User manual KENWOOD TS-120S SERVICE MANUAL

[. . . ] Consult your car manufacturer and amateur radio equipment dealer for the requirements and installation. This equipment generates or uses radio frequency energy. Changes or modifications to this equipment may cause harmful interference unless the modifications are expressly approved in the instruction manual. The user could lose the authority to operate this equipment if an unauthorized change or modification is made. INFORMATION TO THE DIGITAL DEVICE USER REQUIRED BY THE FCC This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. [. . . ] In this case, press [MODE] (1 s) to reverse the shift (the upper sideband is used). · "FSR" appears. · Traditionally, the lower sideband is used for FSK operation. "FSK" appears. 42 9 SPECIALIZED COMMUNICATIONS AMTOR/ PacTOR/ CLOVER/ G-TOR/ PSK31 Besides RTTY, digital modes which have been used among hams include AMTOR, PacTOR, CLOVER, GTOR, and PSK31. For details, consult reference books about the digital mode communications of amateur radio. AMTOR (AMateur Teleprinting Over Radio) has brought amateur HF digital communication into the computer age. It is the first error-free HF digital mode by which data bursts (not steady stream of data) are transmitted. PacTOR (Packet Teleprinting On Radio) has combined the best features of both AMTOR and Packet to improve the efficiency of HF digital communications. Like Packet and AMTOR, PacTOR sends error-free data using a handshaking method. Of all the Amateur Radio HF digital modes, CLOVER offers the best overall performance using a complicated modulation technique, automatic power adjustment and other advanced features. It may allow communications to be maintained under the worst conditions. G-TOR (Golay-coded Teleprinting Over Radio) is a relatively new Amateur Radio digital mode currently in use. For further information, consult reference books which should be available at any store that handles Amateur Radio equipment. On Internet search engines, use "Packet Radio" as key words to find those Web pages. Note: Unlike a TNC, a Multimode Communications Processor (MCP) serves as a communications interface in several digital modes such as Packet, RTTY, and AMTOR. You can cause it to switch among the modes by sending a single command from your computer. If there is an amateur radio club in your area, consider becoming a member. You can often learn more in an hour from experienced hobbyists, than in a month of independent research. Ask on the local repeaters or contact your national amateur radio organization (the ARRL in the U. S. A. ) for information on local amateur radio clubs. You'll be glad you did. 43 9 SPECIALIZED COMMUNICATIONS SLOW SCAN TV/ FACSIMILE Slow-scan Television (SSTV) is a popular application for transmitting still images over the air, from one station to another. Instead of trying to describe your station, simply showing it is much faster. Transmitting images over the air requires a scan converter, besides a transceiver. A scan converter transforms images taken with a video camera into audio signals that can be fed into your transceiver. The recipient's scan converter transforms audio signals back into video images so that he or she can view them on a TV set. [. . . ] These symptoms are not malfunctions. DC POWER SUPPLY As stated in the SPECIFICATIONS {page 91}, this transceiver requires a supplied DC voltage source of 13. 8 V ±15%. If you find that the transceiver cannot be switched ON, or that it shuts OFF automatically, the DC voltage may be outside the specified range. In such a case, remove the DC cable from the transceiver immediately and confirm that the supplied voltage is within the specified range. FAN NOISES When the TX/ RX unit is installed in a non-ventilated area, the cooling fan(s) may increase in speed and emit a high level of noise for a long time. This is because the TX/ RX unit cannot be cooled down with the regular fan speed. [. . . ]