[aprssig] CFL Bulbs and Shack backup power ;-)

[david vanhorn]

WOOT!  Off topic a bit, but if there's anyone who will understand, it's you
guys.

Our new system is essentially unobservable on radiated emissions from 100kHz
to 7 GHz, except when transmitting, and even then the only thing we see is
carrier and 3rd harmonic which is lower than -45dBc.

Conducted is measurable, but more than 30dB below limits at the worst
points.

EFT test ( very nasty high speed relay chatter noise) > 4500V, the test
system started crashing before we failed.

This is an ARM processor at 48 MHz, and a 2.4 GHz radio on a two layer
board. No shielding or special filtering, beyond good layout and appropriate
bypass caps.


Radiated immunity maxed out the ability to generate signals, >50V/m from 1
MHz thru 1GHz, and >192V/m in some spots (limited by capability to generate
power)
Radiated immunity was done with simply the PCB in a plastic holder, without
the usual metal enclosure.
Sanity check, fluorescent tube in the GTEM lights nicely during the radiated
test.

I'm guessing that you could have a houseful of these things, and never know
it on your radios, and never worry about them going nuts when you key up.

(happy dance....)
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