1-5
Revised July 1999
Part No. 001-7500-002
GENERAL INFORMATION
FIVE-TONE ENCODER/DECODER
PART NO. 585-7500-026
SETUP INSTRUCTIONS
1.13 FIVE-TONE ENCODER/DECODER SETUP
1.13.1 INSTALLATION AND PROGRAMMING
1. Remove the battery pack from the transceiver and
install the module in the cavity under the rubber
cover as described in Section 1.11.
2. Program the transceiver for operation with a five-
tone module as described in Section 3. Screens that
need to be programmed with five-tone decoder
information are as follows. Refer to on-line help for
information on parameters in these screens (press
F1 with parameter selected).
Model Menu - “PMR” must be selected (see
Section 3.4.6).
Select the following in the Screen Menu:
•
“Rx Code CH” and program the information in
the screen (see Section 3.5.2).
•
“Tx Code CH” and program the information in
the screen (see Section 3.5.2).
•
“5Tone Format” and program the information in
the screen (see Section 3.5.2).
•
“Memory CH” and program the parameters in
this screen that are related to 5-Tone operation
on the channel (see Figure 3-2).
NOTE: If performing the deviation adjustment in
the next section, the long tone must be turned on in
RPT/STN/ID on the Memory Channel screen.
•
“Key & Display Assign” and program Tx Code
and Call switches for use in transmitting 5-tone
codes.
1.13.2 SETTING 5-TONE DEVIATION
The only adjustment on the 5-tone module is a
potentiometer for setting the transmit tone deviation.
This control is factory preset and should not require
readjustment in the field. However, if adjustment is
required, proceed as follows:
1. Monitor the transmit signal with a communications
monitor. Set it for HPF = Off, LPF = 20 kHz, De-
emphasis = Off, and Level = (P-P)/2.
2. Select a channel near the center of the band and turn
a long tone on (see preceding “NOTE”) by pressing
the appropriate front panel key.
3. Adjust potentiometer R18 (DEV) on the 5-tone
module for the following deviation:
25 kHz Channel Spacing - ±3.5 kHz
20 kHz Channel Spacing - ±2.8 kHz
12.5 kHz Channel Spacing - ±1.7 kHz
4. Check channels on each end of the operating band
to make sure deviation is within the following
limits. If not, repeat preceding adjustment.
25 kHz Channel Spacing - ±3.0 to 5.0 kHz
20 kHz Channel Spacing - ± 2.4 to 4.0 kHz
12.5 kHz Channel Spacing - ±1.5 to 2.5 kHz