Bob Camp wrote: > Hi > > A metal shell inside a metal shell pretty well takes care of everything. > Gradients, transients, drafts, what ever. You don't need super thick > stuff. > Bud chassis, Hammond boxes, copper pipe, PC board material, or soldered > brass flashing all will do the trick.
We also tried mounting the modified 10811 in Hammond metal box. Initially, we mounted the 10811 to the box using the two standoffs that come with the 10811. However, this degraded the performance somewhat. We removed these and had the 10811 supported mechanically only by the edge connector. With that change, it was as good as the cardboard box. Remember that my modified 10811 is orders of magnitude more sensitive that an ordinary oscillator, so if I don't see a change, you definitely won't. During E1938A development, we compared foam to still air. We could see no difference. It's just an implementation choice. Rick Karlquist N6RK _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.