The Shure BLX14RUK/SM31-K3E is the K3E band variant of the Shure BLX analogue UHF wireless system. The system ships with a BLX4R half-rack single-channel receiver, bodypack transmitter and a Shure SM31FH cardioid condenser fitness headset. It is intended for fitness instructors, presenters, theatre, houses of worship and education.
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
✓Half-rack 1U chassis with detachable front-panel antennas and rack ears
✓Balanced XLR and unbalanced 1/4-inch audio outputs on the receiver
✓BLX1 bodypack transmitter with TA4F (TQG) input connector
✓Up to 14 hours of runtime from two AA batteries
Specifications
| Brand | Shure |
| Model | BLX14RUK/SM31-K3E |
| 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 | BLX4R half-rack single-channel, front-mounted antennas |
| Receiver outputs | Balanced XLR and unbalanced 1/4-inch (6.35 mm) |
| Transmitter | BLX1 bodypack, TA4F (TQG) input |
| Microphone | Shure SM31FH cardioid condenser fitness headset |
| Transmitter battery | 2 x AA, up to 14 hours runtime |
