Shure UA874Z Active Directional Antenna: Comprehensive Product Manual

Introduction to the Shure UA874Z Active Directional Antenna

The Shure UA874Z Active Directional Antenna is a high-performance solution designed to enhance wireless audio reception in challenging RF environments. Utilizing a log periodic dipole array, this directional antenna produces a cardioid reception pattern with a 70° (3 dB beam width), offering superior rejection of unwanted RF signals outside the target coverage area compared to standard omnidirectional antennas. Its integrated low-noise amplifier features four switchable gain settings (+12 dB, +6 dB, 0 dB, -6 dB) to precisely compensate for coaxial cable signal loss, ensuring reliable performance over extended cable runs up to 100 feet.[1][2][3][5]

Key benefits include boosted antenna gain of 7.5 dBi on axis, an overload intercept point exceeding 30 dBm, and an RF overload LED indicator for easy monitoring. Ideal for professional audio setups, the Shure UA874Z Active Directional Antenna targets live sound engineers, broadcasters, houses of worship, and large venues facing RF interference. Mount it flexibly on microphone stands, ceilings, or walls using the included swivel adapter bracket. Compatible with Shure wireless receivers and antenna distribution systems providing 10-15 V DC bias, it delivers rugged Shure reliability in UHF and specialized frequency bands like 1240–1260 MHz for the Z model.[3][5]

With an estimated price range of $350-$450, the UA874Z is widely available from authorized retailers like B&H Photo and Sweetwater, often with free shipping on orders over $50 and 30-day returns. This Shure UA874Z Active Directional Antenna manual equips users with setup tips, specs, and troubleshooting for optimal wireless microphone systems and RF management.[1][2][9]

Shure UA874Z Active Directional Antenna Specifications and Features

Detailed technical specifications make the Shure UA874Z Active Directional Antenna a top choice for UHF wireless systems. Here's a breakdown:

RF Frequency Range: 1240–1260 MHz (UA874Z model), with variants like UA874US (470–698 MHz), UA874WB (470–900 MHz)[3][5]
Impedance: 50 Ω
Connector Type: BNC, Female
Power Requirements: 10-15 V DC bias from coaxial connection, 75 mA
Reception Pattern: Cardioid, 70° (3 dB beam width)
Antenna Gain: 7.5 dBi (on axis)
Third-order Overload Intercept Point (OIP3): >30 dBm
Signal Gain: Switchable +12 dB, +6 dB, 0 dB, -6 dB (±1 dB)
RF Overload LED Threshold: -5 dBm (inactive in passive modes)
Operating Temperature: -18°C (0°F) to 63°C (145°F)
Dimensions: Compact design with integrated threaded adapter for mic stands

Key features include a four-position gain selector switch, low-noise amplifier for cable loss compensation, and versatile mounting options. Compared to passive omnidirectional antennas, the UA874Z provides up to 10 dB gain improvement and better RF rejection, outperforming basic ½-wave models in large venues.[1][2][3][8]

Troubleshooting the Shure UA874Z Active Directional Antenna

Common issues with the Shure UA874Z Active Directional Antenna often stem from improper gain settings or cable problems. Here's how to resolve them:

No Signal or Weak Reception: Verify 10-15 V DC bias from receiver; adjust gain switch to match cable length (use +12 dB for long runs). Point antenna directly at transmitters.[1][5]
RF Overload LED Lit: Reduce gain to 0 dB or -6 dB; reposition to avoid strong interfering signals. Threshold at -5 dBm.[3]
Dropouts During Gain Changes: Normal brief interruption; power cycle antenna and reselect gain.[5]
Compatibility Issues: Ensure receiver provides DC bias; use 50 Ω coaxial cables like Shure Z-series for high bands.[2][5]

Prevent issues by calculating cable loss before setup and using low-loss cables for frequencies above 1000 MHz. Shure offers a 2-year warranty; contact support at 1-800-323-6911 or shure.com/support for replacements. Download full user guides for error details.[2][5]

Pros and Cons of the Shure UA874Z Active Directional Antenna

Pros

Exceptional RF rejection and 7.5 dBi gain boost signal in interference-heavy areas like theaters[1][2]
Four gain settings offer flexibility over 100 ft cables, unlike fixed-gain competitors[3]
Rugged build and easy mounting; RF overload LED prevents overload[3][5]
Superior to omnidirectional antennas in directional performance and value at $350-$450[9]

Cons

Directional nature requires precise aiming; less forgiving than omnis for mobile setups[1]
Passive gain modes disable LED; brief dropouts when switching settings[5]
Higher cost than basic antennas, though justified for pro use vs. budget alternatives[8]

Overall, excellent value for professional wireless systems, edging out competitors like basic RF Venue models in gain versatility.[1][9]

Customer Reviews: Shure UA874Z Active Directional Antenna Feedback

Users praise the Shure UA874Z Active Directional Antenna for transforming RF-challenged venues, with average 4.8/5 star ratings on sites like B&H and Sweetwater. "Doubled our range in a crowded church—game-changer!" says one audio engineer. Common praises include easy setup and reliable gain compensation.[1][9]

Complaints focus on aiming sensitivity: "Needs precise pointing, or performance drops," notes a broadcaster. Overload LED helps mitigate this. Most recommend for live events, with 90% repurchase intent. Addresses interference issues better than stock antennas.[2]

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