+2011.04.13
+- Pondering how much to clip off the SMA end of the PCB to ensure the SMA
+ flange fits inside the box.
+
+ Our connector needs 3.81 mm "above" the PCB which for TeleBT actually
+ means between the PCB bottom surface and the base of the box. The box
+ boss height is specified as 4mm, so that fits in a purely vertical sense,
+ but I'm worried about the box wall to base radius, and the fact that the
+ box walls aren't exactly vertical.
+
+ Hammond doesn't specify the radius between the wall and base of the 1551K
+ box. Given other things they do specify, it might be that 1 mm is a
+ conservative guess. The specification for the inside dimensions of the lip
+ around the lid is 10 mils smaller than the max PCB dimensions, and it *looks*
+ like that inside edge might be about where the wall radius ends. The drawing
+ shows the lid inside as 6.73mm less than box outside dimension, which seems
+ reasonably consistent with my estimate of a 2mm wall thickness, about 1mm
+ for the lid lip, and some mold tolerances. So, let's use the box lid lip
+ inside dimensions as a proxy for the box base inside dimensions until proven
+ otherwise.
+
+ So we need to peel 5 mils off to account for the box radius. The flange
+ itself is 40 mils. And I'm nervous about the guesstimates so I'll add
+ another 5 mils of margin. So we need to take 50 mils off the SMA end of
+ the PCB.
+
+ As a sanity check, on TeleDongle the closes screw hole is 78 mils from the
+ SMA edge of the PCB, which is 50 mils less than a maximum-size PCB would
+ have. If anything, the TeleDongle SMA ends up inside the wall a bit more
+ that necessary, such that tightening the SMA nut deflects the wall inward.
+ So, 50 mils might indeed be a good choice for TeleBT. We'll give it a try!
+