Page Comparison

...

• I am rushing this because machine shop closes for three day weekend!!

• Getting connectors for this via 2024-05-15 Digikey Order

  • ensured they have the dielectric on the output to keep the 50 ohms

  • went with ones with just two bolts hoping easier to secure

• Box Tubing

  • https://lea.hamradio.si/~s53mv/cavity/cavity.html

    • uses 60x40mm tubing so 2.4 x 1.5 inch exterior for similar center frequency designs

  • https://ems-stores.uwaterloo.ca/ems-site/aluminum-sq-rect-tubes

    • they really dont have anything that close

    • Alum Rect Tube 2 X 1 X .125 Wall so 2 x 1 inch

      • seems like the closest, inner diameter will be 1.8 which is actually quite far off

      • hopefully I can make this solve working off of the table provided

    • Alum Rect Tube 3 x 1 x .125 Wall so 3 x 1 inch

      • going from the inner diameter this will be closest on the 3 inch axis but the 1inch on the other one is gonna be tough to work with, will see if it solves, kinda gotta send it

    • Wall thickness

      • the .125 wall thickness is a bit thicker than the 0.01 inch used so

  • https://ems-stores.uwaterloo.ca/ems-site/steel-tubing

    • they have this in better sizes than aluminum

    • steel has less conductivity (~ 5x less) so it’s really not viable

  • https://www.homedepot.com/b/Hardware-Metal-Stock-Metal-Tubes/Aluminum/Square/N-5yc1vZ2fkos9vZ1z1czmvZ1z1czw8

    • not even close

  • Length

    • 7 inch, I can pick this so yea will just tell them

• Finger pieces

  • https://ems-stores.uwaterloo.ca/ems-site/aluminum-solid-rounds

  • diameter

    • must go with 0.25 or 0.5 inch

    • i have no idea what’s gonna be better but 1/4 inch seems like the way to go here because it’s closer

  • length

    • 1.9inch if they can do it, otherwise 2inch should be tunable with the screws and sanding down

• End Cover

  • 0.6mm sheet aluminum was used (could be thinner tho if they have?)

  • as thin as possible at EMS

  • Dimension options to cover 1x3inch tube with an extra 1/2 inch (reference used 0.4inch on each end so 0.8inch total) on bent part gives

    • 1.5x3

      • this one seems preferable

    • 1x3.5

  • https://ems-stores.uwaterloo.ca/ems-site/aluminum-sheets

    • Alum Sheet - 5052 H32 20 GA. - .032

• Fasteners

  • 4x for SMA conn bolts M3X3

  • 3x tuning bolts M3X15

  • 3x tuning counternut and lockwasher

  • 3x finger bolts

  • 8x end cover bolts M3 (M3X6 ?)

  • 8x end cover nylock nuts M3

• copper/brass rod for probe

  • EMS doesn't have anything good for this, will need to get inventive here, not sure where to get brass rods or thin copper tube. guide uses UT-085 semirigid shield but I don’t have any of that

  • We have steel rods that are for little red yard flags

    • I can solder to these easily

    • Can easily cut myself with wire cutters

    • width should be close enough hopefully

EMS Purchase

Website and sign says they close 4:30pm friday, but 3:45pm they were closed. This means not gonna happen for competition.

• Alum Rect Tube 3 x 1 x .125 Wall

  • 7 inches

  • 1x

• Alum Solid Rounds 1/4 - 6061

  • 3x

  • 1.9 inch (2inch ok)

• Alum Sheet - 5052 H32 20 GA. - .032

  • 1.5x3 inch

  • 2x

• Metric Steel Socket Head Cap Screw 3X10MM X 0.5

  • 20x

• Metric Steel Socket Head Cap Screw 3X20MM X 0.5

  • 10x

• Metric Steel Socket Head Cap Screw 3X16MM X 0.5

  • 10x

• MET NUTS M3 X 0.5

  • 20x

• MET LOCK/SPRING/WASHERS M3

  • 20x

...