
I'm looking for input about the required specs and functionality:
1. Bandwidth
2. Input voltage ranges
3. Required accuracy on voltage-to-coordinate transformation
4. Requirements for sequence triggers to change colors: for example,
if a display
draws some nomenclature, and then goes on to draw traces, it'd be good
to have a way
of setting it up to switch colors automatically on certain events (X,Y
in a certain
area, retrace on X, etc).
5. Other inputs needed for interfacing with particular instruments
6. Resolution: I'm thinking it'd be a 1024x768 24bit framebuffer
7. Persistence adjustments: how many rectangular areas should there be
(upper limit),
each with its own persistence value.
I'm also wondering if there are any spectrum analyzers where display
accuracy would benefit
from taking some IF frequency/ies as the X coordinate instead of a
voltage. Counting frequency
is easy. For my 7L14 I was thinking of using both IFs as the inputs;
that would improve
the accuracy of the display and would make it fixed-frequency.
I don't have any HP SAs or other instruments like that, all I have is
a 7L14 spec an.
I'd try to make it as low cost as possible of course, but specs come
first.
Cheers, Kuba Ober
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