HT420 - Microphone AKG - Free user manual and instructions

USER MANUAL HT420 AKG

Three black AKG audio devices: PT 420, SR 420, and a wireless microphone (no visible text or symbols on the devices themselves)

WMS420

Please read the manual before using the equipment!

MODE D'EMPLOI 34

Instrumental Set Head-worn

Diagram of a wireless router with numbered components and labeled ports

Diagram of a device with numbered components, likely an electronic device or scanner, showing labeled parts 1 through 7.

Technical diagram of a device with numbered components, likely an electronic or mechanical assembly.

Illustration of a mechanical device with a yellow circular component and a cable, no text or symbols present.

1 Safety and the environment....19

Safety....19

Environment 19

2 Description....20

Introduction 20

Scope of delivery....20

Optional Accessories....20

Receiver SR420 21

HT420 handheld transmitter 23

PT420 pocket transmitter 24

3 Setting up 26

Positioning the receiver 26

Connecting Antennas 26

Connecting the receiver to a balanced input....26

Connecting the receiver to power....26

Inserting and testing batteries in the handheld/pocket transmitters....27

Setting the frequency on the receiver 27

Setting the frequency on the handheld/pocket transmitter....27

Setting up the handheld transmitter....27

Setting up the pocket transmitter 27

Before the soundcheck....28

4 Microphone technique....29

HT420 handheld transmitter 29

PT420 pocket transmitter 30

5 Cleaning....31

Surfaces....31

Internal windshield of handheld transmitter 31

6 Troubleshooting....32

7 Technical data ....33

Only for frequency bands designed for use in the USA:

FCC Statement

This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Parts 74 and 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 user's 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.

1 Safety and the environment

Safety

• Do not spill any liquids on the equipment.
• Do not place any containers containing liquid on the device or the power pack.
• The equipment must only be used in dry rooms.
• The equipment must only be opened, serviced, and repaired by authorised personnel. The equipment contains no user-serviceable parts.
• 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.
• Only 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.
• If any solid object or liquid should get into the equipment, shut down the system immediately. Disconnect the AC adapter from the power outlet at once and have the equipment checked by our customer service department.
• If the equipment is not going to be used for a long time, disconnect the AC adapter from the power outlet. Please note that if you turn the equipment off while leaving the AC adapter plugged in, it is not fully isolated from the power supply.
• Do not place the equipment near heat sources such as radiators, heating ducts, amplifiers, etc. and do not expose it to direct sunlight, excessive dust, moisture, rain, mechanical vibrations, or shock.
• 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.
• 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 products containing alcohol or solvents since these may damage the enamel and plastic parts.
• Only use the equipment for the applications described in this manual. AKG cannot accept any liability for damages resulting from improper handling or misuse.

Environment

• The power supply unit consumes a small amount of electricity even when the unit is switched off. To save energy, unplug the power supply unit from the socket if you are not going to be using the unit for some time.
• The packaging is recyclable. Dispose of the packaging in an appropriate recycling collection system.
• If you scrap the unit, separate the case, electronics and cables and dispose of all the components in accordance with the appropriate waste disposal regulations.

2 Description

Introduction

Thank you for your decision to buy an AKG product. Please read the user instructions carefully before using the unit and keep them in a safe place so that you can refer to them in the future at any time. We wish you a lot of fun and success!

Scope of delivery

The WMS420 is available in 4 sets with receiver SR420:

Vocal set Presenter set

1 handheld transmitter HT420
1 tripod adapter
1 battery size AA
1 receiver SR420
1 switch-mode power supply SMPS
2 BNC UHF antennas
1 warranty card
1 frequency table
1 supplement ("Manual Supplement")
1 supplement ("Safety")
1 Quick Start Guide

1 pocket transmitter PT420
1 battery size AA
1 Lavalier microphone C417 L with clip
1 wind screen W407
1 receiver SR420
1 switch-mode power supply SMPS
2 BNC UHF antennas
1 warranty card
1 frequency table
1 supplement ("Manual Supplement")
1 supplement ("Safety")
1 Quick Start Guide

Instrumental set Head-worn

1 pocket transmitter PT420
1 battery size AA
1 MKG L cable
1 receiver SR420
1 switch-mode power supply SMPS
2 BNC UHF antennas
1 warranty card
1 frequency table
1 supplement ("Manual Supplement")
1 supplement ("Safety")
1 Quick Start Guide

set

1 pocket transmitter PT420
1 battery size AA
1 headset microphone C555 L
1 replacement lip guard
1 wind screen W444
1 receiver SR420
1 switch-mode power supply SMPS
2 BNC UHF antennas
1 warranty card
1 frequency table
1 supplement ("Manual Supplement")
1 supplement ("Safety")
1 Quick Start Guide

Please ensure that the package contains all of the system components listed above. In the event that something is missing, please contact your AKG dealer.

Optional Accessories

Remote Antenna System

• SRA2 W – Passive directional antenna
  • SRA2 B/W – Active directional antenna
  • RA4000 W – Passive omnidirectional antenna
  • RA4000 B/W – Active omnidirectional antenna
• PS4000 W – Active antenna splitter
  • AB4000 – Antenna booster
  • MK PS – Antenna cable, 2 ft./65 cm
• MKA5 – Antenna cable, 16 ft./5 m
• MKA20 – Antenna cable, 66 ft./20 m
  • 0110E01890 – Front-mount antenna cable

Charger

• CU400 charger for PT420 and HT420

Turn the transmitter off prior to charging.

NOTE

Receiver SR420

The SR420 is a stationary receiver for all channels of the WMS420 system.

The SR420 operates in a switching bandwidth of up to 30 MHz in the UHF carrier frequency range from 530.025 MHz to 931.850 MHz and can be switched to up to eight different carrier frequencies.

Front panel

Diagram of a wireless router with numbered components and labeled ports

Figure 1: Front panel controls on SR420 receiver

1 ON/OFF: On/off button.
2 VOLUME: This rotary control allows continuous adjustment of the audio output level.
3 RF OK: This LED lights up to indicate that signal is being received. If no signal is received or the automatic squelch is on, the RF OK LED goes out and the audio output is muted.
4 Display: Shows the selected receiving channel.
5 CLIP: This LED lights up if the audio level is too high.
6 CHANNEL: This button allows you to select one of up to 8 different carrier frequencies within the receiver's carrier frequency range.

Back side

Diagram of a device with numbered components, likely an Ethernet or wireless router, showing signal ports and antenna connections.

Figure 2: Rear panel controls on SR420 receiver

1 ANTENNA A/B: BNC jacks for connection of the two supplied UHF antennas or remote antennas (optional).
2 Carrier frequency label: An adhesive label stating the carrier frequency band is affixed on the back of the receiver. The enclosed frequency chart provides further information about the available frequencies.
3 SQUELCH: The squelch function turns the receiver off if the received signal is too weak so that the associated static noise or inherent noise of the receiver are not audible when the transmitter is turned off. Set the SQUELCH control to minimum before turning the receiver on for the first time.
4 AUDIO OUT/BALANCED: Symmetric audio output on 3-pole XLR jack: You can connect the microphone input of a mixer to this output, for example.
5 AUDIO OUT/UNBALANCED: Asymmetric audio output on 6.3 mm mono jack bush. Here you can connect a guitar amplifier, for example.
6 Strain relief for the supply cable of the provided AC adaptor.
7 DC IN: Supply socket for connecting the supplied AC adapter.

NOTE

The SR420 can be supplied with electricity via the external power pack or when using the antenna splitter PS4000 W, via the antenna cables. The splitter provides electricity to all connected SR420 receivers.

HT420 handheld transmitter

The HT420 handheld transmitter operates within a switching bandwidth of up to 30 MHz in the 530.025 to 931.850 MHz UHF carrier frequency range and offers up to 8 selectable carrier frequencies. The transmitter uses an antenna integrated within the housing.

The capsule in the transmitter is the patented dynamic AKG D5 capsule with its hypercardioid directional characteristic. It provides low handling noise sensitivity, high gain before feedback and brilliant sound quality, as well as a built-in wind and pop filter to reduce wind and breath noise.

Control elements

1 Display: Shows the set transmission channel.
2 CHANNEL: With this button, you can adjust the transmitter to one of up to eight different carrier frequencies within the transmitter's carrier frequency band.
3 GAIN: Use this slider to set the audio input sensitivity of the transmitter in two steps: "HI" = high input sensitivity, "LOW" = low input sensitivity.

1 2 3 4 5

6 7 8

Figure 3: Controls on HT420 transmitter

The CHANNEL button and the GAIN slider are located beneath a rubber flap. Fold this down to use the functions.

4 Control LED: This LED indicates the operational availability of the transmitter.

LED is green: Battery is OK.

LED is red: As soon as the LED changes to red, the remaining battery power allows at most one more hour of operation. We recommend exchanging the batteries as soon as possible.

5 On/Off switch: This slider has three positions:

ON: The transmitter's power supply is turned on.

MUTE: The audio signal received from the microphone head is muted. The power supply and HF carrier frequency remain activated.

OFF: The transmitter's power supply is turned off.

If you use a rechargeable battery, the LED will change to red approximately 15 minutes before the battery goes flat.

6 Carrier frequency label: An adhesive label stating the carrier frequency band is affixed above the battery compartment. The enclosed frequency chart provides further information about the available frequencies.
7 Battery compartment cover: See Inserting and testing batteries in the handheld/pocket transmitters (Page 27)
8 Charging contacts: The recessed charging contacts allow you to charge a battery using the optional charger CU400 without having to remove the battery from the battery compartment.

Turn the transmitter off prior to charging.

PT420 pocket transmitter

You can use the PT420 pocket transmitter with both dynamic microphones and condenser microphones operating on a supply voltage of approx. 4 V. Naturally you may also connect an electric guitar, electric bass or keytar.

The PT420 operates within a switching bandwidth of up to 30 MHz in the 530.025 to 931.850 MHz UHF carrier frequency range and offers up to 8 selectable carrier frequencies.

Control elements

1 ON/OFF switch: This slider has three positions:

ON: The transmitter's power supply is turned on.

MUTE: The audio signal emitted by the microphone or instrument is muted. The power supply and HF carrier frequency remain activated.

OFF: The transmitter's power supply is turned off.

2 Audio input jack: 3-pole mini XLR jack with contacts for microphone and line level. The right contacts are automatically assigned thanks to the connector assignment of the recommended AKG microphones or the MKG L guitar cable.

3 Antenna: Integrated flexible antenna.

4 Display: Shows the set transmission channel.

5 Control LED: This LED indicates the operational availability of the transmitter.

LED is green: Battery is OK.

Technical diagram of a device with numbered components, likely an electronic or mechanical assembly.

Figure 4: Controls on PT420 transmitter

LED is red: As soon as the LED changes to red, the remaining battery power allows at most one more hour of operation. We recommend exchanging the batteries as soon as possible.

NOTE

If you use a rechargeable battery, the LED will change to red approximately 15 minutes before the battery goes flat.

6 Battery compartment cover with integrated screwdriver.

7 Inspection window: The inspection window allows you at all times to check whether a battery or a rechargeable battery is inserted in the battery compartment.

8 Belt clip: To attach the pocket transmitter to a belt.

9 Carrier frequency label: An adhesive label stating the carrier frequency band is affixed on the back of the transmitter. The enclosed frequency chart provides further information about the available frequencies.

10 CHANNEL: With this button, you can adjust the transmitter to one of up to eight different carrier frequencies within the transmitter's carrier frequency band.

11 GAIN: This control serves to adapt the sensitivity of the audio input to the level of the connected microphone or instrument.

12 Charging contacts: The recessed charging contacts allow you to charge a battery using the optional charger CU400 without having to remove the battery from the battery compartment.

NOTE

Turn the transmitter off prior to charging.

Microphones, guitar cables

You can connect the following AKG microphones to the audio input jacks of the PT420:

• CK77 WR, CK99 L, C417 L, C520 L, C555 L, C544 L, HC577 L
  • C516 ML, C518 ML, C519 ML, C411 L
• With the MKG L guitar cable available from AKG you can connect an electric guitar, an electric bass guitar or a keytar.

The MKG L guitar cable is contained in the Instrumental Set and can also be purchased separately.

3 Setting up

NOTE

• Before you turn on your WMS420, set the transmitter and the receiver to the same frequency. If transmitter and receiver are set to different frequencies, radio connection is not possible!
• Using the two output jacks (BALANCED and UNBALANCED) at the same time may lead to level drops and increased noise.

Positioning the receiver

• Set up the receiver as a free-standing unit.
• 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, set up the receiver as follows:

1) Place the receiver near the performance area (stage). Make sure, though, that the transmitter will never be 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 large metal objects, walls, scaffolding, ceilings, etc.

Connecting Antennas

The supplied 14 -wave antennas can be mounted quickly and easily and are suitable for applications where a direct line of sight between the transmitter and the receiver antenna is available and a wireless microphone system has to be set up within a very short time.

Remote Antennas

If reception is less than ideal at the receiver's position, use remote antennas:

• Connect the remote antennas to the BNC sockets on the receiver rear panel.
• Use RG58 or RG213 cable to connect the antennas.
• For details on antennas, accessories, and frequency planning support visit our website at www.akg.com.

Antenna Front-mount Cable

Use the BNC extension cable (AKG part #0110E01890) to mount the 14 -wave antennas on the front panel

Connecting the receiver to a balanced input

1) Use an XLR cable to connect the BALANCED output on the back of the receiver to a balanced microphone input (XLR socket) on the mixer or amplifier.
2) Turn the VOLUME control on the receiver fully anticlockwise to set the receiver output to mic level.

Connecting the receiver 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 wreck the unit.
2) Plug the feeder cable of the included power supply into the DC IN socket on the receiver.
3) Plug the AC adapter into a power outlet.
4) Press the ON/OFF switch to switch the receiver on.

Inserting and testing batteries in the handheld/pocket transmitters

1) Depress the snap hook on the battery compartment cover.
2) Pull the battery compartment cover off the transmitter in the direction shown by the arrow.
3) Insert the supplied battery into the battery compartment conforming to the polarity marks. The transmitter will not function if you insert the battery the wrong way round.
4) To turn the transmitter on, set the on/off switch to "ON".

If the battery is in good condition, the status LED will be lit green.

If the status LED is lit red, the battery will be flat within about one hour. Replace the battery with a new one as soon as possible.

If the status LED is not lit, the battery is flat. Insert a new battery.

NOTE

If you use a rechargeable battery, the LED will change to red approximately 15 minutes before the battery goes flat.

5) To close the battery compartment, slide the battery compartment cover onto the battery compartment from below until the snap hook engages.

Setting the frequency on the receiver

Set the transmitter and receiver to the same frequency:

Setting the frequency on the handheld/pocket transmitter

1) Set the desired channel number by pressing CHANNEL. With each press of the button, the channel number increases by one.
2) The set channel is indicated on the display and activated immediately.
1) Switch the receiver on or, if it is already on, press CHANNEL. The selected channel (e.g. 1) blinks for 3 seconds after which it is displayed without blinking, indicating that the selected channel is active.
2) During those 3 seconds, press CHANNEL to obtain the required channel number. Each press of the button increases the channel number by one.
3) Once you have reached the required channel number, the display blinks for a further 3 seconds after which the channel you have just selected becomes active.

Setting up the handheld transmitter

1) Set the SQUELCH control on the receiver to minimum and switch the receiver on.
2) To turn the handheld transmitter on, set the on/off switch to "ON".
3) Switch on your PA system or amplifier.
4) Set the transmitter and receiver to the same frequency.
5) Speak or sing into the microphone and watch the LEDs on the receiver:
- If the CLIP LED does not light up at all, the input sensitivity of the transmitter is too low. Set the GAIN to "HIGH".
- If the CLIP LED lights up frequently or all the time, the input sensitivity of the transmitter is too high. Set the GAIN to "LOW".
6) Set the volume of the PA system or amplifier referring to the appropriate instruction manual or by ear.

Setting up the pocket transmitter

The pocket transmitter PT420 is designed for use with AKG microphones.

If you would like to connect microphones from other manufacturers to the PT420, please note that you may have to replace the connector plug of your microphone with a 3 pole mini XLR plug.

Contact assignment of the audio input plug:

Contact 1: Shield

Contact 2: Audio inphase (+)

Contact 3: Supply voltage

A positive supply voltage (4 V) is provided on contact 3 for condenser microphones.

ATTENTION

AKG cannot guarantee that the PT420 pocket transmitter will work perfectly with products from other manufacturers and any damage that may result from such use is not covered by the AKG warranty scheme.

Connecting the microphone

1) Remove the battery compartment cover.
2) Connect the mini XLR plug on the cable of your microphone to the audio input jack of the pocket transmitter.
3) Turn the pocket transmitter on by setting the ON/OFF switch to "ON".
4) Set the SQUELCH control on the receiver to minimum and switch on the receiver.

3D illustration of a mechanical device with a yellow circular component and a cable, no text or symbols present

Figure 5: Adjusting the GAIN control

5) Set the frequency on the transmitter and on the receiver to the same frequency.
6) Speak or sing into the microphone.
7) Adjust the GAIN control with the screwdriver integrated in the battery compartment cover so that the CLIP-LED on the receiver lights up briefly at intervals.
8) Replace the battery compartment cover on the transmitter.

Connecting an instrument

1) Remove the battery compartment cover.
2) Plug the jack plug on the MKG L guitar cable into the output jack of your instrument and the mini XLR connector on the guitar cable into the audio input socket of the pocket transmitter.
3) Turn the pocket transmitter on by setting the on/off switch to "ON".
4) Set the SQUELCH control on the receiver to minimum and switch the receiver on.
5) Play your instrument.
6) Use the screwdriver integrated in the battery compartment cover to set the GAIN control to a position where the CLIP LED on the receiver will flash occasionally.
7) Replace the battery compartment cover on the transmitter.

Before the soundcheck

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) If the RF OK LED on the receiver goes out, this means no signal is being received or the squelch is active.
Switch the transmitter on, move closer to the receiver or adjust the squelch level to the point where the green RF OK LED lights up.
3) If interference noise occurs, adjust the squelch level until the interference noise goes away.

NOTE

Do not set the squelch level higher than necessary. The higher the squelch level, the lower the sensitivity of the receiver and hence the smaller the range between transmitter and receiver.

4 Microphone technique

HT420 handheld transmitter

A handheld vocal microphone provides many ways of shaping the sound of your voice as it is heard over the sound system.

The following sections contain useful hints on how to use your HT420 handheld transmitter for best results.

Working distance and proximity effect

Basically, your voice will sound bigger and mellower, the closer you hold the microphone to your lips. Moving away from the microphone will produce a more reverberant, more distant sound as the microphone will pick more of the room's reverberation.

You can use this effect to make your voice sound aggressive, neutral, sensual, etc. simply by altering your distance from the microphone.

The proximity effect is a powerful increase in low frequency response that occurs when a sound source is close to a microphone (less than 2 inches / 5 cm). It gives more "body" to your voice and an intimate, bass-heavy sound.

Angle of incidence

Sing to one side of the microphone or above and across the top of the microphone. This provides a well-balanced, natural sound.

If you sing directly into the microphone, it will not only pick up excessive breath noise but also overemphasise "s", "sh", "tch", "p", and "t" sounds.

Feedback

Feedback occurs when part of the sound projected by the loudspeakers is picked up by a microphone, amplified and fed back to the speakers. Above a certain volume (the feedback threshold) this process becomes a vicious circle, making the sound system howl and screech. The only solution is to turn down the volume.

To reduce the danger of this happening, the microphone of the HT420 has a cardioid pickup pattern.

This means that the microphone is most sensitive to sounds arriving from in front of it (your voice), while picking up hardly any sound arriving from the sides or rear (from monitor speakers for instance).

To maximize gain before feedback, place the PA speakers in front of the microphones (along the front edge of the stage).

If you use monitor speakers, be sure never to point any microphone directly at the monitors or at the PA speakers.

Feedback may also be triggered by resonances (due to the room acoustics), particularly in the low frequency range, and thus indirectly by the proximity effect. In this case, it is often enough to move away from the microphone a little to stop the feedback.

Backing vocals

1) Never let more than two people share a microphone.
2) Backing vocalists should not sing at more than 35^ to the microphone axis.

The microphone is very insensitive to sounds arriving from the side. If the two vocalists were to try and sing into the microphone at an angle of more than 35^ to the microphone axis, you would have to turn up the level of the microphone channel high enough to cause a feedback problem.

PT420 pocket transmitter

C417 L lavalier microphone

Fix the microphone to the supplied lavalier clip or to the optional H41/1 tiepin.

NOTE

1) Clip the microphone onto the speaker's clothing, as close as possible to his or her mouth. The closer the microphone is to the speaker's mouth, the less danger there is of feedback.

2) Make sure to aim the microphone towards the user's mouth.

C555 L headset microphone

Putting on the microphone

1) Put the microphone on.
2) Bend the gooseneck so that the microphone sits to one side in front of the corner of your mouth.

NOTE

• If you hear excessive pop noise ("p" and "t" sounds are overemphasised unnaturally), move the microphone capsule further away from your mouth (back or down).
• If the microphone sounds "thin" or flat, move the microphone capsule closer to your mouth.
  • Find the optimum position during the soundcheck.

Windshield

If (for instance, on an open-air stage) excessive wind or pop noise becomes audible, attach the supplied foam windshield to the microphone.

1) Slide the windshield onto the microphone capsule.
2) Pull the windshield over the outer end of the microphone capsule.

Moisture shield

A special moisture shield on the microphone capsule makes it harder for moisture and makeup to penetrate into the microphone.

This prevents the microphone apertures from being clogged by perspiration or makeup, which would make the sound dull and reduce the sensitivity of the microphone. Therefore, you should never remove the moisture shield from the microphone.

The C555 L headset microphone includes a replacement moisture shield in case the first one gets damaged or lost.

5 Cleaning

Surfaces

Internal windshield of handheld transmitter

- Use a soft cloth moistened with water to clean the surfaces.

1) Unscrew and remove the wire-mesh cap of the handheld transmitter.
2) Take the windshield (foam insert) out of the wire-mesh cap.
3) Wash the windshield in mild soap suds.
4) As soon as the windshield has dried, replace it in the wire-mesh cap and screw the wire-mesh cap onto the handheld transmitter.

6 Troubleshooting

Problem Possible cause	Remedy
No sound	AC adapter is not connected to receiver and/or power outlet.	Connect AC adapter to receiver and/or power outlet.
	Receiver is OFF.	Push ON/OFF switch to switch receiver ON.
	Receiver is not connected to mixer or amplifier.	Connect receiver output to mixer or amplifier input.
	VOLUME control on receiver is at zero.	Turn up VOLUME control.
	Microphone or instrument is not connected to pocket transmitter.	Connect microphone or instrument to audio input on the pocket transmitter.
	Transmitter has a different frequency range or is tuned to a different frequency from the receiver.	Use a transmitter with the same frequency range as the receiver or tune both to the same frequency.
	Transmitter on/off switch is at "OFF" or "MUTE".	Set transmitter on/off switch to "ON".
	Transmitter batteries are not inserted properly.	Insert batteries conforming to "+" and "-" marks.
	Transmitter batteries are flat.	Replace transmitter batteries.
	Transmitter is too far away from receiver or squelch level set too high.	Move closer to receiver or reduce squelch level.
	Obstructions between transmitter and receiver.	Remove obstructions.
	No line of sight between transmitter and receiver.	Avoid spots where you cannot see receiver.
	Receiver is too close to metal objects.	Remove interfering objects or move receiver away from them.
Noise, crackling, unwanted signals	Antenna position.	Move receiver to a different location.
	Interference from other wireless systems, TV, radio, walkie-talkies, or defective electrical appliances or installations.	Switch off interference sources or defective appliances or use a WMS420 tuned to a different frequency; have electrical installation checked.
Distortion	GAIN control is set too high or too low.	Turn GAIN control up or down until distortion goes away.
	Interference from other wireless systems, TV, radio, walkie-talkies, or defective electrical appliances or installations.	Switch off interference sources or defective appliances or use a WMS420 tuned to a different frequency; have electrical installation checked.
	Antenna position.	Move receiver to a different location. If dead spots persist, mark and avoid them.

7 Technical data

	HT420 PT420 SR420
Carrier frequencies 530.025 - 931.850 MHz		530.025 - 931.850 MHz	530.025 - 931.850 MHz
Switching band width up to 30 MHz* 30 MHz*			30 MHz*
Modulation	FM	FM	FM
Audio transmission bandwidth 70 - 20,000 Hz 40 -		20,000 Hz	40 - 20,000 Hz
Total harmonic distortion at 1 kHz typ. 0.8% typ. 0.8%			typ. 0.8%
Signal/S/N ratio typ. 105 dB(A) typ. 105 dB(A)			typ. 105 dB(A)
Transmission power 10 mW, 20 mW*		10 mW, 50 mW*	-
Voltage supply 1x 1.5 V battery size AA		1x 1.5 V battery size AA	Power supply unit 12 V / 500 mA (or via antenna splitter)
Operating time 6 - 8 h** 6 -		8 h**	-
Squelch threshold -	-		-100 to -70 dBm, adjustable
Audio output	-	-	XLR symmetric and 6.3 mm jack plug asymmetric: Adjustable from microphone to line level. Output level at rated travel: 500 mV eff.
Dimensions	235 x 50 x 50 mm	60 x 74 x 30 mm	200 x 150 x 45 mm***
Net weight	221 g	60 g	373 g

*Depends on the used frequency band
**Depends on RF power used
***Without antennas

Only for frequency bands designed for use in the EC:

This product corresponds to the standards stated in the Declaration of Conformity. You can download the Declaration of Conformity at www.akg.com or request it by e-mail from [e-mail].

Sommaire

1 bonnette anti-vent W407

1 récepteur SR420

Instrumental Set Head-worn

Diagram of a wireless router with numbered components and labeled ports

Technical diagram of a device with numbered components, likely an electronic or mechanical assembly.

Raccorder le microphone

3D diagram of a mechanical device with a yellow circular component and orange ports, no visible text or symbols

Micro-cravate C417 L

Instrumental Set Head-worn

Diagram of a wireless router with labeled components including ports 1 through 6 and a green indicator light.

Technical diagram of a device with numbered components, likely an electronic or mechanical assembly.

3D illustration of a mechanical device with a yellow circular component and orange ports (no text or symbols)

Receptor SR420....69

Transmisor manual HT420 71

Transmisor de bolsillo PT420....72

Instrumental Set Head-worn

Diagram of a wireless router with numbered components and labeled ports

Figura 1: Controles en el panel frontal del receptor SR420

Technical diagram of a device with numbered components, likely an electronic or mechanical assembly.

Figura 4: Controles del transmisor PT420

3D diagram of a mechanical device with a yellow circular component and orange ports, no visible text or symbols

Figura 5: Ajuste del regulador GAIN

Conectar as antenas ....90

Diagram of a wireless router with numbered components and labeled ports

Figura 1: Dispositivos de controlo no painel frontal do receptor SR420

Labeled diagram of a device showing numbered components from 1 to 7

Technical diagram of a device with numbered components, showing top and side views with labeled parts.

3D diagram of a mechanical device with a yellow circular component and orange ports, no visible text or symbols

Figura 5: Ajustar o regulador GAIN

Ligar o instrumento

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ROHS OK

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