RFCAST – MT100. Rev. 2: 06-12-04
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In order to change the AC operating voltage it is necessary to change the switch inside the
transmitter on the front of the power supply. Sliding this switch right or left makes the
selection for 110 or 220 VAC operation. To access the power supply switch you will need
to remove the top cover of the MT100 or the switch may also be accessed through the
transmitter front panel by removing the four (4) corner screws on the front of the OME-1T
stereo exciter then sliding it forward out of the way. Look into the slot where the exciter
was mounted using a battery operated light and locate the power supply selector switch
(approximately 9 to 10 inches from the front panel) and make the proper selection.
Replace the OME-1T or the transmitter top cover and replace all screws and hardware
unless a change of operating frequency is necessary before operating the transmitter.
Frequency Of Operation Change
The MT100 transmitter operating frequency at time of shipment from the factory may not
be set for your authorized frequency. In order to change the frequency of operation,
locate, the OME-1T exciter section of this manual and review the information on page 4 of
4. After review the frequency setting examples in this section, substitute your values for
the switch settings through the OME-1T chassis top. You should make sure that the
transmitter is unplugged and that no power present.
To access the frequency change selector switches may be necessary to remove the four
(4) screws on the front of the OME-1T and slide it forward far enough to allow a small
screw driver blade to adjust the three (3) rotary frequency selector switches.
Output Power Setting
Please refer to the earlier section entitled RF Power Control in section 3.4 of this manual.
Other Exciter Settings
Please refer to the OME-1T exciter section of this manual, page 4 of 4, for jumper settings
for left and right channel preemphasis selection (75 microseconds un-preemphasized, or
50 microseconds), left and right input sensitivity selection (6..9dBm, 3..6dBm or 0..3dBm),
modulation limiter selection (On or Off), and input selection (Mono, Multiplex Internal, or
Multiplex External). This page of the manual shows the various positions for the jumpers
and their location on the OME-1T printed circuit board.
