What grid square is Japan operating area?

PM90 is the live DXRadar reference square for Japan operating area. The exact portable or home QTH may vary within the square, but this page tracks the center of PM90 for planning propagation.

How do I find my grid square?

Use a Maidenhead grid lookup from your GPS coordinates or street address, then compare that grid with the nearby squares linked on this page. A 4-character grid is enough for most HF planning.

What bands are open in PM90 right now?

PM90 is currently rated POOR. The best bands right now are 10m, 20m, 30m, 40m, 60m, with 10m as the main band to watch first.

Grid PM90 Band Conditions — Japan

Localized HF conditions for Maidenhead locator PM90. Coordinating at 30.50°, 139.00°. Updated with real-time telemetry from NOAA and DX cluster reports.

PM90 conditions are POOR. Best bands: 10m, 20m, 30m, 40m, 60m. SFI: 105.

Regional Radar

SFI

105

K-Index

1.33 Kp

Center Coords

30.5, 139.0

Local Phase

Daylight

Grayline window

Sunrise 20:33 UTC

Sunset 08:43 UTC from PM90

From Japan operating area, work the 20:33 UTC and 08:43 UTC grayline windows: probe 20m, 30m, and 40m in the 15 minutes either side while the terminator crosses PM90.

Best band now

10m

10m is the first place to check for long-haul openings from this region, with 15m close behind.

Closest operating hub

Japan operating area

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: 20:33 UTC / 08:43 UTC
Best high band: 10m
Nearest city: Japan operating area

● Local Band Quality Scorings

Use this local score for PM90, then compare the global live ranking oncurrent ham band conditionsbefore changing bands.

10m

EXCELLENT

15m

EXCELLENT

20m

GOOD

40m

POOR

80m

POOR

● Best DX Windows from PM90 — Japan operating area

Great-circle distance, short-path beam heading, the bands most likely open right now from PM90 to each DX region at SFI 105 / Kp 1.33, 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	3,781 mi	277°	10m, 15m, 20m	Open now
Oceania	4,242 mi	169°	10m, 15m, 20m	Open now
Europe	6,059 mi	330°	10m, 15m, 20m	Open now
North America	6,398 mi	41°	10m, 15m, 20m	Open now
Southern Africa	8,407 mi	256°	10m, 15m, 20m	Open now
South America	10,918 mi	49°	10m, 15m, 20m	Open now

● Band-by-Time Plan for PM90

A planning heuristic for the local day at PM90, built from sunrise 20:33 UTC, sunset 08:43 UTC, SFI 105, and Kp 1.33. Not a measurement — a starting point for where to listen as the day turns.

Dawn grayline

around 20:33 UTC

40m · 30m · 20m

Grayline enhancement — low bands reach long distances as the terminator passes.

Morning

after 20:33 UTC

20m · 15m

Modest SFI — 20m is the daytime workhorse here.

Midday

local noon

15m · 20m

20m and 15m carry the daytime load at this SFI.

Dusk grayline

around 08:43 UTC

20m · 40m

Second grayline peak — 20m holds, then hands off to 40m.

Night

after 08:43 UTC

40m · 80m

Low bands own the darkness — 40m for DX, 80m regional.

Recent local activity

Spots touching PM90 and the adjacent squares

These are the newest 10m, 15m, and 20m reports where one side of the path sits in PM90, PM91, PL99, QM00, PM80. This gives the page unique, local context instead of a generic solar snapshot.

No fresh PSKReporter paths are cached for the immediate PM90 footprint right now. That usually means you should widen the search to the nearest regional hubs below or fall back to 20m/40m for the next operating window.

Top DX targets

Where this grid is reaching right now

No outbound targets were strong enough to rank from the current cache. Check back after the next PSKReporter refresh or switch to the regional grids below.

Contest preview

Next major contest outlook

CQ World Wide DX Contest - SSB starts Sat, 24 Oct 2026 00:00:00 GMT. Current forecast from PM90: 10m EXCELLENT, 15m EXCELLENT, 20m GOOD. Current solar conditions (SFI 105, K 1.33) favor 10m, 15m, 20m for this contest weekend.

Open contest calendar

Nearby grids