The Shure BLX4UK is the K3E band variant of the Shure BLX analogue UHF wireless system. The system ships with a BLX4 tabletop single-channel receiver, . It is intended for professional live and installed audio use.
Licensing
In the UK, 606 to 613.5 MHz falls under Ofcom’s Channel 38 shared licence; frequencies above 613.5 MHz within the K3E tuning range require a site-specific coordinated PMSE licence from Ofcom. Operators must hold the appropriate licence before use.
Key Features
✓Operates in the K3E (606 to 630 MHz) UHF band
✓Analogue FM transmission at 10 mW RF output
✓Up to 91 m (300 ft) line-of-sight working range
✓QuickScan frequency selection finds a clear channel automatically
✓Microprocessor-controlled internal antenna diversity
✓Audio frequency response 50 Hz to 15 kHz
✓Dynamic range 100 dB A-weighted (typical)
✓Total harmonic distortion 0.5 percent typical
✓Compact tabletop chassis with internal antennas
✓Balanced XLR and unbalanced 1/4-inch audio outputs on the receiver
Specifications
| Brand | Shure |
| Model | BLX4UK |
| System family | BLX Wireless |
| Band | K3E (606 to 630 MHz) |
| Transmission | Analogue FM |
| RF output power | 10 mW |
| Audio frequency response | 50 Hz to 15 kHz |
| Dynamic range | 100 dB (A-weighted, typical) |
| Total harmonic distortion | 0.5 percent typical |
| Working range | 91 m (300 ft) line of sight |
| Receiver | BLX4 tabletop single-channel, internal antennas |
| Receiver outputs | Balanced XLR and unbalanced 1/4-inch (6.35 mm) |
