Live Spectrum · UHF Band
470 MHz------
Signal Meters
CH A · 518.000 MHz
— dBm
CH B · 542.375 MHz
— dBm
--:--:----- MHzAwaiting scan...
Set Channel Frequencies
TV Interference Zones (US)
Avoid these frequency ranges — occupied by TV broadcast channels
BLX188/CVL Compatible Bands
Select your unit's band version:
Frequency Separation Rules
• Minimum spacing between channels: 300–500 kHz
• BLX188 uses 25 kHz channel steps
• For 8+ systems: use dedicated frequency coordination software
• Keep 1 MHz away from TV channel edges
• IM3 products: f1×2 − f2 and f2×2 − f1 must be outside band
• BLX188 uses 25 kHz channel steps
• For 8+ systems: use dedicated frequency coordination software
• Keep 1 MHz away from TV channel edges
• IM3 products: f1×2 − f2 and f2×2 − f1 must be outside band
Battle Rap Setup — Quick Config
For 2-person battle rap with BLX188 dual system:
🎤 BLX188/CVL Overview
Operates in UHF (470–900 MHz depending on band). Dual-channel receiver, two CVL lavalier mics. 300ft line-of-sight range. 14-hour battery life on AA.
⚠️ Pre-Show Scan Protocol
1. Arrive 45–60 min early before soundcheck
2. Power off all wireless units first
3. Run spectrum scan to find clean frequencies
4. Program both channels with 500 kHz+ separation
5. Test walk full stage area — check for dropouts
6. Mark working frequencies on setlist/cue sheet
2. Power off all wireless units first
3. Run spectrum scan to find clean frequencies
4. Program both channels with 500 kHz+ separation
5. Test walk full stage area — check for dropouts
6. Mark working frequencies on setlist/cue sheet
🎭 Live Theatre Tips
• Coordinate with house A/V team for existing frequencies
• Theatre buildings often have RF interference from dimmer packs (avoid 500–510 MHz near dimmers)
• Use diversity antennas — position in clear sightlines to stage
• IEM systems and wireless mics must not share same band
• Theatre buildings often have RF interference from dimmer packs (avoid 500–510 MHz near dimmers)
• Use diversity antennas — position in clear sightlines to stage
• IEM systems and wireless mics must not share same band
🥊 Battle Rap Tips
• Outdoor venues: scan fresh — no building interference but more TV signals
• Two-channel setup: assign CH A to MC 1, CH B to MC 2
• Keep receivers within 50 ft of performers when possible
• Backup frequencies: have 2 spare coords ready
• Crowd RF: dense crowds slightly raise noise floor
• Two-channel setup: assign CH A to MC 1, CH B to MC 2
• Keep receivers within 50 ft of performers when possible
• Backup frequencies: have 2 spare coords ready
• Crowd RF: dense crowds slightly raise noise floor
🚫 Common Mistakes
• Running two units on same or adjacent frequency
• Not scanning before show (interference changes hourly)
• Antennas behind metal surfaces or inside racks
• Mixing Band H and Band J units (incompatible freqs)
• Ignoring intermodulation — always check IM products
• Not scanning before show (interference changes hourly)
• Antennas behind metal surfaces or inside racks
• Mixing Band H and Band J units (incompatible freqs)
• Ignoring intermodulation — always check IM products
📡 Note on RF Scanning
Smartphones don't have built-in UHF RF hardware. For true spectrum analysis, pair this app with a dedicated scanner (Shure WWB6 software, RF Venue Spectrum Genius, or RTL-SDR dongle + app). This app handles coordination, frequency planning, and reference data.