>I just bought a DX-394. This unit has a grounding terminal on the back. I
>have grounded it to a cold water pipe.
>Now, when I run my outside antenna to the radio and connnect it to the RCA
>type jack, should I ground the antenna as well?
>I currently have the antenna hooked up to a 1/8 inch miniplug, and I have
>this grounded. If I can find one at radio schack, I may just buy an adapter
>so I don't have to cut the miniplug off. I would like to be able to easily
>switch the antenna between the 394 and my Sangean 909.
This discussion is from the point of view of reception only. The legal
requirements for protecting your antenna from lightning strikes can be
determined by calling your local building inspector's office.
Grounding the RADIO is an excellent idea. Ground is a part of every
antenna system. Your antenna's signal will find a path to return
to ground, one way or another. For instance, the ground path of a
typical inexpensive AM portable radio, operating on the fourth floor of
a house might be via capacitive coupling to whatever nearby wiring (the
AC-line's ground wire for example) is connected to ground. Perhaps
you've noticed that sometimes, you can increase the effect of the
capacitive path to ground enough, just by holding the radio in your
hand, to increase the readability of a weak station. By providing a
more efficinet wired ground path for your SW receiver, often you can
increase signal readability more reliably (and more comfortably <g>)
than you might by holding onto your receiver.
It is true that grounding the antenna itself is a good precautionary
measure WHEN YOU AREN'T USING THE ANTENNA. Grounding the antenna will
give your house and your equipment some measure of protection against
static electrical build up and nearby (but not too nearby <g>) lightning
strikes. However, grounding the antenna while your using it will
drain away some/most/all of the received signal (depending on where on
the antenna the ground connection is made) to ground rather than to your
Ground the receiver.
Ground the antenna when you're not using it, or if the antenna was
specifically DESIGNED to be grounded.
Daniel Grunberg Kensington MD USA