Raymarine RAY 210VHF - Manual (Page 29)

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17) [DIM] (Dimmer) key :
The [DIM] key changes backlighting level for the front panel. The backlighting
is in the off condition when the RAY210 is first turned on. There are four levels
for front panel illumination (high, medium, low, and off), Pressing the [DIM]
key one time turns the backlight to its brightest setting (high). Each subsequent
press of the backlight key decreases the level of illumination. Once the backlight
is decreased to the “off” condition, the next press of the [DIM] key returns the
backlight to high.
18) [VOLT] (voltmeter) key :
Pressing this key will activate the unique digital voltmeter feature for fast
verification of input DC voltage to your RAY210.
To activate the voltmeter, press [VOLT] key. The display will then show the
input DC voltage for five seconds, then will return to previous operation.
19) [D/L] (sensitivity) key :
The receiving sensitivity is changed by pressing this key. When the RAY210 is
turned on, sensitivity is set high. To reduce receiving sensitivity, press [D/L]
key. When at low sensitivity setting "DESENS11 is displayed on the LCD.
Note: When your radio is interfered with by pagers, land mobile and TV signals,
your RAY210 can eliminate the interference by utilizing the desensitising
function.
20) Microphone PTT (Push-To-Talk) Switch :
When pressed puts the radio into the transmit mode, and a “TX” is displayed on
the LCD. Bar segments of 1 through 3 will illuminate when the PTT switch is
depressed at 1 Watt. Bar segment 4 will illuminate when modulation is detected.
At 25 Watts, segments 1 through 6 will illuminate when PTT is depressed and 7
will display when modulation is detected.
21) Microphone 16/9 switch :
This switch has the same function as that of the main unit.
22) Microphone Up/Down Channel Switches :
These keys located on the right side of the microphone (labelled CH) allow the
operator to switch radio channel by simply pressing the appropriate arrow. The
channel number can be increased or decreased one with each press, or if held
will continue to increase or decrease the number as long as the key is held.