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Sayma AMC/RTM issue tracker
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RF shielding of Sayma_RTM #126

Closed jbqubit closed 7 years ago

jbqubit commented 7 years ago

@gkasprow Please reiterate options we discussed in today's call.

gkasprow commented 7 years ago

Added 3 Wurth 30x30mm boxes with removable lid. All clocking circuits are covered obraz

hartytp commented 7 years ago

@gkasprow Looks good, so long as it won't cause a problem with thermal performance.

jbqubit commented 7 years ago

On Friday we also discussed metal shield fully covering the back side of each Sayma_RTM. This would provide board to board isolation. The value of this could be tested in 0.1 by comparing the performance of a rack with adjacent Sayma_RTM vs a rack with metal spacers interleaved between the Sayma_RTM. Is NAMC-Filler FS-RP1D made of metal? Can it serve as a good RF shield for tests?

gkasprow commented 7 years ago

Piece of steel that has no connection to ground is poor shield. So even if you manage to insert NAMC-Filler FS-RP1D (without panel) between AMCs, it won't help much in RF shielding. I saw somewhere (I have to ask Pentair) complete RF shields for RTMs. And IMHO only such solutions would help.

gkasprow commented 7 years ago

I found covers from Schroff: http://schroff.pentair.com/en/schroff/MicroTCA-/Module-cover-for-MTCA-4-front-and-RTM-modules These are just mechanical protection cases, not RF cages.

gkasprow commented 7 years ago

I got mechanical files from Schroff. Such case will fit, but it requires some changes to the layout Look here: Sayma_RTM_shield.pdf In this 3D view, both solution with cage and individual shields are shown so they intersect in some places Similar cage exists for AMC side.

jbqubit commented 7 years ago

3 Wurth 30x30mm boxes with removable lid.

The Wurth boxes sound fine. Closing Issue. Re-open if they pose thermal problems.