19537P-26 (11-14)
B1
Appendix B
M-RIM Adjustments
Transmit Audio Level Adjustments
Under most circumstances these adjustments have been pre-set to optimum levels and should never
need to be performed in the field. However, they are included in this section should their adjustment
be necessary.
To increase or decrease the transmit mic audio level for each radio, remove the top cover and locate
and adjust the appropriate potentiometer (
See Figure B1 for the locations of these components
):
For Radio A, locate and adjust R8
For Radio B, locate and adjust R7
For Radio C, locate and adjust R6
For Radio D, locate and adjust R5
Turning the potentiometers clockwise will increase the levels and counter-clockwise will decrease the
levels. Use a jeweler’s screwdriver to make these adjustments.
Also it is important to not increase the levels so much as to over-modulate the radios. This is in
violation of FCC regulations and will seriously degrade the quality of the transmissions. If you have
the equipment to measure the modulation, 4-4.5 KHz is an optimum level.
Receive Audio Level Adjustments
The factory has pre-set the receive audio adjustment potentiometers to levels which should be
acceptable in most applications. Should the need arise to change these settings, the installer may do
so by the following procedure:
To increase or decrease the receive audio level for each radio, remove the top cover and locate and
adjust the appropriate potentiometer (
See Figure B1 for the locations of these components
):
For Radio A, locate and adjust R83
For Radio B, locate and adjust R20
For Radio C, locate and adjust R18
For Radio D, locate and adjust R16
Turning the potentiometers clockwise will increase the levels and counter-clockwise will decrease the
levels. Use a jeweler’s screwdriver to make these adjustments.
