[evlatests] Three bit samplers

[Jim Jackson]

The wiring scheme shown on the block diagram is the one Brent came up 
with a couple years ago.  My impression was it was needed because of 
the architecture and wiring of the correlator. If this one also works 
with the current correlator wiring, it's fine with me.

Cheers,
Jim

At 05:31 PM 11/13/2008, Barry Clark wrote:
>I admit it has taken me a few too many years to realize it, but we
>have the three bit samplers wired wrong.
>
>T304s have outputs labeled 0 for 8bit sampler, 1,2 for three bit samplers.
>
>Connection from D30x to T304-x is (cf block diagrm on wall downstairs)
>
>D301 to T304-a(0) and (T304-a(1) and T304-c(1))
>D302 to T304-c(0) and (T304-b(1) and T304-d(1))
>D303 to T304-b(0) and (T304-a(2) and T304-c(2))
>D304 to T304-d(0) and (T304-b(2) and T304-d(2))
>
>Better connection is
>
>D301 to T304-a(0) and (T304-a(1) and T304-c(1))
>D302 to T304-c(0) and (T304-a(2) and T304-c(2))
>D303 to T304-b(0) and (T304-b(1) and T304-d(1))
>D304 to T304-d(0) and (T304-b(2) and T304-d(2))
>
>This would permit operating IFs AC in eight bit mode and IFs BD
>in three bit mode (or vice versa), which does not work with the
>current wiring.
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