DR-4000 Series Professional UHF Wireless Systems
DR-4600 Handheld Dynamic Microphone System
DR-4500 Instrument Body Pack System
www.digital-reference.com
19
RF Interference and Finding Open Channels
If you encounter slight interference when the transmitter
is far from the receiver (from other than an operating TV
station on the same frequency), often it can be overcome
by adjusting the receiver‘s SQUELCH control (see page
11 for details).
If you are receiving interference on a selected channel
with the transmitter off, you must reprogram the receiver
and transmitter to a different CHANNEL. To reprogram,
you must first find an open CHANNEL:
• With the associated transmitter off, scroll through the
GROUPS/CHANNELS to find a CHANNEL without
RF Meter bars in the Receiver’s LED meter.
• For optimum interference-free operation, there must
be zero bars on any 3 CHANNELS surrounding the
selected CHANNEL (i.e. the three channels above
and below the selected CHANNEL).
• If operating multiple DR-4000 Series systems
simultaneously, repeat this procedure with every new
CHANNEL selected, with all previously tuned systems
on both transmitters and receivers.
Please note that wireless frequencies are shared with
other radio services.
• According to FCC regulations, wireless microphone
operations are unprotected from interference from
other licensed operations in the band.
• If any interference is received by any government or
non-government operation, the wireless microphone
must cease operation or change frequencies.
• The above statement is valid only for use in the U.S.A.
NOTE: When the transmitter is powered on, full bars on the
RF Meter icon indicate good signal strength. More than 1 bar
showing with the transmitter off also indicates the presence of
likely RF interference on that frequency. If this happens, select
a different GROUP/CHANNEL. One bar or less is ideal for
interference-free operation.
8868 Digital Ref 4600 Manual.indd 19
10/27/09 10:37:18 AM
