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Making and Checking RF Settings (UHF)
Select the channel with the most difficult conditions as the desired channel, and perform an operation
test with the desired channel (single channel). Determine and optimize antenna installation positions and
orientation that will be difficult to change later, and decide on number of antennas and gain settings.
Step 2 Antenna Installation and Setup
Selecting the desired channel
5 Power up all TX except one, and position the TX within the envisioned service area at the
location closes to the antenna.
Example: In a 12-channel system, turn one TX off and turn the eleven other TX on.
* Equipment other than TX (RX, boosters, etc.) should be constantly on.
6 Use the RF level meter on the RX that is being set up to check the level of third-order
intermodulation noise in the channel of the TX that is off.
Sample settings for checking (RF raised to make noise easier to detect)
Band to use: Band established in step 1.
Group to use: Group established in step 1.
Antenna installation location/orientation: Refer to “Antenna installation position” (page 43).
Antenna gain: Refer to “Booster gain setting conditions” (page 44).
Number of antennas: Refer to “Antenna installation position” (page 43).
TX RF power: 10 mW
RX attenuator: 0 dB
Checking procedure
Check the RF level meter indication.
7 Power down a different TX and repeat steps 5 to 6.
Check all channels.
Example: In a 12-channel system, perform the procedure 12 times.
8 Designate the channel with the highest noise level as the desired channel.
Note
When using multiple RX units in a cascaded configuration, the third-order intermodulation noise of each
RX will be added up, so that noise may be highest at the last channel.
* However, this depends on the channel plan and the number of channels, and may not always apply.
Procedure
Noise in last channel may be highest
Configuring a DWX System
