User manual

20
Personal PA
®
DSP FM Wideband Transmitter
2. RF SETTINGS
The RF Settings provide the ability to change the broadcasting Channel, RF Output Power level, and the RF time-out delay.
2a. Channel (or Frequency)
The Channel setting allows the channel number or corresponding frequency to be selected. Note: this depends on what display
mode the transmitter is in (see Step 3a). If the transmitter is in channel display mode, channels 1-17 or 1-8 can be selected
depending on channel mode. If the transmitter is in frequency display mode, frequencies can be selected from 72.1 MHz to 75.9
MHz.
To change the channel/frequency:
1. Press the Menu button. The display will show “AUDIO SETTINGS” in the selection box.
2. Press the “v” button to display “RF SETTINGS”.
3. Press the “>” button. “RF CHANNEL” will be displayed in the selection box.
4. Press the “>” button to access the Channels/Frequencies. The currently selected Channel/Frequency will be shown in the
selection box.
5. Press the “^” or “v” buttons to change the channel/frequency. Note that the channel changes live (after a few seconds) - it
does not need to be “selected” with another button. The channel/frequency displayed in the selection box is the one that
is active. Refer to the chart below to choose the channel/frequency (Figure 14).
6. When the desired channel/frequency is selected, press the Menu button to exit the menu and return to the main info
screen.
Note: The T45 is shipped from the factory with the frequency pre-set to Channel 1 (72.1 MHz).
Figure 14: Channel/Frequency Selection Chart
T45 Ch Letter Freq (MHz) R35-8 Ch
1 A 72.1 1
2 B 72.3 2
3 O 72.6 3
4 P 72.8 4
5 I 74.7 5
6 R 75.4 6
7 G 75.7 7
8 H 75.9 8
9 C 72.5
10 K 72.2
11 N 72.4
12 D 72.7
13 E 72.9
14 J 75.3
15 S 75.6
16 T 75.8
17 F 75.5
A376
A425
*Up to 8 channels can be used
simultaneously, and must be channels
identied in this column.
These channels correspond
to the channels available on the
R35-8 Receiver.
These 8 channels have been veried to not
interfere with each other. Outside sources
of RF interference may limit how many
of these channels may be used.
*
2b. RF Output Power
The T45 has three selectable transmitter power levels: FULL, MEDIUM (-10dB), LOW (-20 dB), and RF OFF. By default the T45
is set to “FULL” power mode. For general listening applications, “FULL” power is the preferred mode of operation. Full power
provides the T45 with an operating range of up to 1000 ft (dependent on the environment).
For special listening applications, it may be desirable to reduce the overall operating range on the T45 if:
1) The audio transmission is to be contained to a “smaller” listening area; 2) The signal is too strong and it is overloading the
receiver; or 3) Multiple T45 transmitters are used in adjacent classrooms where the FM signals overlap each other. In these cases,
the power level on the T45 can be reduced to -10 dB or -20 dB. The RF output may be temporarily set to OFF (no power) to help
troubleshoot interfering or overlapping RF signals.