Grid JB42 Band Conditions
Localized HF conditions for Maidenhead locator JB42. Coordinating at -77.50°, 9.00°. Updated with real-time telemetry from NOAA and DX cluster reports.
JB42 conditions are FAIR. Best bands: 10m, 20m, 30m, 40m, 60m. SFI: 137.
From the JB42 operating area, work the no sunrise — polar night and no sunset — polar night grayline windows: probe 20m, 30m, and 40m in the 15 minutes either side while the terminator crosses JB42.
Night operation should keep 20m on watch and move to 40m as the path darkens.
This square sits in a mixed-region footprint and is best used as a planning center for portable, field-day, and home-station band decisions.
- Latitude zone
- high-latitude
- Local phase
- Darkness
- Aurora exposure
- watch during geomagnetic storms
- Grayline
- no sunrise — polar night / no sunset — polar night
- Best high band
- 10m
- Nearest city
- the JB42 operating area
● Local Band Quality Scorings
Use this local score for JB42, then compare the global live ranking oncurrent ham band conditionsbefore changing bands.
● Best DX Windows from JB42 — the JB42 operating area
Great-circle distance, short-path beam heading, the bands most likely open right now from JB42 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 |
|---|---|---|---|---|
| Southern Africa | 3,601 mi | 19° | 40m, 20m, 80m | Open now |
| Oceania | 4,835 mi | 145° | 40m, 20m, 80m | Open now |
| South America | 4,869 mi | 289° | 40m, 20m, 80m | Open now |
| South Asia | 7,399 mi | 65° | 40m, 20m, 80m | Open now |
| Europe | 8,810 mi | 1° | 40m, 20m, 80m | Open now |
| North America | 9,091 mi | 263° | 10m, 15m, 20m | Open now |
| East Asia / Japan | 9,201 mi | 120° | 40m, 20m, 80m | Open now |
● Band-by-Time Plan for JB42
A planning heuristic for the local day at JB42, built from sunrise no sunrise — polar night, sunset no sunset — polar night, 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 JB42 and the adjacent squares
These are the newest 10m, 15m, and 20m reports where one side of the path sits in JB42, JB43, JB41, JB52, JB32. 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 JB42, start with 10m POOR, 15m POOR, 20m FAIR and keep 20m available as the safest all-around fallback.
Open contest calendarNearby grids
Four adjacent squares for internal path checking
Regional hub links