What grid square is San Francisco?

CM77 is the live DXRadar reference square for San Francisco. The exact portable or home QTH may vary within the square, but this page tracks the center of CM77 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 CM77 right now?

CM77 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 CM77 Band Conditions — San Francisco

Localized HF conditions for Maidenhead locator CM77. Coordinating at 37.50°, -125.00°. Updated with real-time telemetry from NOAA and DX cluster reports.

CM77 conditions are POOR. Best bands: 10m, 20m, 30m, 40m, 60m. SFI: 104.

Regional Radar

SFI

104

K-Index

0 Kp

Center Coords

37.5, -125.0

Local Phase

Daylight

Grayline window

Sunrise 14:08 UTC

Sunset 02:20 UTC from CM77

From San Francisco, work the 14:08 UTC and 02:20 UTC grayline windows: probe 20m, 30m, and 40m in the 15 minutes either side while the terminator crosses CM77.

Best band now

10m

10m and 20m are the main daytime rate bands from this part of North America. Watch 10m first if SFI stays elevated.

Closest operating hub

San Francisco

This square sits in USA 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: 14:08 UTC / 02:20 UTC
Best high band: 10m
Nearest city: San Francisco

● Local Band Quality Scorings

Use this local score for CM77, 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 CM77 — San Francisco

Great-circle distance, short-path beam heading, the bands most likely open right now from CM77 to each DX region at SFI 104 / Kp 0, 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
North America	1,463 mi	78°	10m, 15m, 20m	Open now
East Asia / Japan	5,097 mi	303°	10m, 15m, 20m	Open now
South America	5,655 mi	116°	10m, 15m, 20m	Open now
Europe	5,799 mi	27°	40m, 20m, 80m	Open now
Oceania	7,196 mi	243°	10m, 15m, 20m	Open now
South Asia	8,062 mi	336°	10m, 15m, 20m	Open now
Southern Africa	10,567 mi	73°	40m, 20m, 80m	Open now

● Band-by-Time Plan for CM77

A planning heuristic for the local day at CM77, built from sunrise 14:08 UTC, sunset 02:20 UTC, SFI 104, and Kp 0. Not a measurement — a starting point for where to listen as the day turns.

Dawn grayline

around 14:08 UTC

40m · 30m · 20m

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

Morning

after 14:08 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 02:20 UTC

20m · 40m

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

Night

after 02:20 UTC

40m · 80m

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

Recent local activity

Spots touching CM77 and the adjacent squares

These are the newest 10m, 15m, and 20m reports where one side of the path sits in CM77, CM78, CM76, CM87, CM67. This gives the page unique, local context instead of a generic solar snapshot.

No fresh PSKReporter paths are cached for the immediate CM77 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

No contest event is currently loaded. For planning from CM77, start with 10m EXCELLENT, 15m EXCELLENT, 20m GOOD and keep 20m available as the safest all-around fallback.

Open contest calendar

Nearby grids