Grid NL40 Band Conditions — Kolkata
Localized HF conditions for Maidenhead locator NL40. Coordinating at 20.50°, 89.00°. Updated with real-time telemetry from NOAA and DX cluster reports.
NL40 conditions are FAIR. Best bands: 10m, 12m, 15m, 17m, 20m. SFI: 137.
From Kolkata, work the 23:35 UTC and 12:47 UTC grayline windows: probe 20m, 30m, and 40m in the 15 minutes either side while the terminator crosses NL40.
Local evening usually favors 20m first, then 40m as absorption drops.
This square sits in South Asia footprint and is best used as a planning center for portable, field-day, and home-station band decisions.
- Latitude zone
- tropical
- Local phase
- Darkness
- Aurora exposure
- low at this latitude
- Grayline
- 23:35 UTC / 12:47 UTC
- Best high band
- 10m
- Nearest city
- Kolkata
● Local Band Quality Scorings
Use this local score for NL40, then compare the global live ranking oncurrent ham band conditionsbefore changing bands.
● Best DX Windows from NL40 — Kolkata
Great-circle distance, short-path beam heading, the bands most likely open right now from NL40 to each DX region at SFI 137 / Kp 3, and a current verdict. "Open now" means a suitable band is scoring well on that path; "Try ~HH:MM" points at the next far-end grayline. Band picks and status are a planning heuristic, not a measurement.
| Target | Distance | Beam | Bands to try | Status |
|---|---|---|---|---|
| East Asia / Japan | 3,132 mi | 59° | 40m, 20m, 80m | Open now |
| Europe | 4,662 mi | 317° | 40m, 20m, 80m | Open now |
| Southern Africa | 5,305 mi | 235° | 40m, 20m, 80m | Open now |
| Oceania | 5,348 mi | 129° | 40m, 20m, 80m | Open now |
| North America | 8,301 mi | 6° | 10m, 15m, 20m | Open now |
| South America | 10,236 mi | 274° | 40m, 20m, 80m | Open now |
● Band-by-Time Plan for NL40
A planning heuristic for the local day at NL40, built from sunrise 23:35 UTC, sunset 12:47 UTC, SFI 137, and Kp 3. Not a measurement — a starting point for where to listen as the day turns.
Grayline enhancement — low bands reach long distances as the terminator passes.
High bands rising with the sun; check 10m for DX.
Peak high-band window — 10m and 15m open widest.
Second grayline peak — 20m holds, then hands off to 40m.
Low bands own the darkness — 40m for DX, 80m regional.
Recent local activity
Spots touching NL40 and the adjacent squares
These are the newest 10m, 15m, and 20m reports where one side of the path sits in NL40, NL41, NK49, NL50, NL30. This gives the page unique, local context instead of a generic solar snapshot.
Top DX targets
Where this grid is reaching right now
Contest preview
Next major contest outlook
No contest event is currently loaded. For planning from NL40, start with 10m POOR, 15m POOR, 20m FAIR and keep 20m available as the safest all-around fallback.
Open contest calendarNearby grids