Sailor SP3300 Operation Manual - General

7

General

Antenna

The antenna for the radio is fitted to the unit

via a robust screw fitting to an M6 threaded

socket on the top of the radio. This system is

more rugged than a traditional BNC

connector, so the radio’s drop-proof integrity

is not compromised by the antenna fixing.

While the radio is drop-proof and very

robust, damage to the antenna such as

bending or kinking may adversely affect the

transmission efficiency of the unit, which

may lead to overloading of the power

module. Damaged antenna should be

replaced immediately.

30 m/ 

100 ft 

Mast

9 m/ 

30 ft 

Mast

87 km / 65 M

13-16 km 

8-10 M

20 km / 12 M

8 km / 5 M

20-26 km / 12-16 M

46-53 km / 29-33 M

Cherbourg

Isle of Wight

Endeavour

Niton

Replacement antenna and other spare parts

can be purchased from your local reseller.

Please refer to section Spare Parts &

Accessories.

Transmission Range

Because VHF signals travel in a straight line

and are not reflected back off the iono-

sphere as lower frequency signals are, the

range of VHF signals is limited to ‘line of

sight’, beyond which the other vessel

passes behind the curve of the Earth.

Therefore, the range will increase greatly the

higher above sea level the antenna is, as

illustrated (assuming maximum transmission

power is used):

Therefore, the typical range of a hand-held

radio such as this one used at sea level will

be approximately 8 Km (5 Miles). This will

increase as height above sea level in-

creases, or if the other radio user’s antenna

is at a greater height - note that the range

between the yacht with the antenna

mounted on a 9 M (30 Ft) mast and the

hand-held user increases to 13-16 Km (8-10

Miles).

0438