Shure UA874WB Manual Del Usuario página 4

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 to a passive setting 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*
10' (3 m) 0
25' (8 m) +6*
50' (15 m) *
100' (30 m) *
* 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
4
RG8X RG213/ Low-loss
RG8 RG8/
RG213**
0 0 0
0 0 0
+6 +6 0
+12 +6 +6
Specifications
Connector Type
BNC, Female
Impedance 50 Ω
Power Requirements 10 to 15 V DC bias from coaxial connection,
75 mA
Reception Pattern 70 degrees
3 dB Beam Width
Third-order
>30 dBm
Overload Intercept
Point (OIP3)
Antenna Gain 7.5dBi
On Axis
Signal Gain
±1 dB
RF Overload LED −5 dBm
Threshold
RF overload LED does not operate for passive gain settings
Dimensions 316 mm x 359 mm x 36 mm (H x W x D)
Weight 317 g (11.2 oz.)
Operating -18°C (0°F) to 63°C (145°F)
Temperature Range
Storage
-29°C (-20°F) to 74°C (165°F)
Temperature Range
Certifications
Meets essential requirements of the following European Directives:
• R&TTE Directive 99/5/EC
• WEEE Directive 2002/96/EC, as amended by 2008/34/EC
• RoHS Directive 2002/95/EC, as amended by 2008/35/EC
Note: Please follow your regional recycling scheme for batteries and
electronic waste
Meets requirements of the following standards: EN60065, EN 301 489
Parts 1 and 9.
Switchable
Active: +12 dB
+6 dB
Passive: 0 dB
−6 dB