58. SIGNAL BUOY RELEASE JETTISON SWITCH 



59. MAIN POWER LOSS INDICATOR 



60. TRIM MERCURY FORWARD 



61. TRIM MERCURY AFT 



62. JETTISON SWITCH PORT BATTERY 



63. JETTISON SWITCH PORT BATTERY 



64. JETTISON SWITCH STARBOARD BATTERY 



65. JETTISON SWITCH STARBOARD BATTERY 



66. EMERGENCY WEIGHT DROP 



67. POWER TO EMERGENCY SWITCHES 



CIRCUT BREAKERS 



68. EMERGENCY RELEASE PANEL 



69. BALLAST CONTROL PANEL 



70. UNDERWATER TELEPHONE 



71. LIGHTS (INTERNAL) 



72. COMMUNICATIONSPANEL AND RADIO 



73. EXTERNAL POWER CONTROL PANEL 



74. LIFE SUPPORT 



category (Table 10.5), which provide commu- 

 nications up to 50 miles although not more 

 than 10 or 15 miles are obtained. The exten- 

 sive use of these frequencies, both at sea and 

 ashore, has led to a wide variety and quality 

 of available equipments. 



Some of the larger vehicles use much 

 longer-range surface communications sys- 

 tems. ALUMINAUT, for example, carried a 

 75-watt radio transceiver with six channels 

 and broadcast on 2 to 6.5 MHz. This system 



included the Coast Guard emergency fre- 

 quency of 2182 kHz and frequencies compati- 

 ble with the nearest commercial marine op- 

 erator. 



Support ship radio requirements in addi- 

 tion to those connected with submersible 

 communications can be extensive. In most 

 open-sea operations (military or civilian) 

 someone, somewhere must be kept abreast of 

 the mission's progress. Additionally, break- 

 downs, delays and the need for spare parts or 



TABLE 10.5 STANDARD RADIO BAND TERMINOLOGY 



Frequency Range 



From 



To 



Band Name 



Abbreviation 



30 kHz 



300 kHz 



3 MHz 



30 MHz 



300 MHz 



below 30 kHz 



300 kHz 



3 MHz 



30 MHz 



300 MHz 



3 GHz 



Very-low-frequency 



Low-frequency 



Medium frequency 



High-frequency 



Very-high-frequency 



Ultra-high-frequency 



VLF 



LF 



MF 



HF 



VHF 



UHF 



491 



