(3) Plug your audio cable into the rear-panel audio-output connector of the R-27
receiver and connect the opposite end to your audio equipment (camera mic input,
mixer console, recorder, etc.). The audio output connector is a standard full-size XLR;
see below for wiring information.
Note: The receiver output is balanced; for single-ended (unbalanced) applications,
connect the audio shield to Pin #1 and the center conductor to Pin #2. Do not connect
Pin #3; doing so will cause distorted audio. Output will be 6 dB less for the single-
ended output mode than for the balanced mode.
(4) Turn “on” the receiver by setting the front-panel power switch to “ON”. The PWR
(rightmost) LED should illuminate. If not, the battery may be weak or dead.
(5) Verify that the transmitter has a fresh battery installed and that the microphone is
connected correctly. Turn “on” the transmitter.
(6) Place the transmitter in a pocket or attach to clothing or body with the belt clip
supplied, or with tape. Keep the antenna as high and vertical as possible.
NOTE: Attaching a rubber band to the end of the antenna and pinning the rubber band
to clothing with a safety pin is an excellent way of keeping the antenna oriented
properly while giving the user freedom to move without causing strain on the antenna.
(7) Turn the transmitter “on”, and position it in the approximate center of the area to be
covered by the wireless system. The R-27 receiver TX LED should illuminate; if not,
then difficulties are indicated (e.g., defective transmitter, receiver, or antenna, excessive
operating range, or severe RF propagation problems). Refer to section “In Case of
Difficulty”.
(8) Verify that the transmitter “MIC” switch is “on”. The audio levels should now be
set for the system. With the microphone correctly positioned, speak loudly into it. If
necessary, turn the audio gain on the transmitter up or down. Also, if necessary, adjust
the receiver “LVL” control.
(9) Readjust the transmitter mic level control, if necessary. When speaking loudly, the
“MIC OVERLOAD” indicator (if one is present) on the transmitter control panel should
flash on the loudest voice peaks. This indicates that the transmitter is at approximately
the point where soft gain compression is occurring in the microphone preamplifier. If
the system is correctly set up, the compression point will be reached only rarely. Setting
the mic level correctly maximizes the system signal-to-noise ratio while ensuring
optimum audio quality. If the mic level is set too high, thumps or pops due to overload
may occur; if set too low, the system may “noise-up” at times.
(10) Audio phasing, if important, should also be checked at this time. Because of
differences in lavalier microphones, it is not possible to be sure that two different types
of microphones have the same phase. If the console or recorder does not have a phasing
switch, it may be necessary to reverse the wiring in the audio cable from the receiver.
(11) No adjustments should be made inside the transmitter or receiver for normal
operation or use. Due to the great possibility of causing improper operation or even
damage to the transmitter or receiver, only qualified and experienced technicians should
open the case. Unauthorized adjustments or repairs inside the equipment case can void
your warranty and cause unnecessary repair costs. If you believe that internal
adjustments or repairs are needed, we recommend that you contact the factory or your
nearest Vega authorized service center.
Wireless-Microphone Receiver
5
