It's all part of the same big picture.
The Pin 1 problem discussed by Muncy and Brown refers to the incorrect use of audio shielding when the cable shielding bypasses the equipment chassis and relies only upon circuit ground.
I'm discussing RF shield connectivity -- not audio. Moreover, I am not advocating the abandonment of the chassis for the SO-239. Rather, the chassis should not be the basis of the only RF ground return from the SO-239. Mil-Spec equipment not only makes use of the chassis ground but also brings the RF coax shield all the way to the chassis connector. The better equipment manufacturers (e.g., Mil-Spec) do not rely on a path of sheet metal, screws, and other hardware to ensure a low impedance RF path -- only to have that pathway deteriorate with time in less than ideal operating environments.
The inclusion of the coaxial braid onto the SO-239 has no relevancy in and of itself to the Pin 1 audio problem.
Paul, W9AC _______________________________________________ Drakelist mailing list [email protected] http://mailman.zerobeat.net/mailman/listinfo/drakelist
