To Select The Tx Offset; To Program A User-Deþned Tx Frequency; To Select The Receive Pl/Dpl Code - Motorola GP68 Service Manual

GP68 Portable Radios Service Manual
When the frequency selection passes the upper
or lower limit, the radio loops to the opposite limit
and sounds a wrap-around tone.

To Select the TX Offset

For the GP68, the transmit frequency can be the same as the
receive frequency (no offset), it can have a standard positive
or negative offset, or it can be a user-defined TX frequency.
NOTE
The Tx Offsets are only visible on the Dealer
Programmable GP68. The offsets are not
shown on the User GP68.
1 Momentarily press
standard positive or negative offset, or user-defined TX
frequency. The offset mode is set according to the table
shown (Table 4-2).
Table 4-2 TX Offset Modes.
Indicator(s)
None
+
-
+ -
The indicator(s) light according to which corresponding
mode is currently selected, and the LCD displays the TX fre-
quency whenever the radio is keyed (for example, see
Figure 4-14).
Figure 4-14 .
To Program a User-Defined TX Frequency
Press and hold until the "+ –" indicators begin to
1
flash (takes about 3 seconds). The LCD will display the
current user-defined TX frequency.
You can now enter the desired TX frequency either
2
directly via the numeric keypad or by rotating the Chan-
nel Selector Knob and scrolling through the available
frequencies (according to the selected frequency step
size).
If using the keypad to enter a user-defined TX fre-
3A
quency, either completely key in the desired frequency
or, to fill in trailing zeros, press the Enter Button. Once
the frequency is fully entered, press the Enter Button
again to exit the user-defined entry mode and commit
the selected TX frequency.
March, 1997
to toggle between no offset,
Offset Mode
No offset (simplex)
Standard Positive Offset
Standard Negative Offset
User-defined TX Frequency
+ −
The radio automatically exits the user-
defined entry mode after 5 seconds of inactiv-
ity and commits the selected TX frequency
ONLY if you have completely keyed in the
desired frequency (a partially-entered fre-
quency is NOT stored by the radio).
If using the Channel Selector Knob to enter a user-
3B
defined TX frequency, press the Enter Button to com-
mit the selected TX frequency and return to normal
operating mode (the radio automatically does this after 3
seconds of inactivity).
3
Figure 4-15 Programming a User-Defined TX
When receiving in MHz mode, the radio dis-
plays the selected RX frequency; when trans-
mitting, the radio displays the selected TX
frequency.

To Select the Receive PL/DPL Code

There are 126 different Receive PL/DPL codes available,
numbered from 001 to 126 (see Table 4-3, Receive and
Transmit PL/DPL Codes, on page 4-9). Receive PL/DPL
code '000' represents Carrier squelch.
From the frequency mode, press and hold
1
the LCD displays 'rPL." followed by the active Receive
PL code number (takes about 3 seconds). In the follow-
ing example (Figure 4-16), the Receive PL/DPL code is
014.
2 Rotate the Channel Selector Knob clockwise to
increase, or counter-clockwise to decrease, the active
Receive PL/DPL code.
6881086C09-O
Radio Programming Information
Programming the GP68 Radio
NOTE
2
1
2
Frequency.
NOTE
CTCSS
Figure 4-16 .
SQL
B until
4-7