AKG Acoustics WMS 81, WMS 61 manual Receiver Placement, Rack Mounting Mounting a Single Receiver

9.5.Receiver

9.5.1.Placement

Reflections off metal parts, walls, ceilings, etc. or the shadow effects of musicians and other people may weaken or cancel the direct transmitter signal.

For best results, place the receiver as follows:

1.Place the receiver near the performance area (stage). Make sure, though, that the transmitter will never get any closer to the receiver than 16 ft. (5 m). Optimum separation is 10 ft (3 m).

2.There should always be a direct line of sight between the trans- mitter and receiver.

3.Place the receiver at least 5 ft. (1.5 m) away from any big metal objects, walls, scaffolding, ceilings, etc.

You can either use the receiver free-standing or mount it in a 19” rack using the supplied RMU 60 rack mounting kit.

9.5.2.Rack Mounting Mounting a Single Receiver

a b

c d

Fig. 1: Installing a single receiver in a 19” rack.

1.Place a clamping slide (3) on each rack ear (2), checking that the pegs on the clamping slides (3) engage in the fixing holes on the rack ears (2) as shown in figs. 1a and 1b.

2.Slide the clamping slides (3) and rack ears (2) into the fixing rails on both sides of the receiver (1) from rear to front as shown in fig. 1 c.

3.Tighten the two Phillips screws in the clamping slides (3) CW to fix the rack ears (2) on the receiver (1).

4.Use the supplied screws to fix the supplied blank panel to the left or right rack ear (2) as shown in fig. 1d.

5.Use the supplied installation screws to install the receiver (1) in the rack.

Mounting Two Receivers Side by Side

1.Fix one rack ear (2) to the outside panel of each receiver (1) referring to steps 1 through 3 above.

2.Insert a clamping slide (3) WITH NO RACK EAR (2) into the fixing rails on the INSIDE PANEL of one receiver (1).

3.Insert the receiver (1) with the clamping slide (3) on its inside panel into the fixing rails on the inside panel of the other recei- ver (1).

4.Tighten the two Phillips screws in the inside clamping slide (3) CW to connect the two receivers (1).

5.Use the supplied installation screws to install the receiver (1) in the rack.

9.5.3. Audio Connections

Connect one of the AUDIO OUT sockets to the desired input:

- BALANCED socket (1o) - XLR cable - microphone input: set

BALANCED LINE/MIC switch (1p) to MIC.

-BALANCED socket (1o) - XLR cable - line input: set BALANCED LINE/MIC switch (1p) to LINE.

-UNBALANCED jack (1n) - 1/4” jack cable - unbalanced 1/4” microphone or line input jack. (BALANCED LINE/MIC switch (1p) position is uncritical.)

Important: Never use the two AUDIO OUT sockets simulta- neously! This may cause signal loss or increased noise.

9.5.4. Connecting Antennas

1.Connect one of the two supplied antennas to the ANTENNA A BNC input and the other one to the ANTENNA B input on the receiver rear panel.

2.Point the antennas upward and slightly outward to form a ”V”.

3.SR 61: For optimum reception, make sure to extend the two telescoping antennas exactly as far as specified for each

Frequency Set in Table 1 on page 51.

SR 81: Since the SR 81 is a UHF receiver, it uses fixed-length antennas that you do not need to extend.

9.5.5. Connecting to Power

1.Check that the AC mains voltage stated on the sup- plied AC adapter is identical to the AC mains volt- age available where you will use your system.

Using the AC adapter with a different AC voltage may cause irreparable damage to the unit.

2.Plug the feeder cable on the supplied AC adapter into the POWER socket (1m) on the receiver.

3.Bend part of the feeder cable into a bight, pass the bight through the opening in the lower part of the screwdriver sup- port, and place the end of the bight snugly against the strain relief hook above the POWER socket (1m).

4.Plug the power cable on the supplied AC adapter into a con- venient power outlet.

4.Switch the receiver ON with the POWER switch (1a).

Note: For easy channel identification in a multichannel setup, you can replace the snap fitted color code platelet (1j) with a dif- ferent-color platelet included in the optional Color Coding Kit.

9.6.System Adjustments

1.Handheld transmitter: Using the supplied screwdriver (1r), set the GAIN control (2e) so that on the receiver the green AF LEDs (1h) will light and the red PEAK LED (1h) on the receiv- er as well as the status LED (2b) on the transmitter will only flash

on the loudest signal peaks.

Bodypack transmitter: Using the supplied screwdriver (1r), set the GAIN control (3j) so that the green AF LEDs (1h) will light and the red PEAK LED (1h) on the receiver as well as the status LED (2b) on the transmitter will only flash on the loud- est signal peaks.

2.The red PEAK LED (1h) on the receiver and/or the status LED (2b, 3c) on the transmitter lighting brightly means the transmit- ter is overloaded. Turn the GAIN control (2e) or (3j) on the transmitter CCW to the point that the PEAK (1h) and status (3c) LEDs will only flash occasionally.

3.Set the VOLUME control (1b) on the receiver so that the receiv- er output will optimally drive the connected device (e.g., mixer input). Refer to the instruction manual for the connected device.

4.Check the performance area for "dead spots", i.e., places where the field strength seems to drop and reception deteriorates.

If you find any dead spots, try to eliminate them by reposition- ing the receiver. If this does not help, avoid the dead spots.

5.Check the field strength of the received signal. If the RF LOW