Operation (Continued)
5.SQUELCH CONTROL: This control is used to control or eliminate receiver background noise in the absence of an incoming signal. For maximum receiver sensitivity, it is necessary that the control be adjusted only to the point where the receiver background noise is eliminated. Turn fully counterclockwise and then slowly clockwise until the receiver noise just disappears. Any signal to be received must now be slightly stronger than the average received noise. Further clockwise rotation will increase the threshold level that a signal must overcome in order to be heard. Only strong signals will be heard at a maximum clockwise squelch setting.
6.RF GAIN CONTROL: This control is used to reduce the receiver's front- end gain when receiving strong signals.
7.CLARIFIER CONTROL: Allows variation of the receive frequency above and below the selected receive frequency as shown on the display. This control is intended primarily to tune in SSB signals when communicating with several stations that may not be exactly on frequency. It may also be used to optimize AM/FM signals as described in the operating procedure paragraph. The clarifier can adjust the receive frequency ±2.5KHz but does not affect the transmit frequency or the frequency display.
8.MODE SWITCH: This switch allows you to select one of the following
six operating modes: FM, AM, USB, LSB, CW and PA.
9.NB/ANL BUTTON (NB/ANL): The noise blanker (NB) is very effective in eliminating repetitive impulse noise such as ignition interference. In the ANL position, the AUTOMATIC NOISE LIMITER also limits noise at the receiver audio stages.
10.ROGER BEEP BUTTON (R.BEEP): This switch activates the ROGER BEEP circuit, when its function is selected. When enabled, the radio automatically transmits an audio tone each time you release the PTT. This indicates the end of each transmission so that stations who may
Operation (Continued)
be having trouble receiving will know that you have finished transmitting. This feature is sometimes used in weak signal conditions or other special circumstances. We discourage use of this feature in normal operation, as it can be annoying to other operators.
11.SPLIT BUTTON (SPLIT): Enables the offsetting of the transmitter frequency by up to ± 2 MHz (programmable) for FM repeater operation.
12.PROGRAM BUTTON (PRG): Used to
13.MANUAL BUTTON (MAN): Used to return the unit to manual mode.
14.SHIFT BUTTON (SHF): Determines which digit will change when changing frequencies, by placing a “cursor” under the desired digit. Allows frequency to be changed in 100 Hz, 1KHz, 10KHz, 100KHz and 1 MHz increments.
15.DIM BUTTON (DIM): This button adjusts the display backlighting in four different steps to best match the ambient light.
16.SWR BUTTON (SWR): Used to check relative SWR.
17.SCAN BUTTON (SCAN): Used to enable the scanning of frequencies. See the PROGRAMMING and SCANNING section of this manual for detailed information on using the scan control.
18.MEMORY BUTTON (MEM): Used to program often used frequencies in memory. Detailed information on how to use this control is provided in the PROGRAMMING section of the manual.
19.ENTER BUTTON (ENT): Used to program frequencies in memory. See PROGRAMMING section.
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