[Linrad] Re: SDR-IQ Birdies - the Solution

[VK2KU <clearmail.com.au; vk2ku@xxxxxxxxxxxxxxxx>]

Well, well, well - we learn new things every day!
The lid of the SDR-IQ is NOT electrically connected to the body of the
box.
Fortunately the circuit board and various cable connections ARE
grounded to the body of the box.

The lid is held in place with 8 small countersunk screws - M2.5?
The lid has been carefully painted, including the bevelled edges of
the screw holes,
thus preventing the screws from making electrical contact with the
lid.
The lid itself and the box are of course separated by 2 layers of
paint.
Just to make quite sure that no electrical connection occurs,
the screws themselves are also black anodized - another insulating
coating.

I removed the paint from the countersunk holes with a hand-held 90-
degree counterbore bit.
Then, lacking any other suitable screws or a more suitable tool,
I spent a happy and fiddly half-hour using a small flat file to remove
the anodizing from
the underside of the 8 screw-heads. I also lightly touched up the
threads to show some metal.

The result was the almost complete elimination of the offending
birdies - 99% anyway.
A bit of aluminium foil as suggested by Leif completely eliminated the
last traces.

Every SDR-IQ owner needs to do this!

73  Guy  VK2KU
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