The 2-minute timer resets and starts a new count each time the micro- phone switch is pressed. To transmit for more than 2 minutes, release the micro- phone switch briefly and then press it again. The microprocessor then waits until the push-to-talk switch opens to sound the two beeps. A stuck microphone switch will prevent you from hearing received signals, or the two warning beeps. When it turns off the transmitter, the microprocessor switches the transceiver to receive operation. This timing feature protects the ATC channel from long-term interference. Most intentional transmissions last much less than 1 minute, a 2-minute transmission is most likely the result of a stuck microphone switch. (The TX annunciator on the transceiver control unit will be illuminated whenever the transmitter is transmitting.) If the transmitter is still transmitting at the end of 2 minutes, the microprocessor turns it off. Each time the push-to-talk switch is depressed, the microprocessor in the transceiver starts a 2-minute timer. After a frequency has been stored in memory, it will remain there until changed by using the STO switch Memory is retained even when the unit is turned off for an extended period of time.
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If more than 5 seconds elapse, the control will revert to the normal modes of operation and the second store command will be interpreted as the first store command. NOTE When storing a frequency, the second actuation of the STO switch must be done within 5 seconds after selecting the channel number or the first actuation of the STO switch.
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TM 1-1510-223-10 the desired channel number has been selected, push the STO switch again to store the frequency.