User manual

Mailing: PO Box 3526, Bellevue, WA. 98009
Shipping: 13737 SE 26
th
St. Bellevue, WA. 98005
Toll Free: 800-259-7331 * Phone: [phone] * Fax: [phone]
www.sgcworld.com * Email: [e-mail]
27
More than any other
factor, a good RF
ground will help to
improve the radiated
signal from these
antennas and
minimize RFI
generated by the
antenna.
As a minimum, an RF
Ground can consist of
a wire 5-10% longer than the wire antenna and laid out so that it
does not cross over itself or form a loop. A far better RF ground
can be constructed by adding ground radials radiating from a
suitable point and connected to the RF GND lug on connector 2 of
the MAC-200.
3.3.5.5 Vertical Antennas
A vertical antenna may be
connected to the MAC-200
in a number of ways. Most
vertical antennas will require
an RF Ground system to
function properly, but this
Mailing: PO Box 3526, Bellevue, WA. 98009
Shipping: 13737 SE 26
th
St. Bellevue, WA. 98005
Toll Free: 800-259-7331 * Phone: [phone] * Fax: [phone]
www.sgcworld.com * Email: [e-mail]
28
may be incorporated into the design of the antenna itself.
A typical vertical antenna is the GROUND PLANE design that
incorporates radials within the design. This, and may other vertical
antennas use an SO-239 connector or equivalent to feed the
antenna. This type of antenna should be connected to one of the
three SO-239 connectors on the MAC-200 (switches 1, 2, or 3).
Any vertical antenna fed with Coaxial cable can be connected in
this way.
Home made vertical
antennas are commonly
made in one of two
ways. A very common
type of construction
builds the radial system
at the base of the
antenna. Flag pole
antennas are normally
built in this way. Coax
line can be run from the
MAC-200 to the base of the antenna. The center lead of the coax
will feed the radiating element in the flagpole vertical while the
coax shield will be connected to the RF grounding system.
Another way that a vertical can be fed is to have it fed with a wire
directly from the MAC-200 with the RF grounding system also
connected directly to the MAC-200. In this case, the vertical will