Shure UA874us Amplified Directional Antenna VHF 470-698 MHz
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Information
Information
Manufacturer Information
Shure
https://www.shure.com
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Safety manager:
Algam SAS
Email: contact@algam.net
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An Active Antenna Designed to Ensure Reliable HF Reception in Demanding Environments
This wideband antenna follows the logic of professional HF systems: improving reception stability, optimizing the signal-to-noise ratio, and facilitating antenna placement, especially when receivers are rack-mounted or located away from the performance area. Its log-periodic format allows focusing reception towards the stage, a useful advantage whenever the environment is busy (multiple transmitters, interference, reflections).
Who Is It For and What Are Its Uses?
It is intended for users of HF systems (voice, instruments, conferences, theater, live performances) who want to gain range and consistency, or simply better control coverage. It is particularly relevant in Diversity setups with two antennas, to secure reception during movement and reduce dropouts.
Settings and Indicators: Simple Control, Immediate Results
4-Position Gain Selector
The external gain selector allows precise adjustment of the level sent to the receiver: to compensate for loss due to a long coaxial cable, or conversely reduce gain if the RF level is already high. This adjustment helps maintain a clean RF chain without over-amplification.
RF Saturation LED
The saturation LED serves as a field reference: if the RF input is too strong (threshold -5 dBm), you can adjust the gain or reconsider positioning to avoid saturation and its effects (loss of margin, instability, performance degradation).
Power Supply via Coaxial Cable Depending on Receivers
The BLX4RE, SLX4E, SLXD4E, SLXD4DE, and QLXD4E receivers require a UABIAST-E adapter to power each antenna via the coaxial cable (plan for two adapters for Diversity reception).
Technical specifications
| Category | receiver accessory | Weight | 317 g |
| Type | Active antenna | Dimensions (mm) | 316 x 359 x 36 (H x L x P) |
| Connections | BNC | ||
| Connector | BNC | Amplifier Gain | -6 dB, 0 dB, +6 dB, or +12 dB |
| RF Bandwidth | 470 to 698 MHz | Horizontal Directivity | 70deg |
| Antenna Gain | 7.5 dBi | Saturation LED | detection threshold at -5 dBm |
Questions frequently asked
Is the Shure UA874US antenna compatible with RF reception between 470 and 698 MHz?
This active antenna covers the RF band from 470 to 698 MHz. Its BNC connector allows connection to a compatible receiver system.
Are two directional antennas required for a Diversity receiver?
A Diversity setup requires two antennas to ensure reliable reception during movement. Two UA874US antennas can thus be used to cover both antenna inputs of the receiver.
How is the gain of the active antenna adjusted?
The external switch offers four positions: -6 dB, 0 dB, +6 dB, and +12 dB. The gain can compensate for losses in a long coaxial cable or be reduced when the RF level is high. The LED lights up if saturation is detected at -5 dBm.
Which adapter is needed to power this antenna with an SLXD or QLXD receiver?
The BLX4RE, SLX4E, SLXD4E, SLXD4DE, and QLXD4E receivers require a UABIAST-E adapter to power each antenna via the coaxial cable. Two adapters should be planned in a Diversity installation.
What is the directivity of the UA874US antenna?
Its log-periodic pattern presents a horizontal directivity of 70° and an antenna gain of 7.5 dBi, allowing orientation of reception towards the performance area.
