What is a DX Cluster?
The DX Cluster is a real-time network where ham radio operators report ("spot") stations they hear or work on the air. When someone hears a rare station from, say, Bouvet Island on 20 meters, they post a spot to the cluster. Within seconds, thousands of operators worldwide see it and can tune to that frequency.
Think of it as a live feed of "who's on the air right now" — reported by humans, not automated systems. (Automated spots come from the Reverse Beacon Network, which uses software-based CW and digital mode decoders.)
How to Read a DX Spot
DX de W3LPL: 14195.0 5A1A strong signal up 5 2345Z
DX de W3LPL — W3LPL is the spotter (the person who heard the station)
14195.0 — Frequency in kHz (14.195 MHz = 20 meter SSB)
5A1A — The DX station (Libya — a rare DXCC entity)
strong signal up 5 — Comment (listening 5 kHz up)
2345Z — Time in UTC (23:45 UTC)
Understanding the Band Plan
Each HF band is divided into sub-bands for different modes. When you see a frequency, you can tell the mode:
| Band | CW | Digital / FT8 | SSB |
|---|---|---|---|
| 20m | 14.000-14.070 | 14.070-14.099 (FT8: 14.074) | 14.150-14.350 |
| 40m | 7.000-7.040 | 7.040-7.075 (FT8: 7.074) | 7.075-7.300 |
| 15m | 21.000-21.070 | 21.070-21.099 (FT8: 21.074) | 21.200-21.450 |
| 10m | 28.000-28.070 | 28.070-28.189 (FT8: 28.074) | 28.300-29.700 |
Our DX Cluster page shows band plan labels automatically next to each frequency.
DX Cluster vs RBN
DX Cluster
- - Human-reported spots
- - All modes (SSB, CW, Digital)
- - Includes comments ("up 5", "QSL via LoTW")
- - Lower volume, higher signal-to-noise
- - View live DX spots
Reverse Beacon Network
- - Automated skimmer spots
- - CW and digital modes only
- - Includes SNR and WPM data
- - Very high volume, great for band analysis
- - Explore your RBN reach
Tips for Using the DX Cluster
- 1. Filter by band. If you only have a 20m antenna, filter for 20m spots. No point seeing spots you can't work.
- 2. Act fast. Rare DX gets pileups within minutes. If you see a new DXCC entity spotted, tune there immediately.
- 3. Read the comments. "Up 5" means the DX station is listening 5 kHz above their transmit frequency (split operation). "QSL via LoTW" tells you how to confirm the contact.
- 4. Check QRZ. Click any callsign on our DX Cluster page to see the operator's QRZ profile — their location, equipment, and QSL info.
- 5. Cross-reference with propagation. Check the band conditions before chasing a spot. If the band is "Poor" to that region, you'll struggle.