TN110 Channel and Frequency Selection
MT-3/4 Radio Systems
TECHNICAL NOTES
Page 2 of 4
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TN110, REV 4-0-0, © Aug 2016
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There are 3 diff erent ways to change the channel and bank of a transmitter / receiver module:
1 The user can set jumpers mounted on the motherboard for each Channel Select signal line (set of four for
each Tx / Rx module) and Bank A/B select line. These jumpers can be used to permanently set a subrack
slot at a specifi c channel and bank.
• Jumpers can be set for 0 (0 Vdc) “down” or 1 (+9.5 Vdc) “up”.
• Pull-up resistor jumpers to +9.5 Vdc must be installed.
2 CSEL signal lines and Bank A/B select lines can be controlled externally by a tone remote adapter, a
CI-RC-4M-G2 multiple link controller, or other third party devices.
3 Sixteen-position rotary select switches mounted on the CI-BC-4E base controller can control the CSEL lines
and toggle switches can control the Bank A/B select line. Optionally the CI-RC-4L repeater controller or AC-3E
control card can have a rotary switch added for control of the CSEL signal lines. The control lines can also be
controlled by selecting the channel through a UIC control card.
The Pull-up resistor jumpers to +9.5 Vdc must be removed and all channel select and bank select jumpers must be
installed in the 1 or “up” position for both external control and rotary switch control of channel selection.
MT-4 Modules Frequency Selection
The MT-4 modules operating frequency is selected in standard channel increments through the Radio Service
Software (RSS). Frequencies can be directly entered or selected through the use of a spin button that cycles
through valid frequencies.
Transmitter A Channel Select Switching Control Option
The motherboard can be jumper confi gured to allow switching control of the TXA CSEL lines between a control card
and an external connection such as a tone remote.
Jumpers JU86 to JU93 are installed by default to allow either the A-PNL-AUX96-3 auxiliary connector, or AC-3E /
CI-BC-4E / UIC-4 control cards to have control of the Transmitter A channel select lines. This will cause contention
if both a control card and auxiliary connection attempt to change the channel select lines.
Switching control of the Channel Select lines can be selected by use of two General Purpose Inputs. GPIO22 and
GPIO23 allow for the use of a connection to Ground to enable or disable local control.
GPIO22 - Ground disables local (AC-3E / CI-BC-4E / UIC-4) control & enables auxiliary control.
GPIO23 - Ground enables local (AC-3E / CI-BC-4E / UIC-4) control & disables auxiliary control.
To allow switching control of the channel select lines remotely, remove jumpers JU86 to JU93, and install jumpers
JU94 to JU101, then install jumper JU102 or JU103 to determine if an active low will enable or disable the local
control of the channel select control.
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