On Tue, 12 Nov 2013, gareth wrote:

Anybody who has prized the lid off from their mobile phone recently
cannot have failed to notice the tinplate-like screens shielding the RF
stages, in a similar manner to the lids on TV tuners.

As a ferrous screen is better than just aluminium for magnetic shielding,
I wonder if any have pressed into service the tinplate from cans of
baked beans to provide a similar function?

If so, what was the success in fabricating the springy fingers to ensure
a good seal?


What you do is find small cans, eat or discard the contents, wash
carefully, and then use those for the separate modules. No need to build
something up, the structure is sound as it is. Use a piece of circuit
board for the cover.

Then when it's all done, you hide it behind a wooden cabinet, safe in the
knowledge that nobody will look inside the fancy wooden box to see the
"ugly" tin cans, and safe in the knowledge that the tin cans will provide
the needed shielding so you can have the fancy wooden cabinet to hide it
all.

There was an early transistorized SSB transceiver in QST, and the author
actually build some of the stages in emptied out IF transformers (the tube
kind, that were so big).

MIchael VE2BVW