Revision 2.2
5-16
ChannelMaster TX1 Transmitter
5.7 Nextel BAS Relocation Settings
For our US clients, the ChannelMaster is designed so that, when properly configured
per the following guidelines, you will only need to change one setting on one screen
when it’s time to switch over to the “post-Nextel” 2 GHz band plan.
To preset the unit to allow a “one setting” switchover, there are two groups of settings
that must be made in advance: “AUDIO SUB-CARRIER FREQUENCY” and “CHANNEL
BANDWIDTH & BAND PLAN”. These are described below.
5.7.1 Audio Sub-Carrier Frequency
In this section, you set your “pre-Nextel” and “post-Nextel” Audio Sub-Carrier (ASC)
frequencies, so that when you make the switchover they will be ready to go.
Start the ASC set-up procedure by making the following menu selections:
MENU>MODULATION>PARAMETER SETUP>FM>AUDIO
This brings up a screen similar to the one at right, with
the settings and selections as described below:
All ASC’s are modified in the same fashion. ASC#1 is used as the example.
2(17)/7/13 This setting controls the frequency for the selected Sub-Carrier when
operating in the “pre-Nextel” 2 GHz band (USA), as well as for all the
other frequency bands (i.e. 7 GHz or 13 GHz). The possible range for
this setting is 4.83 MHz to 8.5 MHz. (Refer to Section 5.2.1 -
Changing Operating Frequency.)
2(12) 1-7 This setting controls the frequency for the selected Sub-Carrier when
operating in the “post-Nextel” 2 GHz band (USA) on channels 1
through 7. The possible range for this setting is 4.83 MHz to 5.8 MHz.
(Refer to Section 5.2.1 - Changing Operating Frequency.)
2(12) 8-10 This setting controls the frequency for the selected Sub-Carrier when
operating in the “post-Nextel” 2 GHz band (USA) on channels 8
through 10. The possible range for this setting is 4.83 MHz to
8.5 MHz. (Refer to Section 5.2.1 - Changing Operating Frequency.)
Nucomm’s Default Audio Sub-carrier Frequencies
Band-plan
ASC1 ASC2 ASC3* ASC4*
2(17)/7/13 4.83 MHz 6.20 MHz 6.80 MHz 7.50 MHz
2(12) 1-7 4.83 MHz 5.80 MHz 6.80 MHz 7.50 MHz
2(12) 8-10 4.83 MHz 6.20 MHz 6.80 MHz 7.50 MHz
*NOTE: Due to bandwidth limitations, only two ASC’s can be active on the “post-
Nextel” 2 GHz band-plan (US), regardless of how the unit is hardware configured.
(-20 to -40dBc)
2(17)/7/13: 4.83 MHz
2(12) 1-7: 4.83 MHz
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