Audio-Technica uhf wireless systems Adjusting Input Level Handheld Transmitter, RF Interference

System Operation (Continued)

Adjusting Input Level - Handheld Transmitter

Unscrew the lower body cover and slide it downward, exposing the screwdriver and Trim control (Figure G and H). Remove the screwdriver and gently turn the Trim control marked "VR" (vari- able resistor) to its full counterclockwise position.

While speaking/singing into the microphone at typically loud levels, carefully turn the VR control clockwise while watching the receiver’s AF Level indicator. Increase the VR con- trol setting until the maximum audio output of the mic lights three or four units on the receiver's AF Level indicator. Do not set the level too high. At normal audio levels, only the first two or three units should light.

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.

RF Power Adjustment

ATW-T161 RF power may be set to RF "Hi” (20 mW nominal) or RF "Lo” (10 mW nominal) via battery save switch (Figure E). The default setting is RF "Lo”. While the RF "Hi” setting normal- ly provides maximum operating range, the RF "Lo” setting will help extend battery life. The RF "Lo” setting may also be pre- ferred in multi-channel systems, or when operating very close to the receiver, to reduce the possibility of interference or overload.

Special Note: If accessing de-regulated frequencies between 863 to 865MHz(Ch. C to F), ATW-T161 must be set to RF Low.

RF Interference

Please note that wireless frequencies are shared with other radio services. According to the National Communication Authority, “Wireless microphone operations are unprotected from interference from other licensed operations in the band. If any interference is received by any Government or non- Government operation, the wireless microphone must cease operation...”

If you need assistance with operation or frequency selection, please contact your dealer.

Extensive wireless information is also available on the Audio-Technica US Web site at www.audio-technica.com

	Ten Tips to Obtain the Best Results
1.	Use only fresh alkaline batteries. Do not use “general	6.	The receiver and transmitter must be set to the same
	purpose” (carbon-zinc) batteries.		frequency.
2.	Position the receiver so that it has the fewest possible	7.	A receiver cannot receive signals from two transmitters
	obstructions between it and the normal location of the		at the same time.
	transmitter. Line-of-sight is best.	8.	Do not obstruct the handheld transmitter’s antenna
3.	The transmitter and the receiver should be as close		(located at the base) or attached body-pack transmitter’s
	together as conveniently possible, but no closer than		antenna with your hands.
	three feet (1 m).	9.	You need to change frequencies 1) when a strong
4.	Avoid placing the receiver in a low or shielded location		interference signal is received, 2) when audio quality is
	where the transmitter and receiver antennas are not		poor due to weak RF, or 3) during multiple-system
	visible to each other. If necessary, use remotely-located		operation in order to select an interference-free
	receiver antennas.		frequency.
5.	Avoid placing the receiver near computers or other RF	10.	Turn the transmitter off when not in use. Remove the
	generating equipment.		batteries if the transmitter is not to be used for a period
			of time.

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