display will revert back to showing
tSt.
If you leave the
ToneLCD in the test mode for more than 60 seconds, the device
will automatically leave the Setup mode without saving any
changed parameters.
•
LCd –
This setup parameter is used to flip the LCD display
upside down, as well as reversing the Up and Down switch
functions. This is useful if you are mounting the ToneLCD in
different orientations.
•
Axx –
Where xx is a number between 0 and 31. This value
establishes the audio level passed between the Audio In and the
Receive Audio Output pins. Maximum signal is achieved when
a value of 31 is selected. A value of 0 completely attenuates the
audio path.
You can exit the setup parameter menu by pressing and holding the
MODE
button for 1 second. This will cause the ToneLCD to retain the parameters
you have just set. Alternatively, if you don’t press any keys for a minute or
so, the ToneLCD will automatically exit the setup mode, without saving the
parameters.
Operation
The ToneLCD has 4 modes of operation selected by momentarily pressing
the
MODE
button:
1.
Off
– No CTCSS tone transmitted and the receive path is enabled.
2.
t –
The
CTCSS tone is transmitted but the receive tone squelch is
disabled.
3.
tr –
Both CTCSS transmit and receive squelch modes are enabled.
4.
If ---, or a blinking tone value is shown on the display, then the
ToneLCD is in the FIND mode. In the FIND mode the ToneLCD
samples the Audio In line and if it ‘hears’ a valid CTCSS tone on the
receive audio it shows the values as a blinking set of digits on the
display. If no valid CTCSS tone is sensed, --- is displayed. In the
FIND mode, if a valid CTCSS tone is present for approximately ½
second, the ToneLCD’s tone frequency is set to that tone. This allows
a semi automatic mode of operation. If the ToneLCD finds a valid
tone, the next time you key up you will be transmitting on that same
tone.
When you are in the
Off, t or tr
operating modes, pressing the
UP
or
DOWN
buttons will cause the active CTCSS tone frequency to be moved
