29
Setup Mode Switch Functions
does not show them, nor
mention them, the four Line Select
buttons on the Model 284 remain functional while in the setup mode. The level setting
tests can be done on each of the four lines by using the Line Select keys to choose which
one to work on.
Table 1: Key Functions in Setup Mode
Key #
Function
Description
1
HOURS UP
Used for setting the time of day clock. Press this key multiple times to cycle
the hours upward. Holding the key instead will cycle the hours at an
increasing rate. If the clock option is not installed, this key will have no
function. If the clock option hardware is not installed in the unit but
inadvertently the “clock” is enabled via the PC configuration software, the
display will show “12:00”.
2
MINUTES UP
Used for setting the time of day clock. Similar to the Hours Up key.
3
RX dBm METER
Displays the RX audio level in decibel milliwatts relative to 600
. In a
multiple deskset installation, this can be used to set the transmit level of each
deskset. Since the dBm meter is referenced to 600
, you must have the
terminating resistor jumpers (JP2 and JP4) set to the “A” position for the
reading to be accurate. Press function key 3 again to exit this test.
Note: Normally, the VU meter is post AGC. While this setup mode is active,
the AGC is disabled for correct dBm meter readings.
4
TRANSMIT LEVEL
SET
The one adjustment that needs to be made at the deskset is the transmit level.
This test provides a single tone of either 300, 1000, or 3000 Hz transmit at 0
dBm. Repeated presses of this key cycle between the three tones.
To cancel the test, press function key 9 (typically Monitor), or the CLEAR
key.
To set the level, connect an AC voltmeter or dBm meter (see Key 3) to the TX
audio pair. Adjust the variable resistor marked "TX LVL" for 0 dBm at 1000
Hertz, or 2.19 Volts peak-to-peak (775 millivolts AC RMS). [This will be R3
in the Model 280, and it could be R14, R100, or R99 in a Model 284.]
Note that a transmit function tone sequence is produced when this setup mode
is invoked. This will key up the transmitter on the frequency (F1-F8) that was
selected before the setup mode was accessed. This is a useful way to check the
transmit deviation. If a different frequency is desired, exit the setup mode (via
key 9), select the appropriate frequency, then re-enter the setup mode (via
function keys 1 + 8).
5
HOURS DOWN
Used for setting the time of day clock. Similar to Hours Up.
6
MINUTES DOWN Used for setting the time of day clock. Similar to Hours Down.
7
LINE LEVEL SET This mode is for setting an approximate transmit level in the absence of a Volt
or dBm meter (see key 3). It is only an approximation, but should be sufficient
for most installations. Press this button, then adjust the trimmer resistor
marked "TX LVL" until the VU meter in the LCD display reads +3.5 dBm.
Press the button again to cancel the mode. JP1 (also JP2, JP7, and JP10 in a
Model 284) must be in position “B” for this test to work correctly.
8
12/24 HOUR
CLOCK DISPLAY
Selection of 12 or 24 hour mode for the time of day clock (if the option is
installed).
9
CLEAR / CANCEL
SETUP MODE
This key may be used to cancel a test in progress or if no tests are active,
return the unit to normal operation.
