Grid PN90 Band Conditions — Japan
Localized HF conditions for Maidenhead locator PN90. Coordinating at 40.50°, 139.00°. Updated with real-time telemetry from NOAA and DX cluster reports.
PN90 conditions are FAIR. Best bands: 10m, 12m, 15m, 17m, 20m. SFI: 137.
From Japan operating area, work the 19:32 UTC and 10:10 UTC grayline windows: probe 20m, 30m, and 40m in the 15 minutes either side while the terminator crosses PN90.
10m is the first place to check for long-haul openings from this region, with 15m close behind.
This square sits in Japan footprint and is best used as a planning center for portable, field-day, and home-station band decisions.
- Latitude zone
- mid-latitude
- Local phase
- Daylight
- Aurora exposure
- low at this latitude
- Grayline
- 19:32 UTC / 10:10 UTC
- Best high band
- 10m
- Nearest city
- Japan operating area
● Local Band Quality Scorings
Use this local score for PN90, then compare the global live ranking oncurrent ham band conditionsbefore changing bands.
● Best DX Windows from PN90 — Japan operating area
Great-circle distance, short-path beam heading, the bands most likely open right now from PN90 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 |
|---|---|---|---|---|
| South Asia | 3,744 mi | 269° | 40m, 20m, 80m | Open now |
| Oceania | 4,922 mi | 170° | 10m, 15m, 20m | Open now |
| Europe | 5,462 mi | 329° | 40m, 20m, 80m | Open now |
| North America | 5,874 mi | 41° | 10m, 15m, 20m | Open now |
| Southern Africa | 8,532 mi | 263° | 40m, 20m, 80m | Open now |
| South America | 10,400 mi | 35° | 10m, 15m, 20m | Open now |
● Band-by-Time Plan for PN90
A planning heuristic for the local day at PN90, built from sunrise 19:32 UTC, sunset 10:10 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 PN90 and the adjacent squares
These are the newest 10m, 15m, and 20m reports where one side of the path sits in PN90, PN91, PM99, QN00, PN80. 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 PN90, start with 10m EXCELLENT, 15m EXCELLENT, 20m GOOD and keep 20m available as the safest all-around fallback.
Open contest calendarNearby grids