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SGC HF SSB - Feedlines

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61
The SGC Building, 13737 S.E. 26th St. Bellevue, Washington 98005 USA
P.O. Box 3526, 98009 Tel: (425) 746-6310 Fax: (425) 746-6384
© 1997 SGC Inc.
installing HF antennas. Of course, whip antennas can be installed on the higher parts of the boat, and because the
vertical height of the boat is of little importance, you can install much larger vertical antennas than would be
possible on a vehicle. Also, the natural contours of most boats make random longwire antennas a possible choice.
Feedlines (sometimes also known as transmission lines) are the cables that carry radio signals from the
transmitter to the antenna or from the antenna to the receiver. Feedlines are very important for transmitting because
a "lossy" feedline could allow most of your signal to "drain" away or cause technical problems that could reduce the
transmitter output portion of your transceiver.
Not only must these feedlines carry your signals back and forth between the antenna
and the transceiver, but they must create a match between the antenna and the transceiver.
What must be matched is the impedance of any given system. The impedance is the
SG-230
COUPLER
MOUNTED
INSIDE COACH
RECREATIONAL VEHICLE
ANTENNA INSTALLATION
18" PVC PIPE
STAND OFFS
METAL ROOF
OF VEHICLE
ANTENNA WIRE
USE A SEPARATE GROUND STRAP OR WIRE FOR THE BODY AND
THE CHASSIS TO THE GROUND OF THE COUPLER
FEEDLINES
Impedance must be
"matched" in an
HF system for
proper operation.

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