Kenwood TM-231A Instruction Manual

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4-3. TRANSMITTER OPERATIONCautions:1. Ensure that an antenna with a low standing wave ratio(SWR) is attached to the antenna connector before at-tempting to transmit. Failure to provide proper termina-tion may result in damage to the final amplifier section.2. Always check to ensure the frequency is clear beforetransmitting.Note:The use of LOW power is recommended, whenever possi-ble, to avoid interfering with other stations.Transmit1. Select the desired operating frequency using any of themethods previously discussed.2. Check the frequency to see if it is occupied before youtransmit.3. Press the PTT switch. The ON AIR indicator will light,and the RF meter will deflect to the right.Note:If you have selected the LOW power position, the lowindicator will appear in the display and the RF meter willonly deflect slightly. When HI power has been selectedthe RF meter will swing full scale.4. Speak into the microphone. The recommended distanceto the microphone is 5 cm (2 inches).Note:Talking closer may result in overdeviation of your trans-mit signal, which might be reported as a loss of clarityor of an excessively wide transmit signal. Talking too faraway may result in reports of weak audio.205. Release the PTT switch to return to the receive made.The ON AIR indicator should go out, and the RF meterwill return to zero.4-4. MEMORY OPERATIONS4-4-1. Microprocessor Memory back-upA lithium battery is contained in this transceiver to retainmemory. Turning OFF the POWER switch, disconnecting thepower cable or an intermittent power failure will not erasethe memories. The battery life is estimated at 5 years. Whenthe battery has been exhausted erroneous information mightappear in the display.Lithium battery replacement should be performed by anauthorized KENWOOD service facility, or your authorizedKENWOOD dealer. This equipment contains CMOS circuitryand can be damaged by improper replacement procedures.4-4-2. Microprocessor InitializationThe initial state of the microprocessor, as delivered from thefactory is shown in the following chart.