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Operation: Frequency Considerations
The successful operation of an RF wireless system greatly depends on two things:
1) The frequencies used must avoid interference from competing signals, such as television
broadcast.
2) The frequencies used must not interfere with each other. Selected frequencies need to be
carefully calculated for sufficient spacing, and to avoid creating disruptive interference known as
intermodulation.
Geographic location plays a major role in the performance of your wireless system. The primary source
of competition is television broadcast transmission towers. It is likely that one or more television
stations will be broadcasting within range of your wireless system, creating sources of interference.
In planning your systems’ frequency requirements, it is advisable to determine what frequencies are
in use by local television stations. Sennheiser’s website, www.sennheiserUSA.com, has an interactive
Frequency Finder which can assist in identifying the local TV stations broadcasting in your area.
Local television stations are not the only source of interference, so having a complete knowledge of
your RF environment is an important step in planning your wireless microphone system.
To provide users with additional flexibility to avoid interference, evolution wireless G3 systems are
available in three distinct frequency ranges (A, G, B). Each range contains 1,680 user-selectable
frequencies and 20 “Banks” of coordinated frequency presets, known as “Channels.” For proper
multi-channel setup, all units in a frequency range should be set to the same Bank, each to a different
available Channel.
All G3 systems include an easy-to-use EASY SETUP process, which ensures your units are set to fully
compatible frequencies that avoid local interference.
Easy Setup / Scan New List:
1. On the receiver, press SET to enter menu. Press up/down buttons to select “Easy Setup”. Press SET
and choose “Scan New List.” Press SET to start scan.
2. After the scan is complete, the receiver will recommend the “Bank” with the most “Channels” free.
Press SET. Select a Channel using the up/down arrows and press SET to confirm. The receiver will
say “STORED.”
3. Tap the POWER button to exit the menu. The new selected frequency will be displayed. You should
see little to no RF activity on the meter (meaning, you are on a free channel).
4. Power up the transmitter you wish to pair with the receiver. Locate the transmitter’s infrared
(IR) port. On a G3 handheld transmitter, the port is located on the LCD display. On a bodypack
transmitter, it is located inside the battery compartment, to the right of the ON/OFF button.
5. For a rack-mount (EM) receiver, press the “SYNC” button on the front of the receiver. On a
portable (EK) receiver, press SET and use the up/down button to find “Sync.” Press SET. Hold
the transmitter‘s IR port in front of the receiver’s IR port, which is located on the left side of the
display. Be sure to align the IR ports so they face each other, approximately 1” to 2” apart.
6. If the SYNC is successful, you will see a "
" on the receiver screen. If you see an “X”, SYNC failed
and you should repeat step 5.
7. After a successful SYNC, you should see the same frequency displayed on both the receiver and
transmitter.
8. If setting up another system in the same frequency range (A/B/G), you can repeat the process
from Step 1. Make sure to choose the same BANK number as you did in step 2 to ensure compatible
operation, and a different channel number.