SGC SMARTUNER SG-237 Technical Information download pdf (Page 21)

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Radiation

Base Delta Loop

Coupler

Radiation

75 feet

Porcelain

isolator

Lower mast connection

to coupler RF ground

Vessel

Groundless

Loop

Coupler

10.9 Delta Loop Antennas: These

are ideally suited to long range

communications due to their low

angle. This configuration is best for

communications ranging from 500

to 5000 miles in the HF frequency

range of 4 to 22 MHz. Noise rejec-

tion is excellent. Because the an-

tenna system is not connected to a

ground, noise rejection is en-

hanced.

10.8 Triangular Loop Antenna: This

antenna for sailboats is designed to oper-

ate in a groundless environment and still

provide high performance. This type of

installation will require only one insula-

tor point on the bottom back stay and an

electrical connection on top of the mast

and the stay. The grounded side of the

coupler should be connected to the bot-

tom of the mast.

Radiation

75 feet

Porcelain

isolator

Vessel

insulated

Backstay

Ground

connection

Porcelain

isolator

Coupler

10.7 Insulated Backstay:

The coupler must be placed

as close as possible to the

base of the backstay antenna.

Connect the RF ground ter-

minal to all of the metal parts

or structures of the boat.

SG-237 Manual

page 21

Thursday, July 26, 2001 16:13

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