[R-390] Thermal Stability and Top and Bottom Covers?

[Charles Steinmetz]

Bob wrote:

> The covers *do* add electromagnetic shielding to the radios. In an environment with co-located transmitters
> and antennas a few feet away, they are a pretty good idea.

I've never compared a 390 or 390A with and without covers side-by-side 
for shielding (in)effectiveness, but they are so bad with covers it's 
hard to imagine them being much worse.

Best regards,

Charles