Shure UA874 User Manual download pdf (Page 4)

Antenna Placement

Use the following guidelines when mounting antennas:

• Antennas and receivers must be from the same band.

• Mount antennas at least four feet apart.

• Position antennas so there is nothing obstructing a line of sight to the

transmitter (including the audience).

• Keep antennas away from large metal objects.

Important: Always perform a "walk around" test to verify coverage before

using a wireless system during a speech or performance. Experiment

with antenna placement to find the optimum location. If necessary, mark

"trouble spots" and ask presenters or performers to avoid those areas.

Setting Gain

The gain setting should only be used to compensate for the calculated

cable signal loss. Additional signal gain does not mean better RF perfor-

mance. Too much gain actually reduces reception range and the number

of available channels. This is because Shure receivers are optimized to

deliver the best performance when the sum of signal gain and cable loss

equals 0 dB. Additional gain just amplifies everything in the RF range—in-

cluding interference and ambient RF noise. It cannot selectively increase

the signal from the transmitter.

• Use the lowest gain setting necessary to achieve good reception of the

transmitter RF signal, as indicated on the receiver’s RF LED or meter.

• Only increase the gain setting to compensate for the calculated cable

loss.

• The −6 dB gain setting can be useful for applications with short cable

runs (25 feet or less) and where the distance between the transmitter

and antenna is less than 100 feet.

• Reduce gain if the antenna RF Overload LED illuminates—the signal is

strong enough, so gain is not needed.

Recommend Gain Settings

Use the following chart as a guideline for setting gain based on cable type

where the distance from the antenna to the transmitter is greater than 100

feet.

NOTE: For installations where the antenna is less than 75 feet from the

transmitter, lower the gain setting one step.

Cable Length Gain Setting (based on cable type)

RG58* RG8X RG213/

RG8

Low-loss

RG8/

RG213**

10' (3 m) 0 0 0 0

25' (8 m) +6* 0 0 0

50' (15 m) * +6 +6 0

100' (30 m) * +12 +6 +6

* RG58 cable has high signal loss and is not recommended for cable

runs greater than 10 feet

** Low-loss RG8/RG213 cables include Times Microwave Systems

LMR400 and Belden 9913 or 7810A

Find More Information Online

For setup tips and more information on wireless accessories, visit http://

www.shure.com/WirelessAccessoryWizard

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Shure UA874 User Manual Page 4

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