Grid PM78 Band Conditions — Japan
Localized HF conditions for Maidenhead locator PM78. Coordinating at 38.50°, 135.00°. Updated with real-time telemetry from NOAA and DX cluster reports.
PM78 conditions are FAIR. Best bands: 10m, 12m, 15m, 17m, 20m. SFI: 137.
From Japan operating area, work the 19:54 UTC and 10:21 UTC grayline windows: probe 20m, 30m, and 40m in the 15 minutes either side while the terminator crosses PM78.
Local evening usually favors 20m first, then 40m as absorption drops.
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
- Darkness
- Aurora exposure
- low at this latitude
- Grayline
- 19:54 UTC / 10:21 UTC
- Best high band
- 10m
- Nearest city
- Japan operating area
● Local Band Quality Scorings
Use this local score for PM78, then compare the global live ranking oncurrent ham band conditionsbefore changing bands.
● Best DX Windows from PM78 — Japan operating area
Great-circle distance, short-path beam heading, the bands most likely open right now from PM78 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 | 3,528 mi | 268° | 40m, 20m, 80m | Open now |
| Oceania | 4,831 mi | 166° | 40m, 20m, 80m | Open now |
| Europe | 5,468 mi | 328° | 40m, 20m, 80m | Open now |
| North America | 6,117 mi | 38° | 10m, 15m, 20m | Open now |
| Southern Africa | 8,300 mi | 259° | 40m, 20m, 80m | Open now |
| South America | 10,631 mi | 30° | 10m, 15m, 20m | Open now |
● Band-by-Time Plan for PM78
A planning heuristic for the local day at PM78, built from sunrise 19:54 UTC, sunset 10:21 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 PM78 and the adjacent squares
These are the newest 10m, 15m, and 20m reports where one side of the path sits in PM78, PM79, PM77, PM88, PM68. 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
Worked All Europe - SSB starts Sat, 12 Sep 2026 00:00:00 GMT. Current forecast from PM78: 10m POOR, 15m POOR, 20m FAIR. Current solar conditions (SFI 137, K 3) favor 10m, 15m, 20m for this contest weekend.
Open contest calendarNearby grids