Audio-Technica ATW-251, H92 System Operation, Ten Tips To Obtain The Best Results, Receiver on

System Operation

Turn down the receiver volume control and the mixer/amplifier level before starting up the wireless system. Do not switch on the transmitter yet.

Receiver on...

Plug the power supply into an AC power source. The green Power indicator on the front panel will light.

Transmitter on...

When the transmitter is switched on, the receiver’s yellow RF signal indicator will light. The transmitters have a 3-position power switch. When the switch is set to “Standby” (ST or ST.BY), the transmitter produces RF with no audio signal. When the switch is “On,”the transmitter produces both RF and audio. Excessive audio input to the transmitter will cause the receiv- er’s red AF Peak indicator to light.

Receiver Volume

Under typical operating conditions, the receiver's volume control should be turned all the way up, with overall system audio gain adjusted at the mixer or amplifier.

Input Level Adjustment

Input trimmer controls in the transmitters enable you to maximize performance for a particular microphone or guitar sensitivity, or to adjust for different acoustic input levels.

Adjusting Input Level - UniPakTransmitter

Slide the battery cover off the top part of transmitter and remove the screwdriver from its clip (Fig. D). Gently turn both the “MT” (Mic Trimmer) and “GT” (Guitar Trimmer) controls to their full counterclockwise positions (toward “LO”).

• Microphone: Adjusting input level

Gently turn only the “MT” (Mic Trimmer) control all the way

up (clockwise, toward “Hi”). Check for excessive gain by speak- ing/singing into the microphone at typically loud levels while watching the receiver’s AF Peak indicator. If the AF Peak indica- tor does light, turn the MT control slightly counterclockwise until the AF Peak indicator no longer lights with maximum audio input to the transmitter.

• Guitar/Instrument: Adjusting input level

Gently turn only the “GT” (Guitar Trimmer) control all the way up (clockwise, toward “Hi”). Check for excessive gain by playing at typically loud levels while watching the receiver’s AF Peak indicator. If the AF Peak indicator does light, turn the GT control slightly counterclockwise until the AF Peak indicator no longer lights with maximum instrument input to the transmitter.

After adjusting input level, return the screwdriver to its clip and reinstall the battery cover. No further transmitter gain adjustments should be needed, as long as the input device and the acoustic input level are not changed.

Adjusting Input Level - Handheld Transmitter

Unscrew the lower body cover and slide it downward, exposing the screwdriver and Gain Trimmer control (Fig. G). Remove the screwdriver from its clip. Gently turn the control to its full clockwise position (toward the side marked “H”), the factory setting. Check for excessive gain by speaking/singing into the microphone at typically-loud levels while watching the receiver’s AF Peak indicator. If the AF Peak indicator does light, turn the Gain Trimmer control slightly counterclockwise until the AF Peak indicator no longer lights with maximum audio input to the mic/transmitter.

Return the screwdriver to its clip and close and secure the lower body. No further transmitter gain adjustments should be needed, as long as the acoustic input does not change significantly.

CAUTION! The small trimmer controls are delicate; use only the supplied screwdriver. Do not force the trimmers beyond their normal 190o range of rotation.

Return the screwdriver to its storage clip when not in use.

Ten Tips To Obtain The Best Results

1.	Use only fresh alkaline batteries. Do not use “general purpose”	8.	If the receiver output is set too low, the overall signal-to-noise ratio
	(carbon-zinc) batteries.		of the system may be reduced. Conversely, if the volume control
2.	Position the receiver so that it has the fewest possible		of the receiver is set too high, it may over-drive the input of the
			mixer/amplifier, causing distortion. Adjust the output level of the
	obstructions between it and the normal location of the transmitter.
			receiver so the highest sound pressure level going into the
	Line-of-sight is best.
			microphone (or the loudest instrument playing level) causes no
3.	The transmitter and the receiver should be as close together as
			input overload in the mixer, and yet permits the mixer level
	conveniently possible, but not less than 6' (2 m).		controls to operate in their “normal” range (not set too high or
4.	Do not place the receiver antennas within 3' (1 m) of another		too low). This provides the optimum signal-to-noise for the
	receiver or antenna.		entire system.
5.	The receiver antennas should be kept away from any metal.	9.	Turn the transmitter off when not in use. Remove the battery if
6.	A receiver cannot receive signals from two transmitters at the		the transmitter is not to be used for a period of time.
		10.	Unplug the receiver from the AC outlet when the system is not
	same time.
7.	In the UniPak transmitter, the “MT” or “GT” input control not		in use.

in use should be set to minimum.

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