Seite 11

Fehler Verzerrungen. Mgliche Ursache Behebung 1. GAIN-Regler zu hoch oder zu nied- 1. Handsender: GAIN-Schalter auf anrig eingestellt. dere Position stellen. Taschensender: GAIN-Regler soweit zurckdrehen oder aufdrehen, dass Verzerrungen verschwinden. 2. Strungen durch andere Drahtlos- 2. Strende bzw. schadhafte Gerte anlagen, Fernsehen, Radio, Funkausschalten oder WMS 40 FLEXX gerte oder schadhafte auf andere Trgerfrequenz umElektrogerte oder -installation. schalten; Elektroinstallation berprfen lassen.
Kurzzeitiger Tonausfall ("Dropouts") an manchen Stellen des Aktionsbereichs.

Antennenposition.

Empfnger an einer anderen Stelle aufstellen. Falls Dropouts bestehen bleiben, kritische Stellen markieren und vermeiden.

6 Technische Daten

Empfangsfrequenz Modulation Audiobertragungsbandbreite Klirrfaktor bei 1 kHz Kompander Signal/Rauschabstand Stromaufnahme Spannungsversorgung Squelch-Einsatzschwelle Audioausgang Abmessungen Nettogewicht 660 - 865 MHz FM 35 - 20.000 Hz typ. 0,8% Ja typ. 110 dB(A) 115 mA/12 V 120/230 V AC, 50/60 Hz -100 bis -70 dBm, regelbar XLR symm. und 6,3 mm-Klinke asymm.: regelbar von Mikrofon- bis Linepegel. Ausgangspegel bei Nennhub: 500 mV eff. 200 x 190 x 44 mm 630 g
Dieses Produkt entspricht den in der Konformittserklrung angegebenen Normen. Sie knnen die Konformittserklrung auf http://www.akg.com oder per E-Mail an sales@akg.com anfordern.

Seite 12

Table of Contents
Page FCC Statement....Safety and Environment....13 1.1 Safety....13 1.2 Environment....Description....14 2.1 Introduction....14 2.2 Packing List....14 2.3 Optional Accessories...14 2.4 SR 40 FLEXX Receiver....14 2.4.1 Front Panel Controls....14 2.4.2 Rear Panel.....Setting Up.....16 3.1 Positioning the Receiver...16 3.2 Connecting the Receiver to a Balanced Input...16 3.3 Connecting the Receiver to an Unbalanced Input...16 3.4 Connecting the Receiver to Power....17 3.5 Setting Frequencies....17 3.6 Before the Soundcheck....18 3.7 Multichannel Systems....18 3.8 Changing Carrier Frequencies (HT 40 FLEXX, PT 40 FLEXX)...Cleaning.....Troubleshooting....Specifications....20 Fig. 6.....57

FCC Statement

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures: Reorient or relocate the receiving antenna. Increase the separation between the equipment and the receiver. Connect the equipment into an outlet on a circuit different from that to which the receiver is connected. Consult the dealer or an experienced radio/TV technician for help.

Shielded cables and I/O cords must be used for this equipment to comply with the relevant FCC regulations. Changes or modifications not expressly approved in writing by AKG Acoustics may void the users authority to operate this equipment. This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.

Seite 13

1 Safety and Environment
1. Do not spill any liquids on the equipment and do not drop any objects through the ventilation slots in the equipment. 2. The equipment may be used in dry rooms only. 3. The equipment may be opened, serviced, and repaired by authorized personnel only. The equipment contains no user-serviceable parts. 4. Before connecting the equipment to power, check that the AC mains voltage stated on the supplied AC adapter is identical to the AC mains voltage available where you will use the equipment. 5. Operate the equipment with the supplied AC adapter with a 12-VDC output. Using adapters with a different output voltage or current type may cause serious damage to the unit. 6. If any solid object or liquid penetrates into the equipment, shut down the sound system immediately. Disconnect the AC adapter from the power outlet immediately and have the equipment checked by AKG service personnel. 7. If you will not use the equipment for a long period of time, disconnect the AC adapter from the power outlet. Please note that the equipment will not be fully isolated from power when you set the power switch to OFF. 8. Do not place the equipment near heat sources such as radiators, heating ducts, or amplifiers, etc. and do not expose it to direct sunlight, excessive dust, moisture, rain, mechanical vibrations, or shock. 9. To avoid hum or interference, route all audio lines, particularly those connected to the microphone inputs, away from power lines of any type. If you use cable ducts, be sure to use separate ducts for the audio lines. 10. Clean the equipment with a moistened (not wet) cloth only. Be sure to disconnect the AC adapter from the power outlet before cleaning the equipment! Never use caustic or scouring cleaners or cleaning agents containing alcohol or solvents since these may damage the enamel and plastic parts. 11. Use the equipment for the applications described in this manual only. AKG cannot accept any liability for damages resulting from improper handling or misuse. 1. The AC adapter will draw a small amount of current even when the equipment is switched off. To save energy, disconnect the AC adapter from the power outlet if you will leave the equipment unused for a long period of time. 2. When scrapping the equipment, separate the case, circuit boards, and cables, and dispose of all components in accordance with local waste disposal rules. 3. The packaging of the equipment is recyclabe. Dispose of the packaging in an appropriate container provided by the local waste collection/recycling entity and observe all local legislation relating to waste disposal and recycling.

1.1 Safety

1.2 Environment

Seite 14

2 Description
2.1 Introduction Thank you for purchasing an AKG product. This Manual contains important instructions for setting up and operating your equipment. Please take a few minutes to read the instructions below carefully before operating the equipment. Please keep the Manual for future reference. Have fun and impress your audience!

2.2 Packing List

1 SR 40 FLEXX receiver
1 AC adapter (see sticker on packaging)
1 Manual Supplement sheet
Check that the packaging contains all of the items listed for your system. Should any item be missing, please contact your AKG dealer. 2.3 Optional Accessories 2.4 SR 40 FLEXX Receiver For optional accessories, refer to the current AKG catalog or folder, or visit www.akg.com. Your dealer will be glad to help. The SR 40 FLEXX is a stationary diversity receiver for use with all WMS 40 FLEXX and Microtools Series transmitters. It features a half-rack case for mounting in a 19" rack. Operating in the 660 MHz to 865 MHz UHF range, the SR 40 FLEXX provides three selectable, quartz stabilized carrier frequencies within the 3-MHz-wide frequency band for which you ordered your WMS 40 FLEXX. This allows you to select a different frequency if one of the three frequencies does not provide adequate signal quality. The frequencies have been factory preset to make sure you can set up a multichannel system* with up to three channels with three kits operating in the same frequency band. Using a suitable combination of kits operating in different frequency bands you can even use up to nine channels simultaneously. The SR 40 FLEXX is a diversity receiver and uses two antennas in order to receive the transmitter signal at two different spots. The diversity electronics will automatically activate the antenna that delivers the better signal. An adjustable squelch will mute the receiver if the received signal is too weak so the related noise or the self-noise of the receiver will not become audible when the transmitter is switched OFF.
*Ask your dealer about usable frequency bands for WMS 40 FLEXX systems with more than three channels.
2.4.1 Front Panel Controls
Fig. 1: Front panel controls on SR 40 FLEXX receiver. Refer to fig. 1.
1 Antennas: Fixed-length UHF antennas permanently mounted on the front panel. The diversity circuit will automatically activate the antenna that provides the better signal. 2 ON/OFF: On/off pushbutton switch. If the DIVERSITY LEDs A and B flash alternately and the RF MUTE LED is lit constantly, the receiver is ON but receives no signal. If the RF OK, AF OK, and only one of the two DIVERSITY LEDs are lit, the receiver is ON and receives signal. When you switch the receiver OFF, all LEDs will extinguish. 3 RF LEDS: These LEDs indicate the quality of the received RF signal. SR 40 FLEXX

Seite 15

3a OK (green): This LED is lit to indicate that an RF signal of adequate strength is being received. 3b MUTE (red): This LED is lit to indicate that no signal is being received or the squelch is active. In either case, the audio output will be muted automatically. 4 DIVERSITY LEDs A and B: Indicate which of the two receiving antennas is active at any time. 5 Color code: The color indicates the carrier frequency band of the receiver. Transmitters and receivers tuned to the same frequency band are marked with the same color. Refer to the Manual Supplement sheet for a color code table. 6 AF LEDs: Indicate the received audio level: 6a OK (green): -30 dB to +3 dB 6b CLIP (red): >3 dB. This LED illuminates to indicate the audio level of the received signal is overloading the receiver's audio section. The green AF OK LED being lit and the red AF CLIP LED flashing occasionally indicate optimum modulation. If none of the LEDs is lit, the gain setting on the transmitter is too low. 7 VOLUME: This rotary control adjusts the receivers output level from microphone to line level for matching to the input sensitivity of your mixer or amplifier. The control range is 26 dB. 8 Frequency selector: This slide switch tunes the receiver to one of three different carrier frequencies within the receiver's carrier frequency band.
Refer to fig. 1 on page 14.

2.4.2 Rear Panel

Fig. 2: Rear panel of SR 40 FLEXX receiver. Refer to fig. 2.
9 Carrier frequency label: A label indicating the name of the carrier frequency band and the three carrier frequencies of your receiver is affixed to the rear panel of the receiver. 10 AUDIO OUT/BALANCED: Balanced 3-pin XLR audio output for connecting to, e.g., a microphone input on the mixing console. 11 AUDIO OUT/UNBALANCED: Unbalanced audio output on a 1/4" TS jack for connecting to, e.g., a guitar amplifier. 12 Strain relief for the feeder cable of the supplied AC adapter. 13 DC ONLY: Input connector for the supplied AC adapter. 14 SQUELCH: The squelch circuit switches the receiver off if the received signal is too weak, in order to suppress the related noise or the residual noise of the receiver while the transmitter is off. Set the SQUELCH control to minimum before first switching the receiver on.

Seite 16

3 Setting up

Important!

Before setting up your WMS 40 FLEXX, make sure to set the frequency selectors on the transmitter and receiver to the same frequency (1, 2, or 3). If the transmitter and receiver are tuned to different frequencies, no signal will be transmitted! Never use the two audio outputs (BALANCED and UNBALANCED) simultaneously! This may cause signal loss or increased noise. You can either use the receiver freestanding or mount it in a 19" rack using the optional RMU 40 PRO rack mounting kit. For instructions on how to rack mount the receiver, refer to the RMU 40 PRO manual. 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 10 ft (3 m). Optimum separation is 16 ft. (5 m). 2. Check that you can see the receiver from where you will be using the transmitter. 3. Place the receiver at least 5 ft. (1.5 m) away from any big metal objects, walls, scaffolding, ceilings, etc.

3.1 Positioning the Receiver
3.2 Connecting the Receiver to a Balanced Input
Fig. 3: Connecting the receiver to a balanced mixer input. Refer to fig. 3.
1. Use a standard XLR cable to connect the BALANCED output (10) on the receiver rear panel to a balanced XLR microphone input on the mixer. 2. Turn the VOLUME control (7) on the receiver front panel all the way CCW to set the receiver output to microphone level.
3.3 Connecting the Receiver to an Unbalanced Input
Fig. 4: Connecting the receiver to an unbalanced mixer input. Refer to fig. 4.
1. Use a standard 1/4" jack cable to connect the UNBALANCED jack (11) on the receiver rear panel to an unbalanced 1/4" line input on the mixer. 2. Turn the VOLUME control (7) on the receiver front panel all the way CW to set the receiver output to line level. To avoid hum interference, do not use audio cables that are longer than 10 feet (3 m)!

Seite 17

3.4 Connecting the Receiver to Power
Fig. 5: Connecting to power. 1. Check that the AC mains voltage stated on the included power supply is identical to the AC mains voltage available where you will use your system. Using the power supply with a different AC voltage may cause damage to the unit. 2. Point the antennas (1) upward. 3. Plug the feeder cable on the included power supply into the DC ONLY socket (13) on the receiver. 4. Bend part of the feeder cable into a small bight, pass the bight through the strain relief (12) from above, and slip the bight over the hook on the strain relief (12). Tighten the cable. 5. Plug the AC adapter into a convenient power outlet. 6. To switch power to the receiver on, press ON/OFF (2). To switch power to the receiver off, press ON/OFF (2) again. Your receiver can only receive the transmitter signal if a) the transmitter and receiver operate within the same frequency band; and b) the transmitter and receiver are set to the same frequency within this frequency band.

Refer to fig. 5.

3.5 Setting Frequencies

Seite 18

1. Check that the carrier frequency (frequencies) of the transmitter is (are) identical to the receiving frequencies of your SR 40 FLEXX. The carrier frequency (frequencies) of the transmitter and the receiving frequencies of the receiver are indicated in MHz on the respective frequency stickers and in the respective Manual Supplements. 2. HT 40 FLEXX and PT 40 FLEXX: Set the frequency selector on the transmitter and the frequency selector (8) on the receiver to the same positions (1 - 1, 2 - 2, or 3 - 3). HT 40 PRO, PT 40 PRO, Microtools: Switch power to the transmitter and receiver ON. If the RF MUTE LED (3b) on the receiver is lit, set the frequency selector (8) on the receiver to a position where RF MUTE (3b) goes out and the RF OK LED (3a) comes on. 1. Move the transmitter around the area where you will use the system to check the 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 repositioning the receiver. If this does not help, avoid the dead spots. 2. The RF OK LED (3a) on the receiver going out means no signal is being received or the squelch is active. Switch the transmitter on, move closer to the receiver, or set the squelch threshold to the point that the green RF OK LED (3a) will be lit. 3. If the received signal is noisy, set the squelch threshold to a level where the noise will stop.

Never set the squelch threshold any higher than absolutely necessary. The higher the squelch threshold (-70 dBm = max., -100 dBm = min.), the lower the sensitivity of the receiver and thus the usable range between transmitter and receiver. The spacing between the three frequencies of each WMS 40 FLEXX transmitter and receiver is wide enough for operating three radio channels simultaneously within the same frequency band with no mutual interference. For systems with up to nine channels you will need WMS 40 FLEXX kits in up to three different frequency bands. Please ask your dealer which frequency bands are suited for multichannel use and approved for the place where you will use the system. Perform steps 1 through 6 for each frequency band separately. 1. 2. 3. 4. 5. 6. Switch power to all transmitters and receivers off. Set the frequency selectors on the transmitter and receiver for channel 1 to "1". Set the frequency selectors on the transmitter and receiver for channel 2 to "2". Set the frequency selectors on the transmitter and receiver for channel 3 to "3". Set up the transmitter and receiver for channel 1. Repeat steps 1 through 5 for channels 2 and 3.
Do not operate two or more wireless channels on the same frequency at the same time and location. This would cause unwanted noise due to radio interference. Prior to changing a carrier frequency, be sure to switch the transmitter off. To activate the new carrier frequency, switch the transmitter back on.

Seite 19

4 Cleaning
Use a soft cloth moistened with water to clean the receiver surfaces.

5 Troubleshooting

Problem No sound. Possible Cause Remedy 1. AC adapter is not connected to re- 1. Connect AC adapter to receiver ceiver and/or power outlet. and/or power outlet. 2. Receiver is OFF. 2. Push ON/OFF switch to switch receiver ON. 3. Receiver is not connected to mixer 3. Connect receiver output to mixer or or amplifier. amplifier input. 4. VOLUME control on receiver is at 4. Turn up VOLUME control. zero. 5. Microphone or instrument is not 5. Connect microphone or instrument connected to bodypack transmitter. to audio input on bodypack. 6. Transmitter is tuned to different fre- 6. Tune transmitter and receiver to quency than receiver. same frequency / use transmitter with compatible frequency. 7. Transmitter on/off switch is at 7. Set transmitter on/off switch to "OFF" or "MUTE". "ON". 8. Transmitter battery(ies) is(are) not 8. Insert battery(ies) conforming to inserted properly. "+" and "-" marks. 9. Transmitter battery(ies) dead. 9. Replace battery(ies). 10. Transmitter is too far away from re- 10. Move closer to receiver or reduce ceiver or squelch threshold setting squelch threshold setting. is too high. 11. Obstructions between transmitter 11. Remove obstructions. and receiver. 12. Receiver is invisible from transmit- 12. Avoid spots where you cannot see ter location. receiver. 13. Receiver is too close to metal ob- 13. Move receiver away from or rejects. move interfering objects. 1. Antenna location. 2. Interference from other wireless systems, TV, radio, CB radios, or defective electrical appliances or installations. 1. Relocate receiver. 2. Switch off interference sources or defective appliances; switch transmitter and receiver to different frequency / use transmitter and receiver operating in a different frequency band; have electrical installation checked. 1. Handheld transmitter: Set GAIN to alternative position. Bodypack transmitter: Turn GAIN control down or up just enough to stop the distortion.