Kenwood TS-990S Operation Manual - Page 78

4 BASIC OPERATIONS INTERNAL ANTENNA TUNER As explained in "ANTENNA INSTALLATION AND CONNECTION", you will have the best performance when matching the impedance of the coaxial cable with the antenna. {page 1-1} To adjust the impedance between the antenna and the transceiver, use an external antenna tuner or the internal antenna tuner. SECURING THE MATCHING TO THE ANTENNA 1 Select the transmit frequency. 2 Press [ANT] (F) to select the antenna. • Ensure that "ANT 2" has been selected if the internal antenna tuner will be used and if the external antenna has been connected to the ANT1 connector. • If the external antenna has been connected to the ANT1 connector, the internal antenna tuner cannot be used with "ANT1" selected. 3 Press and hold [AT/TUNE] to tune. • The transceiver is placed in CW mode, and tuning begins. The transmit power will be "10 W", the SWR meter will be selected as the transmit meter. • After the tuning has completed, the blinking ">T" lights. While the antenna tuner is enabled during the reception, the blinking "R>" also lights. • To stop tuning, press [AT/TUNE] again. • If the Standing Wave Ratio of the antenna is extremely high, such as 10:1 or higher, a Morse code "SWR" alert sounds and the internal antenna tuner turns off. • Adjust the antenna system to lower the Standing Wave Ratio before tuning again. 4 Ensure that the antenna tuning has completed. • Upon normal completion of the antenna tuning, a Morse code "T" sounds. • "RT" stops flashing on and off, and remains on upon completion of the antenna tuning. The "AT" LED lights. • If the antenna tuning does not complete in 20 seconds, a Morse code "5" alert sounds. In this case, pressing [AT/ TUNE] stops the tuning function and returns to receive mode. Note: ◆◆The internal antenna tuner does not tune outside the licensed transmit frequency range. ◆◆Press and hold [AT/TUNE] during transmission to start tuning. ◆◆If 60 seconds lapse and no matching is established, the tuning automatically ends. In this case, the antenna tuner circuit is switched Off, "AT", ">T" and "RT" appears on the main screen. "R>" appears while an external antenna tuner is active. The preset tuning information corresponding to the current transmit frequency is applied to the internal antenna tuner. • If you change the transmit frequency, the preset tuning information followed by the preset band will be automatically configured for the internal antenna tuner. • To deactivate the internal antenna tuner, press [AT/TUNE] again. Preset Band (MHz) for the Internal Antenna Tuner 0.03 to 1.85 14.10 to 14.50 1.85 to 2.50 14.50 to 18.50 2.50 to 3.525 18.50 to 21.15 3.525 to 3.575 21.15 to 21.50 3.575 to 3.725 21.50 to 25.50 3.725 to 4.1 25.50 to 29.0 4.1 to 6.9 29.0 to 30.0 6.9 to 7.05 30.0 to 51.00 7.05 to 7.1 51.00 to 52.00 7.1 to 7.50 52.00 to 53.00 7.50 to 10.50 53.00 to 60.0 10.50 to 14.10 4-24 Index Contents