3: Operation
PRC1077-MSOP
3-5
Erasing
Frequencies
To erase all the frequencies stored in memory (the Power switch is in the OFF
position):
1. Press and hold the CHAN SET button; turn and hold the Tuning control
MHz switch up
2. Turn the Power switch from the OFF position to the LOW position. This
causes the radio to reset all programmed frequencies to 00.000 MHz.
3. Release the Tuning control MHz and the CHAN SET button.
Setting Different
Transmit and
Receive
Frequencies
Semi-duplex operation is when the PRC1077 transmits and receives on
different frequencies. This type of setup is typically used for operating
through a repeater system (
refer to "Repeater Operation" on page A-2
).
To set the PRC1077 to semi-duplex operation:
1. Turn the Power switch to the LOW, MED, or HIGH position.
2. With the Channel switch, select one of the preset channels and set it to the
desired receive frequency (
refer to "Presetting Channels 1 to 9" on page
3-4
).
3. Press and hold the CHAN SET button.
4. Press and hold the handset PTT button.
5. With the CHAN SET button and handset PTT button still pressed, adjust
either Tuning control knob (MHz or kHz) up or down to set the transmit
frequency. The transmit frequency is displayed in the LCD.
6. Release PTT and CHAN SET button (sequence is not important).
Once the transmit frequency is set, and PTT is pressed, the transmit fre-
quency is displayed in the LCD. When PTT is released, the receive fre-
quency is displayed.
Jamming Recognition and Identification
Jamming refers to the transmission of radio signals that disrupt or interfere
with communications within a radio system. The source of the jamming
signals can be from an enemy radio, or it can be unusual channel noise or
interference from a local noise source. It is also possible that a faulty receiver
can cause internal interference to the received signal.
To determine the source of the interference, perform the following checks:
Action
Indication
Remove the antenna.
If the noise continues, the receiver is the probable
noise source.