SEA Inc of Delaware SEA245 User Manual
ta8man.doc
Page 4-1
FCCID: BZ6SEA245
4 INSTALLATION
4.1 MOUNTING THE TRANSCEIVER
The SEA 245 transceiver unit is compact enough to allow great flexibility in
location, even on smaller vessels. Several options for mounting are available. The
mounting bracket fits either over or under the transceiver for overhead or shelf
locations. Figure 4.1 shows the outline dimensions of the SEA 245 transceiver and
mounting bracket. The bracket can be used as a template to locate the mounting
holes. When choosing a location for the transceiver, take care to avoid areas
directly over a heater or lacking adequate ventilation.
Take special care not to block airflow over the cabinet, since this can cause
overheating and resultant damage to the transceiver.
location, even on smaller vessels. Several options for mounting are available. The
mounting bracket fits either over or under the transceiver for overhead or shelf
locations. Figure 4.1 shows the outline dimensions of the SEA 245 transceiver and
mounting bracket. The bracket can be used as a template to locate the mounting
holes. When choosing a location for the transceiver, take care to avoid areas
directly over a heater or lacking adequate ventilation.
Take special care not to block airflow over the cabinet, since this can cause
overheating and resultant damage to the transceiver.
4.2 A TYPICAL INSTALLATION
Figure 4.2 shows a typical installation consisting of five parts: 1. The SEA 245
Transceiver/DSC unit; 2. The SEA 1635 antenna coupler; 3. The SEA 2450
Remote Controller unit; 4. The system interconnection cables; 5. The antenna
system.
Any radio communications system operating in the MF/HF spectrum MUST have
an adequate ground connection, otherwise the overall efficiency of the radio
installation is degraded. In extreme cases, it may be impossible to properly load the
radiotelephone into the antenna.
The 50 ohm output impedance of the SEA 245 makes necessary to employ an
antenna system of the resonant or externally matched type. The use of the SEA
1635 antenna coupler in conjunction with a whip antenna allows an efficient
installation which will cover both the MF and HF bands. The SEA 1635 was
designed specifically for Marine applications, is easily interconnected with the
transceiver and compatible with most shipboard antenna installations. Note that the
SEA 245 is also compatible with the SEA 1612C and SEA 1631 antenna couplers.
These couplers are capable of superior performance with shorter antenna systems or
higher duty cycle applications.
On wooden or fiberglass boats, the use of a copper ground plane may be necessary.
On sailboats, the keel may perform adequately as a ground system. In any case, the
ground system MUST be joined to the antenna coupler with a heavy copper strap.
Transceiver/DSC unit; 2. The SEA 1635 antenna coupler; 3. The SEA 2450
Remote Controller unit; 4. The system interconnection cables; 5. The antenna
system.
Any radio communications system operating in the MF/HF spectrum MUST have
an adequate ground connection, otherwise the overall efficiency of the radio
installation is degraded. In extreme cases, it may be impossible to properly load the
radiotelephone into the antenna.
The 50 ohm output impedance of the SEA 245 makes necessary to employ an
antenna system of the resonant or externally matched type. The use of the SEA
1635 antenna coupler in conjunction with a whip antenna allows an efficient
installation which will cover both the MF and HF bands. The SEA 1635 was
designed specifically for Marine applications, is easily interconnected with the
transceiver and compatible with most shipboard antenna installations. Note that the
SEA 245 is also compatible with the SEA 1612C and SEA 1631 antenna couplers.
These couplers are capable of superior performance with shorter antenna systems or
higher duty cycle applications.
On wooden or fiberglass boats, the use of a copper ground plane may be necessary.
On sailboats, the keel may perform adequately as a ground system. In any case, the
ground system MUST be joined to the antenna coupler with a heavy copper strap.
4.3 THE TRANSCEIVER UNIT REAR PANEL CONNECTION AND FUSES
4.3.1 THE POWER CONNECTOR
A heavy duty power plug is used on the SEA 245 to assure minimum voltage drop
in the primary power circuit. See Figure 4.3 for proper assembly of the power plug.
in the primary power circuit. See Figure 4.3 for proper assembly of the power plug.